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    IntegratedCore

    Training

    National Academy of Sports Medicine

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    Integrated Core Training

    Copyright 2008 National Academy of Sports Medicine

    Printed in the United States of America

    All rights reserved. Except for use in a review, the reproduction or utilization of this work in any form

    or any electronic, mechanical or other means, now known or hereafter invented, including xerography,

    photocopying and recording, and in any information-retrieval system is forbidden without the written

    permission of the National Academy of Sports Medicine.

    Distributed by:

    National Academy of Sports Medicine

    26632 Agoura RoadCalabasas, CA 91302

    800.460.NASM

    Facsimile: 818.878.9511

    http: www.nasm.org

    Author: Dr. Micheal Clark, DPT, MS, PES, CES

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    Integrated Core Training

    IntroductionTo stay on the cutting edge of research, science, and practical application, the health and fitness professional

    needs to follow a comprehensive, systematic, and integrated approach when training, reconditioning, or

    rehabilitating a client. In order to develop a comprehensive integrated training program, the health and

    fitness professional must fully understand the functional kinetic chain. An integrated training program

    is a comprehensive approach that strives to improve all the components necessary to achieve optimum

    performance (strength, balance, flexibility, endurance, and power). Since the core is where the human

    bodys center of gravity is located and where all movement begins1,2,3,4this chapter focuses on the funda-

    mental concepts of core stabilization, and how the health and fitness professional can design an effective

    and dynamic core stabilization program.5,6,7,8,9,10,11

    Section I: Core Stabilization Concepts

    Section II: Functional Anatomy of the Core

    Section III : Scientific Rationale for Core Stabilization Training

    Section IV: Guidelines for Core Stabilization Training

    Section V: Core Stabilization Training Program Design

    Section VI: Summary

    References

    Traditionally, training has focused on isolated, absolute strength gains in isolated muscles, utilizing single

    planes of motion. However, all functional activities are multi-planar and require acceleration, decelera-

    tion, and dynamic stabilization.10,11,12Movement may appear to be single-plane dominant, but the other

    planes need to be dynamically stabilized to allow for optimum neuromuscular efficiency.13Understanding

    that functional movements require a highly complex, integrated system enables the health and fitness

    professional to make a paradigm shift. The paradigm shift focuses on training the entire kinetic chain

    utilizing all planes of movement, while establishing high levels of functional strength and neuromuscular

    efficiency.3,14,15,16,17,18The paradigm shift also dictates that the health and fitness professional train force

    reduction, force production, and dynamic stabilization during all kinetic chain activities.9,19

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    Integrated Core Training

    A core stabilization training program (Figure 1) improves dynamic postural control, ensures appropriatemuscular balance and joint arthrokinematics around the lumbo-pelvic-hip complex (LPHC), and allows

    for the expression of dynamic functional strength and improved neuromuscular efficiency throughout the

    entire kinetic chain.9,10,13,14,15,17,18,19,20,21,22,23,24,25

    Figure 1: Benefits of Core Training

    1. Improve dynamic postural control

    2. Ensure appropriate muscular balance and joint arthrokinematics

    3. Allow for the expression of functional strength

    4. Provide intrinsic stability to the LPHC, which allows for optimum

    neuromuscular efficiency of the rest of the kinetic chain

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    Section I:Core Stabilization Concepts

    The core is defined as the LPHC.9,13There are twenty-nine muscles that attach to the LPHC.9,26,27,28An

    efficient core allows for the maintenance of optimum length-tension relationships of functional agonists

    and antagonists, which makes it possible for the body to maintain optimum force-couple relationships in

    the LPHC. Maintaining optimum length-tension relationships and force-couple relationships allows for the

    maintenance of optimum joint arthrokinematics in the LPHC during functional kinetic chain movements.18,25,29

    This provides optimum neuromuscular efficiency in the entire kinetic chain, and allows for optimum accel-

    eration, deceleration, and dynamic stabilization during integrated, dynamic movements.1,2,3,4,9,11,13,18,25,30

    The core operates as an integrated functional unit, enabling the entire kinetic chain to work synergistically

    to produce force, reduce force, and dynamically stabilize against abnormal force.13In an efficient state,

    each structural component distributes weight, absorbs force, and transfers ground reaction forces.13This

    integrated, interdependent system needs to be appropriately trained to enable it to function efficiently

    during dynamic activities.

    Many individuals have developed functional strength, power, neuromuscular control, and muscular endur-

    ance in specific muscles that enable them to perform functional activities.9,11,13,31However, few people

    develop the muscles required for spinal stabilization.30,31,32

    The bodys stabilization system has to functionoptimally to effectively utilize the strength, power, neuromuscular control, and muscular endurance that

    it has developed in its prime movers. If the extremity muscles are strong and the core is weak, there will

    not be enough force created to produce efficient movements. A weak core is a fundamental problem

    inherent to inefficient movement that leads to predictable patterns of injury.11,30,31,32

    The core musculature is an integral component of the protective mechanism that relieves the spine of

    deleterious forces that are inherent during functional activities.14A properly designed core stabilization

    training program helps an individual gain strength, neuromuscular control, power, and muscle endurance of

    the LPHC. This integrated approach facilitates balanced muscular functioning of the entire kinetic chain.13

    Greater neuromuscular control and stabilization strength provides a more biomechanically efficient posi-tion for the entire kinetic chain, and thereby allows optimum neuromuscular efficiency throughout the

    kinetic chain.

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    Neuromuscular efficiency is established by the appropriate combination of postural alignment (static/dynamic) and stability strength, which enables the body to decelerate gravity, ground reaction forces, and

    momentum.10,15,19If the neuromuscular system is not efficient, it will be unable to respond to the demands

    placed on it during functional activities.13As the efficiency of the neuromuscular system decreases, the

    ability of the kinetic chain to maintain appropriate forces and dynamic stabilization decreases significantly.

    This decreased neuromuscular efficiency leads to compensation and substitution patterns (synergistic

    dominance, altered reciprocal inhibition, arthrokinetic inhibition), as well as poor posture during functional

    activities.18,20,25This increases mechanical stress on the contractile and non-contractile tissue and leads to

    repetitive microtrauma, abnormal biomechanics, and injury.14,16,20,33

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    Section II:Functional Anatomyof the Core

    The traditional perception of muscles is that they work concentrically and predominantly in one plane of

    motion. However, in order to more effectively understand motion and design efficient training, recondi-

    tioning, and rehabilitation programs, it is imperative to view muscles functioning in all planes of motion

    and in the full contraction spectrum (eccentrically, stabilization, and concentrically). The following section

    will describe the isolated and integrated functions of the major muscles of the kinetic chain.

    27,28

    Lower Extremity Functional Anatomy

    The lower extremity musculature functions synergistically to stabilize the entire kinetic chain during func-

    tional movement patterns. The lower extremity also works synergistically to eccentrically decelerate and

    concentrically accelerate the entire kinetic chain during functional movement patterns.27,34

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    Hamstrings

    The traditional view of the hamstring is that it assists with hip extension and knee flexion. The integrated

    view is that it eccentrically decelerates knee extension, hip flexion, and internal rotation at heel strike,

    eccentrically decelerates iliosacral anterior rotation during functional movements, and dynamically stabi-

    lizes the LPHC during functional movement patterns.

    Figure 2: Hamstrings

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    Hip Abductors

    These include the gluteus medius, gluteus minimus, and tensor fascia latae. The traditional view is that the

    hip abductors abduct the femur. The integrated view is that the gluteus medius decelerates hip adduction

    and hip internal rotation, and the gluteus minimus and tensor fascia latae decelerate hip adduction. The

    tensor fascia latae also assists in decelerating hip extension and hip external rotation. The entire abductor

    complex works synergistically as the primary frontal-plane stabilizing mechanism (lateral sub-system).

    Figure 3: Hip Abductor Complex

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    Gluteus Maximus

    The traditional view is that the gluteus maximus produces hip extension and external rotation. The

    integrated view is that it eccentrically decelerates hip flexion, hip adduction, and hip internal rotation

    during stance phase, decelerates tibial internal rotation via the iliotibial band (ITB), assists in stabilizing

    the sacroiliac joint (SIJ) via the sacrotuberous ligament and the lateral knee via the ITB.

    Figure 4: Gluteus Maximus

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    Iliopsoas

    This consists of the iliacus, psoas major, and psoas minor. The traditional view is that the lliopsoas pro-

    duces hip flexion. The integrated view is that it eccentrically decelerates femoral internal rotation at heel

    strike, eccentrically decelerates hip extension, and assists in stabilizing the lumbar spine during functional

    movements.

    Figure 5: Iliopsoas

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    Core Functional Anatomy

    The core musculature functions synergistically to stabilize, eccentrically decelerate, and concentrically

    accelerate the entire kinetic chain during functional movement patterns.

    Erector Spinae

    This muscle includes the iliocostalis, longissimus, and spinalis. The traditional view is that the erector spinae

    extends the trunk. The integrated view is that it eccentrically decelerates flexion, rotation, and lateral

    flexion of the lumbar spine, and dynamically stabilizes the lumbar spine during functional movements.

    Figure 6: Erector Spinae

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    Abdominal Complex

    This includes the rectus abdominus, external oblique, internal oblique, and transverse abdominus (TVA).

    The traditional view of the abdominal complex is that it flexes and rotates the trunk. The integrated view

    is that the rectus abdominuseccentrically decelerates extension and rotation, dynamically stabilizes the

    LPHC, and concentrically flexes the spine. The external obliqueeccentrically decelerates extension and

    rotation, dynamically stabilizes the LPHC, and concentrically posteriorly rotates the pelvis, flexes the pelvis

    and produces contralateral rotation. The internal oblique

    eccentrically decelerates extension and rotation,

    dynamically stabilizes the LPHC, and concentrically produces flexion and ipsilateral rotation. And finally,

    the TVAworks primarily to dynamically stabilize the LPHC during functional movement patterns.

    Figure 7: Addominal Complex

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    Upper Extremity Functional AnatomyThe upper extremity musculature functions synergistically to stabilize, eccentrically decelerate and con-

    centrically accelerate the entire kinetic chain during functional movement patterns.

    Latissimus Dorsi

    The traditional view of the latissimus dorsi is that it adducts, extends, and internally rotates the humerus.

    The integrated view is that it eccentrically decelerates flexion, abduction, and external rotation of the

    upper extremity, assists in dynamic stabilization of the LPHC through the thoracolumbar fascia (TLF)

    mechanism, and functions as a bridge between the upper and lower extremity.

    Figure 8: Latissimus Dorsi

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    Current Concepts in Functional AnatomyIt has been proposed that there are two distinct yet interdependent muscular systems that enable our

    bodies to maintain proper stabilization and ensure efficient distribution of forces for the production of

    movement. Crisco and Panjabi12have suggested that muscles located more centrally to the spine provide

    intersegmental stability (support from vertebrae to vertebrae) while the more lateral muscles support

    the spine as a whole. Bergmark35has categorized these different systems with relation to the trunk into

    local and global muscular systems.

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    Joint Support System

    The Inner Unit (Local Muscular System): The local musculature or inner unit consists of muscles that

    are predominantly involved in joint support or stabilization.35,36Thus we have chosen to refer to the local

    muscles as joint support systems. It is important to note, however, that joint support systems are not

    confined to the spine and are evident in the peripheral joints as well.

    Joint support systems consist of muscles that are not movement specific, but provide stability to allow

    movement of a joint. They usually are located in proximity to the joint. They also have a broad spectrum

    of attachments to the joints passive elements that make them ideal for increasing joint stiffness and thus

    stability.36A common example of a peripheral joint support system is the rotator cuff for the glenohu-

    meral joint that provides dynamic stabilization for the humeral head in relation to the glenoid fossa during

    movement.37,38Other joint support systems include the posterior fibers of the gluteus medius and the

    external rotators of the hip that perform pelvo-femoral stabilization,39and the vastus medialis obliquus

    that provides patellar stabilization at the knee.40The joint support system of the core (LPHC) consists of

    muscles that either originate or insert (or both) into the lumbar spine.4The major muscles include the

    TVA, lumbar multifidus, internal oblique, diaphragm and the muscles of the pelvic floor.35,36,41This joint

    support system has also been referred to as the inner unit. 41

    Figure 9: Inner Unit

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    The Outer Unit (Global Muscular Systems): The global muscles (outer unit) are predominantly respon-sible for movement and consist of more superficial musculature that attaches from the pelvis to the rib cage

    and/or the lower extremities.35,36,41The major muscles include the rectus abdominis, external obliques,

    erector spinae, hamstrings, gluteus maximus, latissimus dorsi, adductors, hamstrings, and quadriceps. The

    outer unit muscles are predominantly larger and are associated with movement of the trunk and limbs and

    equalize external loads placed upon the body. They also are important because they transfer and absorb

    forces from the upper and lower extremities to the pelvis.36The outer unit musculature has been broken

    down and described as force couplesworking in four sub-systems.42,43,44,45These sub-systems include the

    deep longitudinal, posterior oblique, anterior oblique, and lateral sub-systems.This distinction allows for

    an easier description and review of functionalanatomy. Its crucial for health and fitness professionals to

    think of these sub-systems

    operating as an integrated functional unit. Remember, the

    central nervous

    system is designed to optimize the selection of musclesynergies, not isolated muscles.46,47,48,49

    Figure 10: Outer Unit

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    The Deep Longitudinal Sub-System (DLS): The major contributors to the DLS are the erector spi-nae, TLF, sacrotuberous ligament, and biceps femoris. Some experts suggest that the DLS provides one

    means of a reciprocal force transmission longitudinally from the trunk to the ground.42,45As illustrated in

    Figure 11, the long head of the biceps femoris attaches to the sacrotuberous ligament at the ischium. The

    sacrotuberous ligament in turn attaches from the ischium to the sacrum. The erector spinae attaches

    from the sacrum and ilium up to the ribs and cervical spine. Activation of the biceps femoris increases

    tension in the sacrotuberous ligament, which transmits force across the sacrum stabilizing the SIJ, and

    allows force transference up through the erector spinae to the upper body.42,45

    Figure 11: Deep Longitudinal Sub-System

    This transference of force is apparent during the normal gait. Prior to heel strike, the biceps femoris

    activates to eccentrically decelerate hip flexion and knee extension.50Just after heel strike, the biceps

    femoris is further loaded through the lower leg via inferior movement of the fibula.51,52This tension from

    the lower leg, up through the biceps femoris, into the sacrotuberous ligament and up the erector spinae

    creates a force that assists in stabilizing the SIJ.42,45

    Another force couple not mentioned in the DLS consists of the superficial erector spinae, the psoas and

    the inner unit. While the erector spinae and psoas create lumbar extension and an anterior shear force

    at L4S1, the inner unit provides inter-segmental stabilization and a posterior shear force (neutralizer)

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    during functional movement.28,36,41

    Dysfunction in any of these structures can lead to SIJ instability and lowback pain (LBP),45demonstrating the importance of training these structures as a functional unit.

    The Posterior Oblique Sub-System (POS): The POS works synergistically with the DLS. As illustrated

    in Figure 12, the gluteus maximus and latissimus dorsi attach to the TLF, which connects to the sacrum.

    The fiber arrangements of these muscles run perpendicular to the SIJ. Thus, when the contralateral glu-

    teus maximus and latissimus dorsi contract, they create a stabilizing force for the SIJ. 45Just prior to heel

    strike, the latissimus dorsi and the contralateral gluteus maximus are eccentrically loaded. At heel strike,

    each muscle accelerates (concentric action) its respective limb and creates tension in the TLF. This ten-

    sion assists in the stability of the SIJ. In addition, the POS transfers forces that are summated from the

    transverse plane orientation of these muscles to propulsion in the sagittal plane when we walk or run.The POS is also of prime importance for other rotational activities such as swinging a golf club, swinging

    a baseball bat, and/or throwing a ball.42,44,45Dysfunction of any structure in the POS can lead to SIJ insta-

    bility and LBP. The weakening of the gluteus maximus and/or latissimus dorsi may also lead to increased

    tension in the hamstring and therefore cause reoccurring hamstring strains.41,45,53

    Figure 12: Posterior Oblique Sub-System Image

    The Anterior Oblique Sub-System (AOS): The AOS also functions in a transverse plane orientation

    very similarly to the POS only from the anterior portion (front) of the body. Its prime contributors are

    the oblique muscles (internal and external) adductor complex, and hip external rotators. Viewing elec-

    tromyography (EMG) data on the obliques, adductors, and hip external rotators, it is apparent that they

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    function to aid in the stability and rotation of the pelvis, as well as contributing to leg swing.27,50

    The AOSis also implicated in the stabilization of the SIJ.54As illustrated in Figure 13, when we walk, our pelvis must

    rotate in the transverse plane in order to create a swinging motion for the legs. 42 This rotation comes in

    part from the POS posteriorly and the AOS anteriorly. One only needs to look at the fiber arrangements

    of the muscles involved (latissimus dorsi, gluteus maximus, internal and external obliques, adductors, and

    hip rotators) to realize this point. The AOS is also necessary for functional activities involving the trunk,

    upper and lower extremities. The obliques, in concert with the adductor complex, not only produce

    rotational and flexion movements, but also are instrumental in stabilizing the LPHC.44,54

    Figure 13: Anterior Oblique Sub-System Image

    The Lateral Sub-System (LS) : The LS is comprised of the gluteus medius, tensor fascia latae, adductor

    complex, and quadratus lumborum. The LS has been implicated in frontal plane stability.28,53This system

    is responsible for pelvo-femoral stability. Figure 14illustrates how, during single-leg functional movements

    such as in gait, lunges, or stair climbing, the ipsilateral gluteus medius, tensor fascia latae, and adductors

    combine with the contralateral quadratus lumborum to control the pelvis and femur in the frontal plane.28,53

    Dysfunction in the LS is evident by increased pronation (flexion, internal rotation and adduction) of the

    knee, hip and/or feet during walking, squats, lunges or climbing stairs. Accessory frontal plane movementduring gait is characterized by decreased strength and neuromuscular control in the LS.55,56Keep in mind

    that for reasons of explanation, these four sub-systems have been oversimplified and that the human

    body simultaneously utilizes all four of these sub-systems during activity. Each sub-system individually and

    interdependently contributes to the production of efficient movement by accelerating, decelerating, and

    dynamically stabilizing the kinetic chain during motion.

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    Figure 14: Lateral Sub-System

    All of these muscles play an integral role in the kinetic chain because they provide dynamic stabilization

    and optimum neuromuscular control of the entire LPHC. When isolated, these muscles do not effectively

    achieve stabilization of the LPHC. It is the synergistic, interdependent functioning of the entire LPHC that

    enhances the stability and neuromuscular control throughout the entire kinetic chain.

    Stabilization Mechanisms

    The LPHC is stabilized during integrated multi-planar movement by two primary systems, the tho-

    racolumbar stabilization mechanism and the intra-abdominal pressure stabilization mechanism (IAP)

    (Figure 15).1,2,3,4,30,31,32,57,58,59,60,61

    Figure 15: Stabilization Mechanisms

    m Thoracolumbar Stabilization

    m Intra-abdominal Pressure

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    Thoracolumbar Stabilization MechanismThe TLF is a fascial network of non-contractile tissue that plays an essential role in the functional stability

    of the lumbar spine. The TLF is divided into three layers, the posterior, anterior, and middle. Although the

    TLF is non-contractile, it can be engaged dynamically because of the contractile tissue that attaches to it .

    The muscles that attach to the TLF include deep erector spinae, multifidus, TA, internal oblique, gluteus

    maximus, latissimus dorsi, and quadratus lumborum. The TA and the internal oblique are particularly

    important for stabilization. They attach to the middle layer of the TLF via the lateral raphe. Contraction

    of the TA and the internal oblique creates a traction and tension force on the TLF, which enhances the

    regional inter-segmental stability in the LPHC. This preferential contraction decreases translational and

    rotational stress at the lumbosacral junction.30,31,32,60,62,63,64

    Figure 16: Thoracolumbar Stabilization Mechanism

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    Intra-abdominal Pressure MechanismThe second stabilization mechanism is the IAP.1,2,4,7,65Increased IAP decreases compressive forces in the

    LPHC. As the abdominal muscles contract against the viscera, they push superiorly into the diaphragm

    and inferiorly into the pelvic floor. This results in elevation of the diaphragm and contraction of pelvic

    floor musculature. This will assist in providing intrinsic stabilization to the LPHC.

    Figure 17: Intra-abdominal Pressure Mechanism

    Postural Considerations

    The core maintains postural alignment and dynamic postural equilibrium during functional activities.

    Optimum alignment of each body part is a cornerstone of an integrated training and rehabilitation pro-

    gram. Optimum posture and alignment allow for optimum neuromuscular efficiency because the normal

    length-tension relationship, force-couple relationship, and arthrokinematics are maintained during func-

    tional movement patterns.9,11,14,16,17,18,19,20,25,66,67,68,69A comprehensive core stabilization program prevents

    the development of serial distortion patterns and provides optimum dynamic postural control during

    functional movements.9,11,14,23,24

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    Neuromuscular ConsiderationsA strong and stable core can improve optimum neuromuscular efficiency by improving dynamic postural

    control.18,25,30,32,63,70,71Several authors have demonstrated kinetic chain imbalances in individuals with

    altered neuromuscular control.14,15,16,17,18,21,22,23,24,30,31,32,33,60,62,63,67,68,72,73,74,75,76 Research has demonstrated

    that people with LBP have an abnormal neuromotor response of the trunk stabilizers accompanying limb

    movement.31,32,76Additionally, individuals with LBP had significantly greater postural sway and decreased

    limits of stability. Research also demonstrates that approximately 75 to 90% of all individuals suffer from

    recurrent episodes of back pain. Furthermore, it has been demonstrated that individuals have decreased

    dynamic postural stability in the proximal stabilizers of the LPHC following lower extremity ligamentous

    injuries.14,72,73,74

    It has also been demonstrated that joint and ligamentous injury can lead to decreasedmuscle activity.20,29,77,78Joint and ligament injury can lead to joint effusion, which in turn leads to muscle

    inhibition.77This alters neuromuscular control in other segments of the kinetic chain secondary to altered

    proprioception and kinesthesia.72,73Therefore, when an individual has pain and swelling, all of the muscles

    that cross that joint can be inhibited.

    Research has also demonstrated that muscles can be inhibited from an arthrokinetic reflex.14,22,29,78This

    is referred to as arthrogenic muscle inhibition. Arthrokinetic reflexes are reflexes that are mediated by

    joint receptor activity. If an individual has abnormal arthrokinematics, the muscles that move the joint

    will be inhibited. For example, if an individual has a sacral torsion, the multifidus and the gluteus medius

    can be inhibited.79

    This leads to abnormal movement in the kinetic chain. The tensor fascia latae becomesynergistically dominant and become the primary frontal plane stabilizer. 28This often leads to tightness in

    the iliotibial band, which decreases frontal and transverse plane control at the knee. Furthermore, if the

    multifidus is inhibited,79the erector spinae and the psoas become facilitated. This will further inhibit the

    inner unit stabilization mechanism (internal oblique and TVA) and the gluteus maximus,31,32which also

    decreases frontal and transverse plane stability at the knee. As previously mentioned, an efficient core

    improves neuromuscular efficiency of the entire kinetic chain because it dynamically stabilizes the LPHC

    and therefore improves pelvo-femoral biomechanics. This is yet another reason that training programs

    should include a comprehensive core stabilization-training program to prevent injury as well as the chain

    reactions that are initiated secondary to injury in the kinetic chain.

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    Section III:Scientific Rationale forCore Stabilization Training

    Most individuals train their core stabilizers inadequately compared to other muscle groups.13Although

    adequate strength, power, muscle endurance, and neuromuscular control are important for lumbo-pel-

    vic-hip stabilization, it is detrimental to perform exercises incorrectly or that are too advanced. Several

    authors have found decreased firing of the TVA, internal oblique, multifidus, and deep erector spinae in

    individuals with chronic LBP.

    30,31,32,60,76,80

    Research has shown decreased stabilization endurance in individu-als with chronic LBP.1,2,5,81The core stabilizers are primarily type I slow-twitch muscle fibers.1,2,3,4These

    muscles respond best to time under tension. Time under tension is a method of contraction that lasts

    for 620 seconds and emphasizes hyper-contractions at end ranges of motion. This method improves

    intramuscular coordination, which improves static and dynamic stabilization. To get the appropriate train-

    ing stimulus, you must prescribe the appropriate speed of movement for all aspects of exercises.7,8Core

    strength endurance must be trained appropriately to allow an individual to maintain dynamic postural

    control for prolonged periods of time.65

    Performing core training with inhibition of these key stabilizers leads to the development of muscle imbal-

    ances and inefficient neuromuscular control in the kinetic chain. Research demonstrates that abdominaltraining without proper pelvic stabilization increases intradiscal pressure and compressive forces in the

    lumbar spine.5,30,31,32,60,65,82,83In fact, maintaining the cervical spine in a neutral position during core training

    will improve posture, muscle balance, and stabilization. If, for instance, the head protracts during move-

    ment, the sternocleidomastoid is preferentially recruited. This increases the compressive forces at the

    C0C1 vertebral junction. This can also lead to pelvic instability and muscle imbalances secondary to the

    pelvo-occular reflex. This reflex is important to maintain the eyes level.16,22 If the sternocleidomastoid

    muscle is hyperactive and extends the upper cervical spine, then the pelvis will rotate anteriorly to realign

    the eyes. This can lead to muscle imbalances and decreased pelvic stabilization.16,22

    Additional research demonstrates that hyperextension training without proper pelvic stabilization can

    increase intradiscal pressure to dangerous levels, cause buckling of the ligamentum flavum, and lead to

    narrowing of the intervertebral foramen.5,65,83Moreover, the traditional curl-up increases intradiscal pres-

    sure and increases compressive forces at L2L3.5,65,82,83

    Increasingly, research has uncovered decreased cross sectional area of the multifidi in subjects with LBP.79

    Researchers found that there was not spontaneous recovery of the multifidi following resolution of

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    symptoms.79

    Hence the need for adequate reconditioning of local, intrinsic core musculature. This needcan be addressed through implementing a training regimen that focuses on first creating core stabilization

    (increasing the endurance capacity of local core muscles) by retraining the local muscles with a drawing-in

    maneuver. Additional research demonstrates increased EMG activity and increased pelvic stabilization when

    an abdominal drawing-in maneuver was performed prior to initiating core training.5,6,8,60,61,62,63,65,70,84,85In

    fact, recent research by Hides et al. has shown that the technique of drawing-in significantly increased in

    the thickness of the TVA as well as decreased cross-sectional area, theorized to bilaterally contract and

    form a corset which will most likely increase the stability of the lumbar spine.86A study by Richardson

    et al. published in 2002 uncovered decreased joint laxity of the SIJ when a drawing-in maneuver (activat-

    ing the TVA with co-contraction of the multifidi) was performed.87This further supports the notion of

    increased core stability when the local core musculature is successfully engaged.

    The NASM Stance on Core Training Based on the Research

    It seems that much of the debate surrounding core training centers on theories of motor learning and

    muscle capacity, not on whether a core training program can help decrease LBP. In fact, many researchers

    agree on the integration of some aspect of core training to alleviate LBP in patients. A review of current

    core concepts and literature addressing the core revealed a shift in thought about the exercise and appli-

    cations of a lumbar stability program (LSP). A review published in theAmerican Journal of Physical Medicine

    and Rehabilitationprovided some insight into the highly debated and increasingly interesting research of

    LSPs. Despite every view, the review found a universal acceptance that exercise may be a vital part of

    treatment of nonspecific LBP.88The question most researchers are currently fixated on is what program

    implementation will work best.89

    There are various approaches to training the core. The rationale behind core training seems to fall into

    two main categories: the muscle capacity model, which states that exercises are performed because the

    demands of trunk control require a restoration of strength and endurance; and the control model, which

    states that exercises are performed to gain control and coordination of the trunk musculature.90

    The first rationale of muscle capacity is based on the Euler model of spinal stability. Eulers model equates

    the forces acting on a flexible column in order to control buckling forces. This model proposes that themusculature that surrounds the spine acts as guy wires to help support and stabilize the spine (i.e., stability

    is dependent on muscles acting to limit trunk motion). As Eulers theory suggests, devoid of musculature

    to stiffen the spine, compressive forces of as little as 90 Newtons (20.23 lbs) could cause the lumbar spine

    to buckle. This mode of thought asserts that these muscles keep the spine in a mechanically stable equi-

    librium (i.e., neutral spine). These muscles are proposed to control and restrict movement and maintain

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    a stable lumbo-pelvic position (bracing). However, this is a very static analysis of the spine, and theorieshave not been tested on a dynamic model. This exercise strategy would require a stable or stiff spine,

    with force and load being applied through movement of the extremities.

    In the control model of core stability, theorists claim that lumbo-pelvic function and health are dependent

    on the accurate interplay of the trunk musculature.90In other words, the nervous system must be able

    to determine how much stability the spine needs to meet the internal or external demands and recruit

    the proper muscles to handle those needs. Feed-forward control dictates that the nervous system can

    plan muscle-activation strategies in advance to prepare the spine to handle forces and loads resulting from

    movement of an extremity. If the forces are unexpected, the nervous system must be able to respond

    accurately and recruit the correct muscles to protect the spine from deleterious forces. Therefore, theo-rists claim that control of the lumbar spine and pelvis are dependent not only on muscle capacity, but also

    on the sensory system that communicates spinal stability, which allows the nervous system to respond

    accurately by choosing and implementing the correct muscle strategy.

    Studies have shown that people with LBP have changes in motor control. Research has found in LBP suf-

    ferers a delayed activity of the TVA and lumbar multifidi with quick movements of the extremities. 90,91

    Independent of force direction, the local musculature has been shown to be active and activated prior to

    movement in healthy participants. Hodges noted in his research that the TVA, when properly activated,

    creates tension in the TLF, contributing to spinal stiffness, and compresses the SIJ, increasing stability.91The

    lumbar multifidus, in conjunction with the TVA, can help control movement and translation of vertebraeby generating an intervertebral compressive force. The global system was found to have little ability to

    control the movement of the spine, yet it contributes spinal orientation and helps counter forces. Based

    on these findings, exercise recommendations or program considerations can vary, depending on whether

    the individual focus is on control or muscle capacity.

    Both strategies should be implemented in a core training program, as research has shown the need for both

    retraining motor control of local and global musculature as well as retraining the strength and endurance

    of these muscles. Research has upheld the hypothesis that proper function of both the local and global

    musculature is needed to maintain efficacy of the spine. For retraining control of core stability, retraining

    recruitment strategies of the Central Nervous System would be appropriate. In these cases, the intrinsicmusculature is not functioning appropriately and is often inhibited by the superficial musculature that has

    become synergistically dominant or hyperactive.

    A core program that incorporates skilled activation of the deep muscles and then progressive integration

    of the intrinsic musculature with the superficial musculature is necessary. Once the coordinated activation

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    is accomplished, training in varying environments, at differing speeds, forces, and intensities, is needed toshift an individual into activities of daily living. The muscle capacity model of core stability exercise tends

    to overlap the control model. The muscle capacity model is more aggressive in utilizing superficial trunk

    musculature right away, claiming the need for coordination of both groups of muscles to work together

    synergistically. In essence, this is a correct observation; however, devoid of proper initial training of the

    intrinsic musculature, continual dominance of the superficial muscles could result.

    In the end, both theories aim to re-establish the trunk muscles ability to meet the higher demands or

    forces placed on them for spinal stability, and the theories, used together, can be a significant approach

    to core stability training.

    NASM is continually stressing the integration of both theories of motor relearning and increased capacity

    of core muscles. The core stabilization training guidelines require activation and skilled learning of proper

    intrinsic muscle recruitment before integration of the superficial musculature.

    One starts with what is termed core stabilization training, where the neutral spine is located and retraining

    of the inner unit is accomplished. This creates increased lumbo-pelvic-hip stability through the co-contrac-

    tion of the TVA and the lumbar multifidi, as well as the TLF that is dynamically engaged through muscle

    insertions such as the TVA, deep erector spinae, internal obliques, and lumbar multifidi. This retraining

    also increases neuromuscular efficiency, leading to increased muscle capacity as the superficial muscles

    are introduced later in training. Performing exercises without proper firing of the inner unit musculature

    can lead to muscle imbalances and inefficient neuromuscular control of the entire kinetic chain. This, in

    turn, can lead to or propagate already existing injuries, such as LBP.

    As mentioned earlier, research has found that lack of proper stabilization leads to increased intradiscal

    pressure and compressive forces in the lumbar spine. Once skilled activation is accomplished, movement

    of the extremities is added while the client maintains a neutral spine, retraining muscle capacity as the

    extremities pose substantial force requirements on the spine. These exercises should be done without

    noticeable compensation before integration of superficial muscles into the exercises.

    The next level of core training integrates and coordinates activation of the deep musculature with the

    superficial muscles of the core. The core strength level of training in NASMs model is intended toenhance neuromuscular efficiency, create a multi-dimensional progression and teach control of eccentric,

    isometric, and concentric phases of core activity. Specificity, speed and neural demand are also increased

    in this phase. This coincides with both the motor control theory and the muscle capacity theory of core

    training. In the NASM core training continuum, both theories are utilized as progressions of one another

    and not as differing approaches.

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    Lastly, in the core power stage of training, core stabilization and strength are integrated into the specificactivity, as are speed and neural demand. The speed and forces utilized in this phase are comparable to

    those encountered in a clients return to his or her environment. This phase places a high demand on the

    coordinated activity of the core musculature as a whole. Each level of core training treats both theories of

    core training as valid, and integrates each approach into a systematic progression to restore and increase

    function of the core, while avoiding injury.

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    Section IV:Guidelines for CoreStabilization Training

    Focusing on assessing the local musculature and incorporating exercises that teach proper muscle activa-

    tion of the TVA and multifidi in patients lacking proper activation may help clinicians begin the process of

    rehabilitation. An important key to success in a core training program is the understanding of flexibility

    and muscle imbalances. Activation of local stabilization musculature is important; however, activation of

    these muscles alone may not bridge the gap into functional living. Integration of core stabilization andstrength training is important in keeping clients functioning properly. Teaching proper activation patterns

    and increasing the endurance capabilities of both local and global musculature may transition a client safely

    from training into everyday movements and activities.

    Prior to performing a comprehensive core stabilization program, each individual must undergo a compre-

    hensive kinetic chain assessment. All muscle imbalances and arthrokinematic deficits need to be corrected

    prior to initiating an aggressive core training program. A team approach is the best way to thoroughly

    assess each client. Find a competent health care professional in your community with whom you can

    establish a referral basis for comprehensive evaluations.

    As outlined in Figure 18, a comprehensive core stabilization training program should adhere to specific

    guidelines. It should be systematic, progressive, and functional. The program should emphasize the entire

    muscle contraction spectrum, focusing on force production (concentric contractions), force reduction

    (eccentric contractions), and dynamic stabilization (isometric contractions). The core stabilization program

    should begin in the most challenging environment the individual can control.

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    Figure 18: Core Training Guidelines and Program Variables

    CORE STABILIZATION TRAINING GUIDELINES

    1. Progressive

    2. Systematic

    3. Activity Specific

    4. Integrated

    5. Proprioceptively Challenging

    6. Based on Current Science

    PROGRAM VARIABLES

    1. Plane of motion

    2. Range of motion

    3. Loading parameters (physioball, ball,

    Bodyblades, power sports trainer,

    weight vest, dumbbell, tubing, etc.)

    4. Body position

    5. Amount of control

    6. Speed of execution

    7. Amount of feedback

    8. Duration (sets, reps, tempo, time

    under tension)

    9. Frequency

    As outlined in Figures 19 and 20, a progressive continuum of function that adheres to multi-modal loading

    parameters should be followed to systematically train the individual. The program should be manipulated

    regularly by changing any of the following variables: plane of motion, range of motion, loading parameters

    (physioball, ball, bodyblades, power sports trainer, weight vest, dumbbell, tubing, etc.), body position,

    amount of control, speed of execution, amount of feedback, duration (sets, reps, tempo, time under ten-

    sion), and frequency.5,6,7,8,9,10,11,13,15,17,18,19,60,61,62,63,71,74,80,83,84,85,92,93,94,95,96,97,98,99,100

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    Figure 19: Functional Continuum

    CORE STABILIZATION TRAINING; FUNCTIONAL CONTINUUM

    1. Multi-planar (3 planes of motion)

    2. Multi-dimensional

    3. Utilize the entire muscle contraction spectrum

    4. Utilize the entire contraction velocity spectrum

    5. Manipulate all acute training variables (sets, reps, intensity, rest intervals,

    frequency, duration)

    Figure 20: Multi-Modal Loading Parameters

    1. Stability Ball

    2. Cable (Free motion)

    3. Tubing

    4. Medicine Ball

    5. Power Balls

    6. Bodyblades

    7. Dumbbells

    8. Weight Vests

    When designing a core stabilization training program, the health and fitness professional should create

    a proprioceptively enriched environment and select the appropriate exercises to elicit a maximal train-

    ing response. As outlined in Figure 21, the exercises must be safe, be challenging, stress multiple planes,

    incorporate a multi-sensory environment, be derived from fundamental movement skills, and be activity

    specific.

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    Figure 21: Exercise Selection Criteria

    1. Safe

    2. Challenging

    3. Progressive

    4. Systematic (Integrated Functional Continuum)

    5. Proprioceptively Enriched

    6. Activity Specific

    The health and fitness professional should follow a progressive and integrated functional continuum like

    the one illustrated in Figure 22 to allow optimum adaptations.9,10,11,84

    Figure 22: Integrated Functional Continuum

    In addition, the health and fitness professional should follow an exercise progression continuum similar

    to the one outlined in Figure 23.

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    Figure 23: Exercise Progression Continuum

    m Slow to Fast

    m Simple to Complex

    m Known to Unknown

    m Stable to Unstable

    These concepts are critical for a proper exercise progression: slow to fast, simple to complex,known to unknown, low force to high force, static to dynamic, correct execution to increased reps/

    sets/intensity.7,8,9,10,11,84

    The goal of core training is to develop optimal levels of functional strength and dynamic stabilization. 5,13

    Neural adaptations become the focus of the program instead of striving for absolute strength gains.9,14,15,30,62

    Increasing proprioceptive demand by utilizing a multi-sensory, multi-modal environment becomes more

    important than increasing the external resistance. Quality of movement is stressed over quantity. The

    focus of the program must be on function.9,10,11

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    Section V:Core StabilizationTraining Program

    The following is an example of an integrated core training program. As mentioned earlier, the individual

    begins at the highest level at which he or she is able to maintain stability and optimum neuromuscular

    control. He/she is progressed through the program when he/she achieves mastery of the exercises in the

    previous level.1,2,5,6,7,8,9,10,11,13,14,15,17,19,30,34,60,62,65,71,74,83,92,93,94,99,100,101,102,103,104,105

    Figure 24: OPTModel

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    Core StabilizationIn core stabilization (phase 1 of the OPTmodel), exercises involve little motion through the spine and

    pelvis. These exercises are designed to improve the functional capacity of the stabilization system.

    Marching Prone Iso-Abs Side Iso Abs

    Iso Abs w/Hip Extension Floor Bridge 1 Floor Bridge 2

    Floor Cobra 1 Floor Cobra 2 Arm/Opposite Leg Raise

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    Core StrengthIn core strength training (phases 2, 3, and 4 of the OPTmodel), the exercises involve more dynamic

    eccentric and concentric movements of the spine through a full range of motion. The specificity, speed, and

    neural demand are also progressed in this level. These exercises are designed to improve dynamic stabiliza-

    tion, concentric strength, eccentric strength, and neuromuscular efficiency of the entire kinetic chain.

    Ball Crunch 1 Ball Crunch 2 Ball Crunch Ball Crunch

    w/Rotation 1 w/Rotation 2

    Back Extension 1 Back Extension 2 Reverse Crunch 1

    Reverse Crunch 2 Knee Ups 1 Knee Ups 2

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    Cable Lift 1 Cable Lift 2 Cable Chop 1 Cable Chop 2

    Core Power

    In core power training (phase 5 of the OPTmodel), exercises are designed to improve the rate of force

    production of the core musculature. These forms of exercise prepare an individual to dynamically stabilize

    and generate force at more functionally applicable speeds.

    Ball MB Pullover Throw 1 Ball MB Pullover Throw 2 Woodchop Throw 1 Woodchop Throw 2

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    MB Scoop Toss 1 MB Scoop Toss 2 Rotational Chest Rotational Chest

    Pass 1 Pass 2

    Integrated Core Training Program Design

    OPTLevel Phase Example Core Exercises Sets/Reps Rest

    Stabilization

    Strength

    Power

    1

    2, 3, 4

    5

    14 Core Stabilization

    2Leg Floor Bridge

    Prone Iso-Abs

    Prone Cobra

    *04 Core Strength

    Back Extensions

    Ball Crunches

    Cable PNF

    Knee-ups

    **02 Core Power

    Medicine Ball Rotational Chest Pass

    Ball Medicine Ball Pullover

    13 x 1220

    23 x 810

    24 x 510

    0 90 s

    0 60 s

    0 60 s

    Table 1 Integrated Core Training Program Design

    *For the goal of muscle hypertrophy and maximal strength, it may be optional (although recommended) for individuals.

    **Because core exercises are performed in the dynamic warm-up portion of this program and core power exercises are included

    in the resistance training portion of the program, separate core training may not be necessary in this phase of training.

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    Section VI:Summary

    This type of training should be included in all integrated training programs. A core training program enables

    an individual to gain optimum neuromuscular control of the LPHC and to achieve optimum performance.

    To choose the proper exercises when designing a program, follow the progression of the OPTmodel.

    In the stabilization level, choose one to four core stabilization exercises. In the strength level, select from

    zero to four core strength exercises. In the power level, pick from zero to two core power exercises.

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