therapeutic techniques to improve balance in neurological and developmental conditions
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University of the Philippines Manila College of Allied Medical Professions PT 154: Therapeutic Exercise III Ms. Mary Grace M. Jordan, PTRP December 8, 2009. Therapeutic techniques to improve balance in neurological and developmental conditions. Balance deficits…. - PowerPoint PPT PresentationTRANSCRIPT
University of the Philippines ManilaCollege of Allied Medical ProfessionsPT 154: Therapeutic Exercise IIIMs. Mary Grace M. Jordan, PTRPDecember 8, 2009
one of the most common problems treated by physical therapists.
are thought to be common after stroke, and they have been implicated in the poor recovery of activities of daily living (ADL) and mobility and an increased risk of falls.
Define balance Define terminologies Discuss the theoretical underpinnings of
balance Discuss the guidelines for training
balance in neurologic and developmental conditions
Identify techniques that can address impairments of balance in patients with neurologic and developmental conditions
“…the ability to maintain the body’s center of gravity over its base of support with minimal sway or maximal steadiness.”(Emery et.al, 2005)
a complex process involving the reception and organization of sensory inputs and the planning & execution of movement to achieve a goal requiring upright posture
is the set of functions which maintains man’s upright during stance and locomotion by detecting and correcting displacement of the line of gravity beyond the BOS.
Postural control – involves controlling the body’s position in space for the dual purposes of stability and orientation.
Postural orientation –The control of relative positions of the body parts by skeletal muscles with respect to gravity and each other.
Postural stability - The condition in which all the forces acting on the body are balanced such that the center of mass (COM)is with in the stability limits or boundaries of BOS
Normal anterior/posterior sway – 12 degrees from most posterior-anterior position.
Lateral sway - 16 degrees from side to side.If sway exceeds boundaries, compensation is
employed to regain balance.
Static balance - the base of support (BOS) remains stationary and only the body center of mass (COM) moves. The balance task in this case is to maintain the COM within the BOS or the limit of stability (the maximal estimated sway angle of the COM).
Maintaining a stable antigravity position while at rest such as when standing and sitting
Automatic postural reactions - maintaining
balance in response to unexpected external perturbations, such as standing on a bus that suddenly accelerates forward.
Dynamic balance - Maintaining balance when a person is moving from point A to point B, where both the BOS and COM are moving, and the COM is never kept within the BOS.
is stabilizing the body when the support surface is moving or when the body is moving on a stable surface such as sit-to-stand transfers or walking
• Reactive control - in response to external forces (perturbation).
• Proactive control – in anticipation of internal forces imposed on the body’s own movements.
Balance control is very complex and involves many different underlying systems.
Postural control results from a set of interacting systems that work cooperatively to control both orientation and stability of the body.
BALANCE
Anticipatory Mechanisms
(internal)
Proactive Mechanisms
(external)
ReactiveMechanisms
Sensory Systems
Body Schema
Neuro-muscular Synergies
Musculo-skeletal
Components
Joint range of motionSpinal flexibilityMuscle propertiesBiomechanical relationships among
linked body segments
Motor processes (neuromuscular response synergies)
Sensory processes ( visual, vestibular, and somatosensory systems)
Higher-level integrative processes • Mapping sensation to action• Ensuring anticipatory and adaptive aspects of
postural control
ADAPTIVE POSTURAL CONTROL
Involves modifying sensory and motor systems in response to changing task and environmental demands
ANTICIPATORY POSTURAL CONTROL
Involves preparing the sensory and motor systems for postural demands based on previous experience and learning
Minimize the effect of gravitational forces, which tend to pull us off center
The ideal alignment in stance allows the body to be maintained in equilibrium with the least expenditure of internal energy.
STANDING ALIGNMENT
Head balanced on level shoulders
Upper body erect, shoulders over hips
Hips in front of ankles Feet a few cm (10 cm)
apart
SITTING ALIGNMENT
Head balanced on level shoulders
Upper body erect Shoulders over hips Feet and knees a few
cm apart
The force with which a muscle resists being lengthened (Basmajian and De Luca, 1985)
Keeps the body from collapsing in response to the pull of gravity
Increased level of activity in antigravity muscles
Activation of antigravity muscles during quiet stance.
Muscles that are tonically active during quiet stance: gastrocsoleus, tibialis anterior, gluteus medius, TFL, iliopsoas, and erector spinae
Used when displacements are small. Displaces COG by rotation about the ankle joint. Posterior displacement of COG – Dorsiflexion at
ankle, contraction of anterior tibialis, quadriceps, abdominals.
Anterior COG displacement – Plantar flexion at ankle, contraction of gastrocnemius, hamstring, trunk extensors.
Employed when ankle motion is limited, displacement is greater, when standing on unstable surface that disallows ankle strategy.
Preferred when perturbation is rapid and near limits of stability.
Post. Displacement COG – Backward sway, activation of hamstring and paraspinals.
Ant Displacement COG – Forward sway, activation of abdominal and quadricep muscles.
The maintenance of balance is based on an intrinsic cooperation between the Vestibular system Proprioceptive Vision
Postural control does not only depends on the integrity of the systems but also on the sensory integration with in the CNS, visual and spatial perception, effective muscle strength and joint flexibility
Provides information regarding:(1) The position of the head relative to the
environment; (2) The orientation of the head to maintain level
gaze; (3) The direction and speed of head movements
because as your head moves, surrounding objects move in the opposite direction.
Provide a reference for verticality Visual stimuli can be used to improve a person’s
stability when proprioceptive or vestibular inputs are unreliable by fixating the gaze on an object.
Since most individuals can keep their balance when vision is occluded
In addition, visual inputs are not always an accurate source of orientation information about self-motion.
Visual system has difficulty distinguishing between object motion, referred to as exocentric motion, and self-motion, referred to as egocentric motion.
Provides the CNS with position and motion information about the body with reference to supporting surfaces
Report information about the relationship of body segments to one another
Receptors: muscle spindles, Golgi tendon organs, joint receptors, and cutaneous mechanoreceptors
A powerful source of information for postural control
Provides the CNS with information about the position and movement of the head with respect to gravity and inertial forces, providing a gravitoinertial frame of reference.
Distinguish exocentric and egocentric motions
SEMICIRCULAR CANAL
Sense angular acceleration of the head
Sensitive to fast head movements ( those that occur during gait or imbalance such as slips, trips, and stumbles)
OTOLITH ORGANS
Signal linear position and acceleration
Source of information about head position with respect to gravity
Respond to slow head movements (those that occur during postural sway)
Vestibular, visual, and somatosensory inputs are normally combined seamlessly to produce our sense of orientation and movement.
Incoming sensory information is integrated
and processed in the cerebellum, basal ganglia, and supplementary motor area.
Somatosensory information has the fastest processing time for rapid responses, followed by visual and vestibular inputs
When sensory inputs from one system are inaccurate the CNS must suppress the inaccurate input and select and combine the appropriate sensory inputs from the other two systems.
Injury to or diseases of the structures (e.g. eyes, inner ear, peripheral receptors, spinal cord, cerebellum, basal ganglia, cerebrum)
Damage to Proprioceptors
Injury to or pathology of hip, knee, ankle, and back have been associated with increases postural sway and decreased balance
Lesions produced by tumor , CVA, or other insults that often produced visual field losses
Patients with muscle weakness and poor control lack effective anticipatory, ongoing, and reactive postural adjustments and therefore experience difficulty in: Supporting the body mass over the paretic
lower limb Voluntarily moving the body mass from one
lower limb to another Responding rapidly to predicted and
unpredicted threats to balance
Stiffening the body with altered segmental alignment Moving slowly Changing segmental alignment to avoid large shifts
in COG standing reaching forward - flexing at hips
instead of dorsiflexing ankles standing reaching sideways - flexing trunk
sideways instead of moving body laterally at hips and feet
sitting reaching sideways - flexing forward instead of to the side
in standing - not taking a step when necessary.
Balance cannot be trained in isolation from the actions which must be relearned.
▪ In training walking, standing up and sitting down, reaching and manipulation… postural adjustments are also trained, since acquiring skill involves in large part the fine tuning of postural and balance control.
Postural adjustments are specific to each action and the conditions under which it occurs. It cannot be assumed that practice of
one action will transfer automatically into improved performance in another.
Progressive complexity is added by increasing the difficulty under which goals must be achieved, keeping in mind the various complex situations in which the patients will find themselves in the environment in which they live, both inside and outside their homes, and the precarious nature of balance.
As control over balance and confidence improves, tasks are introduced which require a stepping response, and responses to external constraints such as catching a thrown object and standing on a moving support surface
Use a gait belt any time the patient practices exercises or activities that challenge or destabilize balance.
Stand slightly behind and to the side of the patient with one arm holding or near the gait belt and the other arm on or near the top of the shoulder (on the trunk, not the arm).
Perform exercises near a railing or in parallel bars to allow patient to grab when necessary.
Do not perform exercises near sharp edges of equipment or objects.
Have one person in front and one behind when working with patients at high risk of falling or during activities that pose a high risk of injury.
Check equipment to ensure that it is operating correctly.
Guard patient when getting on and off equipment (such as treadmills and stationary bikes).
Ensure that the floor is clean and free of debris.
A variety of mode can be used to treat balance impairment
Begin with weight shifts on a stable surface
Gradually increase swayIncrease surface challenges (mini-tramp, etc.)
Rehabilitation balls ,foam rollers ,foam surfaces are often used to
• Provide uneven or unstable surface for exercise
• Sitting balance ,trunk stability, and weight distribution can be trained on a chair, table, or therapeutic ball
Pool is an ideal palace for training balance
Awareness of posture and the position of the body in space is fundamental to balance trainingBegin in supine or seated positionOver sessions, use a variety of arm positions,unstable surfaces, single leg stances, etc.Training both Static posture & Dynamic
posture Mirrors can provide postural feedback –Visual
feedback
Adding movement patterns to acquired stable static postures increases balance challenge.
Add ant./post. sway to increase stability limits
Trunk rotations and altered head positions alter vestibular input.
Stepping back/forward assists in re-stabilization exercises.
From simple to complex involves• BOS – Advance from wide to narrow base• Posture – Stable to unstable posture (sway)• Visual – Closing of the eyes• COG – Greater disruption to elicit hip or stepping
strategy
Progress to more dynamic activities, unstable surfaces, and complex movement patterns
Frequency,intensity,and duration
Normal postural activity forms necessary background for normal movement and for functional skills
Flaccid stage – balance exercises in sitting
Stage of spasticity – practice symmetrical weight bearing in standing, weight shifting, bending of knees and hips
Analysis of task• Individual• Task• Environment
Practice of missing components • Strategy training• Impairment and strategy level
Practice of whole task• Functional level
Transference of learning
acute stage post-stroke Head and trunk movements Reaching actions
To progress: Increasing distance to be reached Varying speed Reducing thigh support Increasing object weight and size to involve both
upper limbs Adding an external timing constraint such as
catching or bouncing a ball
The following main aspects should be developed: Antigravity support or weight bearing on the
feet Postural fixation of the head on the trunk and
on the pelvis in the vertical Counterposing Control of anteroposterior weight shift of the
child’s COG Control of lateral sway from one foot to the
other. Tilt reactions in standing Saving from falling (strategies)
Training should check: Equal distribution of weight on each foot Correction of abnormal postures Building up of the child’s stability by
decreasing support Delay training in standing and walking if
the child is not ready Weight shift leading to stepping Training lateral sway Training on different surfaces
Define balance Define terminologies Discuss the theoretical underpinnings of
balance Discuss the guidelines for training
balance in neurologic and developmental conditions
Identify techniques that can address impairments of balance in patients with neurologic and developmental conditions
Read Kisner’s Chapter on Techniques to improve balance.
Read Shumway-cook’s Chapter on interventions for postural control impairments
Adler SA, Beckers D, & Buck M (1993). PNF in practice. Berlin, Springer-Verlag.
Carr JH & Shepherd RB (2003). Stroke rehabilitation: Guidelines for exercise and training to optimize motor skill. Edinburgh, Butterworth-Heinemann.
Davies PM (1985). Steps to follow: A guide to the treatment of adult hemiplegia. Berlin, Springer-Verlag.
Kisner C & Colby LA (2007). Therapeutic exercise: Foundations and techniques (5th ed). Philadelphia, F. A. Davis Company.
Levitt S (2004). Treatment of cerebral palsy and motor delay (4th ed). Singapore, McGraw-Hill Inc.
Sawner K & LaVigne J (1992). Brunnstrom’s Movement Therapy in hemiplegia: A Neurophysiological Approach (2nd ed). Philadelphia, J.B. Lippincott Company.
Shumway-Cook, A & Woollacott, M. (2001). Motor control: Theory and practical applications (2nd ed.). Philadelphia: Lippincott Williams & Wilkins.