basic x fizz march 2011
TRANSCRIPT
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Doug Stacey MSc, BHScPT
Sport Physiotherapist – Dip.
Fowler-Kennedy Sport Medicine Clinic
Applied Exercise Physiology for the
Sport Therapist
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Objectives
Energy Systems
Assessing Sport Specific Demands
Periodization
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Review of Energy Systems
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ATP: The “Common Intermediate” in Energy Transfer
PPP
Adenosine Triphosphate (ATP)
Ribose(sugar)
Adenine
Adenosine
AMP
ADP
“high energy phosphates”
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ATP + H2O ADP + Pi + H+
ATPase
Myosin ATPase Ca 2+ ATPase Na+/K+ ATPase
“Demand”
“Supply”
Phosphagen Stores
Glycolysis Oxidative Phosphorylation
~70% ~30% ≤1%
Energy
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It is all about Resynthesis!!!!!
or…..
Cell Recovery
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Sarcolemma
Cytosol
Phosphagen
Glycolytic
Oxidative
Mitochondrion
+O2
ATP
ADP
1 rxn
10 rxns
>10 rxns
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Time
Rat
e of
AT
P P
rodu
ctio
n Phosphagen
Glycolytic
Oxidative
Energy “Systems”: Relative Rates of ATP Resynthesis
(CHO)
(lipid)
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Phosphagen System
PCr + ADP ATP + Cr
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When do we rely on phosphagen system?
• “Rest-to-work” transition
• Transitions in workload during exercise
• Anytime very high rates of ATP production are required
• Predominates during intense exercise lasting <10 s
• sprinting, throwing, jumping, weightlifting
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ATP + H2O ADP + Pi + Energy
Phosphagen System: Role of Phosphocreatine (PCr)
Creatine kinase
PCr serves as immediate energy “buffer”
ATP:
PCr: creatine P~
adenosine P P P~ ~
PCr + ADP ATP + Cr
rapid close
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Glycolytic System
Glucose + 2ADP + 2Pi 2 La + 2 H+ + 2 ATP
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When do we rely on “glycolytic system”?
• Required for high rates of ATP production
• 400m race, hockey shifts, interval work
≈ “anaerobic glycolysis”
≈ glycogen-to-lactate
≈ “lactic acid system”
• Predominates during heavy exercise lasting ~10-120 sec
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Glycolytic System:
“Glycolysis”: breakdown of 1 molecule of glucose to form 2 molecules of pyruvate
“Glycogenolysis”: removal of 1 “glucose unit” from glycogen to form 1 molecule of G 1-P
glucose (blood) glucose (6 C)
2 x pyruvate (3 C)
G 6-P G 1-P
glycogen (muscle)
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What is the fate of pyruvate?
glucose / glycogen
pyruvate
NAD
NADH
(mitochondria)
NADH
NAD
H+ + e-
O2
lactate
LDH
acetyl CoAPDH
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What’s the problem with increased lactate?
“ Lactic Acid ” H+ + Lactate –
muscle pH
“Metabolic inhibition”
( enzyme activity)
“Contractile inhibition”
( X-bridge cycling )
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Oxidative System
NADH + 3ADP + 3Pi + H+ + ½ O2 NAD + H2O + 3 ATP
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When do we rely on “oxidative system”?
• Predominates during exercise lasting > ~2 min
• Permits “moderate” rates of ATP provision
• Higher yield of ATP per unit of “substrate”
e.g., CHO: 1 molecule of glucose (6C):
• 2 ATP from glycolytic system
• 36 ATP from oxidative system!
• e.g. FAT: 1 molecule of palmitate (16 C):
• 129 ATP from oxidative system!
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AA FAGlu
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Summary of Energy Systems
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Glu / Glyc Lactate
Glu / Glyc CO2, H2O
Phosphagen
Glycolytic
Oxidative (CHO)
Oxidative (FAT)
2 / 3
36 / 38
~ 129FA / TG CO2, H2O
~ 5
~ 2.5
~ 1.5
PCr Cr 1~ 10 ≤ 10 sec
≤ 90 sec
~ 90 min
days
System Summary of Overall Reaction
ATP / “unit” substrate
(i.e., 1 mol)
Rate of ATP yield
“Usable” storage capacity
POWER
SPEED
ENDURANCE
ENDURANCE
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Energy Systems: Relative Contribution at Maximal Exercise
10 30 60 2 5 10 30 60+
seconds minutes
90 80 70 50 20 10 5 1
Oxidative
Non-Oxid.
10 20 30 50 80 90 95 99
%
Oxidative
Phosphagen
Glycolytic
2 5 10 30 60 120
80 55 40 10 5 <1
20 40 50 70 60 50
<1 5 10 20 30 50
seconds
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Elite Running Performance*: Relative Energy Contribution
Distance Duration (min:s) % Aerobic %Anaerobic
100 m 9.79 10 90
400 m 43.18 30 70
800 m 1:41:11 60 40
1500 m 3:26:00 80 20
5000 m 12:39.36 95 5
10000 m 26:22.75 97 3
42.2 km 2:05:42 99 1
* men’s outdoor world records as of 21-Sept-00
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Take Home Points: Energy SystemsEnergy
Systems Names
Phosphagen:Anaerobic
Alactic
Glycolytic:Anaerobic
Lactic
Oxidative:Aerobic
1. Energy source
*ATP-CP Carbohydrate*(Stored muscle glycogen and glucose)
*Carbohydrate and fats
2. End products of fuel breakdown
ADP and P in-organic, and C (Creatine)
*Lactic Acid CO2 and H2O
3. Muscle fibre types recrutied
*Fast and Slow Twitch
Fast Twitch (predominant)
Slow Twitch & * Fast Oxidative Glycolytic (FOG) fibre
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Take Home Points: Energy Systems (cont’d)
Energy Systems Names
Anaerobic Alactic
Anaerobic Lactic
Aerobic
4. Power (work per unit time) Output
High Medium Low
5. Time to fatigue 10 sec. *2 min. Long duration
6. % Utilization Energy System for Maximal Exercise of :10 sec.30 sec.2 min.10 min.
501541
3565469
15205090
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Assessing Sport Specific Energy
Demands
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Assessing Sport Specific Demands: Sport Analysis
1. Physical Requirements
2. Sport Analysis
3. Physiological Analysis
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Assessing Sport Specific Demands: Sport Analysis
10 30 60 2 5 10 30 60+seconds minutes
90 80 70 50 20 10 5 1
Oxidative
Non-Oxid.
10 20 30 50 80 90 95 99
%
Oxidative
Phosphagen
Glycolytic
2 5 10 30 60 120
80 55 40 10 5 <1
20 40 50 70 60 50
<1 5 10 20 30 50
seconds
1. Physical Requirements– Energy Systems
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Assessing Sport Specific Demands: Sport Analysis
1. Physical Requirements– Strength
Hypertrophy
Strength
Power
Endurance
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Assessing Sport Specific Demands: Sport Analysis
1. Physical Requirements– Flexibility
Static
Dynamic
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Assessing Sport Specific Demands: Sport Analysis
1. Physical Requirements– Physical Characteristics
Neuromuscular Control
Dynamic Stability
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Assessing Sport Specific Demands: Sport Analysis
2. Time Motion Analysis
– Temporal analysis of energy systems
A) performance time indicates energy system(s) involved– (Track, rowing, cycling, speed skating, swimming – some
pause phase!)
B) intermittent exercise– Analysis of intermittent schedules– calculations/interpretations (E:P ratio)– Velocity, number of reps, total distances– Mimic in practice
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Squasha) Analysis
intermittent exercise time/motion analysis (from Gilliam et al., in 7 male 6 female elite- 103 games)
– E:P of 3:1– Lat: 15, For: 9, Back: 6, Lunge: 1
physiological profiles– VO2max – 84%, MHR – 91%, La: 2.9
b) Training
aerobic VO2max and “maintenance of peak power” - i.e. sustained highest “aerobic” = anaerobic threshold fast twitch fibreperipheral, muscle specificitynot anaerobic glycolysis
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Assessing Sport Specific Demands: Sport Analysis
3. Physiological Analysis
– LABAerobic Power - VO2max/peak
Anaerobic Power - Wingate – peak/mean power
Strength
% Body Fat
Max blood lactate
Flexibility
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Assessing Sport Specific Demands: Sport Analysis
3. Physiological Analysis
– Field TestsAerobic Power -“Beep Test” – 20m shuttle
Anaerobic Power -Alactic – “jump and reach”
- “40 m dash”
-Lactic – “400m run”
- “30s activity”
Strength -push-ups, pull-ups – multi-joint mvts
Flexibility -static, dynamic, ROM
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Take Home Points: Sport Analysis
Know your energy systems: What are their relative contributions at maximal exercise?
What is the “weakest link” or limiting factor for the sport/exercise?
What are the sport specific demands?1. Physical Requirements – strength, flexibility, neuromuscular control
2. Time Motion Analysis – intermittent schedules, reps, intensity
3. Physiological Analysis – Lab and field testing for aerobic/anaerobic power
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Group Discussion
What is your sport - position/event?
What Energy Systems are used?
What are the Physical Demands?Strength
Flexibility
Neuromuscular control
Design a Field Test for your athlete
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Periodization
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Periodization
Systematically varying volume and intensity effective for long-term progression
Periodization to optimize both performance and recovery
– Classic (linear) model of periodization – high initial training volume and low intensity – hypertrophy, then increased intensity, decreased volume – strength
– Non-periodized training effective in short-term but variation (periodized) better in long term
– Undulating (nonlinear) periodization – variation of intensity and volume within 7-10 day cycles (e.g. day 1 3-5RM loads = strength; day 2 8-10RM loads = power; day3 12 –15RM loads = endurance)
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Concept of “Periodization” and “Peaking”
Classical Model
Bompa, 1999.
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How to Train Based on Duration of Activity
Bompa, 2005
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ZONE
Type of training
Duration # of reps
Rest Ratio % of max. intensity
1 Alactic 4-12 s 10-30
2-5 min
1:6 >95
2 Lactic 30-90 s 6-10 1-5 min
1:2-4 85-95
3 Max O2 consumption
3-5 min 8-12 2-3 min
4:1 80-85
4 Anaerobic Threshold
2-7 min 4-8 < 5min 1:1 65-80
5 Aerobic threshold
10min-2 hr
1-6 2-3 min
2:1 60
6 Aerobic Compensation
45 min-2hr
1-2 2-5 min
10:1 40-50
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Work:Rest Ratios
Load % Speed of performance
Rest Interval
Applicability
>105 Slow 4-5 mins Max strength and muscle tone
80-100 Slow-medium
3-5 As above
60-80 Slow-medium
2 Muscle Hypertrophy
50-80 Fast 4-5 Power
30-50 Slow-medium
1-2 Muscle endurance
Bompa, 2005
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Repetitions vs. % 1 RM
1 5 10 20 30 40 50 60 100 150 200# of Repetitions
100
80
605040
20
%1RM
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Questions???