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• 25 year old kalari fighter
• 5 yrs experience
• Moved into county level this year:• Increased number of bouts (12)
• Signs of fatigue; unable to sustain high levels of speed strength required
Scenario/ Background
So…why?
Fatigue
Musculoskeletal structure & function
Fibre typesEnzymes
Central
Peripheral
RPE & Psychological factors
O2 availability
• Perform exercise protocol that will enable us to quantify levels of fatigue.
• Identify physiological, psychological and environmental factors that contribute to development of fatigue.
• Make recommendations related to findings and scenario.
What can we do?
• Analysis: Isokinetic dynamometer
• 90° isometric leg contraction• Electrical stimulation twitch
applied
What we did: Protocol
• Sustained 50% (of 1 RM) leg extension until exhaustion
• 30 secs rest at failure
• Repetition of 50% contraction
• End when Vinod unable to lift weight
Fatiguing process
Nm % of fatigue (due to central or peripheral)
Loss of MVC 60.7 100% (both combined)If activation remained 28.15 46.37%Loss due to activation 32.55 53.63%
Fresh FatigueMVC 245Nm 184.3NmSI twitch 1.6Nm 8.6NmResting twitch 55.9Nm 49.3NmCAR 99.35% 95.54%ITT 97.14% 82.55%Max. potential contraction
252.22Nm 223.24Nm
If activation remained 216.85Nm
Results
•Very high utilization (ITT )/activation of MVC
•Reduction in MVC ~25% when fatigued
•Implications/recommendations for athlete and trainer:
2 key areas• 1) Recovery• 2) Training
What to take from this?
Improving performance & Reducingfatigue: Recovery strategies
Performance
(Adapted from Calder, 2003)(Gandevia, 2001)
Psychological
Fatigue
Musculoskeletal structure & function
Environmental
Neural fatigue
Metabolic fatigue
• Progressive resistance training• Speed strength, power
• Combat factors analysed • early onset of fatigue,
inability to sustain high levels of performance for longer duration
Type of treatment
• Principles of training
• Prescription: • Frequency, intensity,
duration, type
• Ways of increasing load
• Periodisation• Tapering
Progressive overload
Resistance training
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