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Related Experiment Videos

Heat shock does not attenuate low-frequency fatigue.

J A Thomas1, E G Noble

  • 1School of Kinesiology, The University of Western Ontario, London, Canada.

Canadian Journal of Physiology and Pharmacology
|October 27, 1999
PubMed
Summary

Heat shock does not improve skeletal muscle function during fatigue. Studies show heat shock protein (HSP72) levels increase, but muscle contractility and fatigue resistance remain unchanged. Recovery was even delayed.

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Area of Science:

  • Physiology
  • Exercise Physiology
  • Muscle Biology

Background:

  • Whole-body hyperthermia (heat shock) protects heart muscle from injury.
  • The protective effects of heat shock on skeletal muscle fatigue are not well understood.

Purpose of the Study:

  • To investigate if heat shock protects skeletal muscle contractility against low-frequency fatigue.
  • To determine if heat shock preconditioning enhances skeletal muscle performance during fatiguing conditions.

Main Methods:

  • Male Sprague-Dawley rats were subjected to heat shock (41.5°C for 15 min) 24 hours or 4 days before fatiguing stimulation.
  • Contractile properties of the plantaris muscle were measured before and after fatigue.
  • Levels of 72-kDa heat shock protein (HSP72) were assessed post-heat shock.

Main Results:

  • HSP72 levels were elevated in heat-shocked rats compared to controls at both 24 hours and 4 days.
  • No significant differences were observed in pre-fatigue contractility or fatigue resistance between heat-shocked and control groups.
  • Heat shock preconditioning did not improve post-fatigue force recovery and actually delayed it.

Conclusions:

  • Heat shock preconditioning does not enhance skeletal muscle contractile performance during low-frequency fatigue.
  • The findings do not support the use of heat shock therapy for improving skeletal muscle function under fatiguing conditions.

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