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Related Experiment Videos

Post-exercise thermal homeostasis as a function of changes in pre-exercise core temperature

G P Kenny1, G G Giesbrecht, J S Thoden

  • 1University of Ottawa, Faculty of Medicine, Department of Physiology, Canada.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1996
PubMed
Summary

Pre-exercise esophageal temperature (Tes) directly influences cutaneous vasodilation (Thdil) and post-exercise Tes elevation. Exercise-induced Thdil extends into recovery, impacting thermal recovery after exercise.

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Area of Science:

  • Exercise Physiology
  • Thermoregulation
  • Human Physiology

Background:

  • Previous research indicated a link between esophageal temperature (Tes) and cutaneous vasodilation (Thdil) during exercise.
  • The influence of pre-exercise Tes on post-exercise thermal recovery requires further investigation.

Purpose of the Study:

  • To test the hypothesis that pre-exercise Tes influences post-exercise Thdil and Tes elevation.
  • To examine the relationship between pre-exercise Tes and thermal responses during and after repeated exercise bouts.

Main Methods:

  • Nine healthy, young males underwent three cycles of treadmill exercise (70% VO2max) interspersed with rest.
  • Esophageal, rectal, and skin temperatures, along with forearm cutaneous blood flow, were continuously monitored.
  • Laser-Doppler flowmetry identified the precise timing of cutaneous vasodilation (Thdil) during exercise.

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Main Results:

  • Pre-exercise Tes was 36.74°C.
  • Post-exercise Tes showed significant elevations after each work bout (37.22°C, 37.37°C, 37.48°C).
  • Thdil during exercise correlated with and was not different from post-exercise Tes in the subsequent recovery period.

Conclusions:

  • Pre-exercise esophageal temperature directly influences cutaneous vasodilation and post-exercise thermal recovery.
  • The exercise-induced increase in cutaneous vasodilation persists into the recovery phase, affecting overall thermal regulation post-exercise.