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Hyperthermia modifies the nonthermal contribution to postexercise heat loss responses
Daniel Gagnon1, Ollie Jay, Francis D Reardon
1School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.
Medicine and Science in Sports and Exercise
|April 2, 2008
Summary
Active and passive recovery enhance post-exercise heat loss compared to inactive recovery, with thermal control dominating early responses. Sex did not impact these recovery effects.
Area of Science:
- Exercise Physiology
- Thermoregulation
- Human Physiology
Background:
- Exercise-induced hyperthermia challenges the body's thermal balance.
- Understanding post-exercise recovery is crucial for physiological adaptation.
- Non-thermoregulatory factors may influence heat loss during recovery.
Purpose of the Study:
- To investigate non-thermoregulatory control of cutaneous vascular conductance (CVC) and sweating post-exercise.
- To examine sex-related differences in these recovery responses.
- To test if active/passive recovery attenuates mean arterial pressure (MAP) fall and affects CVC/sweat rate differently than inactive recovery.
Main Methods:
- Nine males and nine females underwent exercise-induced hyperthermia (esophageal temperature = 39.5°C).
- Participants then engaged in 60 minutes of active, inactive, or passive recovery.
- Cutaneous vascular conductance (CVC), sweat rate, and mean arterial pressure (MAP) were measured throughout recovery.
Main Results:
- Active and passive recovery elevated MAP compared to inactive recovery (P < 0.001).
- No initial differences in CVC (10 min) or sweat rate (50 min) were observed between recovery modes.
- Active and passive recovery showed greater CVC and sweat rate responses than inactive recovery later in the recovery period.
Conclusions:
- Non-thermal inputs influence post-exercise heat loss even with a strong thermal drive.
- Thermal control is dominant in the initial 10 minutes for CVC and 50 minutes for sweating.
- Recovery mode effects on heat loss and hemodynamics were consistent between sexes.
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