Exercise intensity independently modulates thermal behavior during exercise recovery but not during exercise
Nicole T Vargas1, Christopher L Chapman1, Blair D Johnson1
1Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo , Buffalo, New York.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 18, 2019
Summary
High-intensity exercise increases thermal behavior due to greater afferent stimuli. However, the withdrawal of thermal behavior is augmented after high-intensity exercise, possibly due to reduced perception of these stimuli.
Area of Science:
- Exercise Physiology
- Thermoregulation
- Human Performance
Background:
- Understanding how exercise intensity affects the body's thermal regulation is crucial for optimizing performance and safety.
- Previous research has not specifically investigated the independent effects of exercise intensity on thermal behavior.
Purpose of the Study:
- To test the hypothesis that thermal behavior is greater during and after high-intensity exercise compared to moderate-intensity exercise.
- To investigate the relationship between afferent stimuli and thermal behavior across different exercise intensities.
Main Methods:
- 20 participants (10 women, 10 men) cycled at moderate (53% peak oxygen uptake) or high (78% peak oxygen uptake) intensity for 30 minutes in a controlled environment (27°C, 20% RH).
- Continuous recording of mean skin and core temperatures, mean skin wettedness, and neck device temperature (index of thermal behavior).
- Analysis of the relationship between afferent stimuli (weighted average of temperature and wettedness) and thermal behavior during exercise and recovery.
Main Results:
- Higher mean skin and core temperatures at the end of high-intensity exercise.
- Elevated core temperature persisted for 70 minutes into recovery following high-intensity exercise.
- Greater mean skin wettedness and afferent stimulus during high-intensity exercise, persisting into recovery.
- Lower neck device temperature (indicating greater thermal behavior) during high-intensity exercise.
- Strong correlation between afferent stimulus and thermal behavior, with steeper slope and higher intercept during recovery from high-intensity exercise.
Conclusions:
- Exercise intensity does not independently modulate thermal behavior during exercise; it depends on the magnitude of afferent stimuli.
- The withdrawal of thermal behavior is augmented after high-intensity exercise, potentially due to attenuated perceptual responses.
- This study provides novel insights into the intensity-dependent modulation of thermoregulation during and after exercise.
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