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Sweating response in physically trained men to sustained handgrip exercise in mildly hyperthermic conditions
S Yanagimoto1, K Aoki, N Horikawa
1Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University, 3-11 Tsurukabuto, Nada-ku, Kobe 657-8501, Japan.
Acta Physiologica Scandinavica
|February 20, 2002
Summary
Physical training enhances the body's sweating response to exercise, particularly on the limbs. This improved heat loss mechanism is linked to non-thermal factors during physical exertion.
Area of Science:
- Exercise Physiology
- Thermoregulation
- Human Performance
Background:
- Physical training influences physiological responses to exercise.
- Understanding heat loss mechanisms is crucial for performance and safety.
- Non-thermal factors can modulate sweating during exercise.
Purpose of the Study:
- To investigate how physical training affects heat loss via sweating during isometric handgrip exercise.
- To compare sweating responses in trained versus untrained individuals under controlled hyperthermia.
Main Methods:
- Seven trained and seven untrained males performed isometric handgrip exercises at varying intensities (20-50% MVC).
- Experiments were conducted in a climatic chamber (35°C, 50% RH) to induce mild hyperthermia.
- Sweating rate (SR) and thermal factors (skin/core temperature) were measured.
Main Results:
- Sweating rate on limbs was significantly higher in trained subjects at 50% MVC.
- The relationship between increased SR and exercise intensity was steeper in trained individuals for both trunk and limbs.
- Core and skin temperatures remained constant, indicating a focus on non-thermal sweating responses.
Conclusions:
- Physical training enhances sweating response to non-thermal exercise stimuli.
- This enhanced thermoregulatory response may be more pronounced on the limbs than the trunk.
- Improved sweating efficiency contributes to better heat dissipation in physically trained individuals.