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Effects of exercise intensity on the sweating response to a sustained static exercise
N Kondo1, H Tominaga, M Shibasaki
1Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University, Kobe 657-8501, Japan. kondo@kobe-u.ac.jp
Summary
Sweating rate (SR) increases with handgrip exercise intensity, driven by nonthermal factors. Forearm SR rises progressively, while palm SR plateaus, indicating site-specific responses to exercise intensity.
Area of Science:
- Physiology
- Exercise Science
- Thermoregulation
Background:
- The sweating response is crucial for thermoregulation.
- Understanding how exercise intensity affects sweating is important for exercise physiology.
Purpose of the Study:
- To investigate the relationship between sustained handgrip exercise intensity and the sweating response.
- To determine if nonthermal factors influence sweating during exercise.
Main Methods:
- Eight healthy males underwent controlled environmental conditions (35°C, 50% RH).
- Subjects performed isometric handgrip exercise at varying intensities (15-60% MVC).
- Sweating rate (SR) on the forearm and palm was measured.
Main Results:
- Forearm SR significantly increased with exercise intensity above 30% MVC.
- Palm SR significantly increased above 45% MVC.
- Forearm SR showed a progressive increase, while palm SR plateaued.
Conclusions:
- Increased sweating during handgrip exercise is primarily mediated by nonthermal factors.
- The magnitude of these nonthermal factors correlates with the sweating response.
- Site-specific differences in sweating patterns exist during sustained handgrip exercise.