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The topography of eccrine sweating in humans during exercise
J D Cotter1, M J Patterson, N A Taylor
1Department of Biomedical Science, University of Wollongong, NSW, Australia.
Summary
This study found that sweating onset on the lower torso occurs faster than on the head during exercise in heat. Steady-state sweating rates varied across body regions, challenging previous models of heat regulation.
Area of Science:
- Human Physiology
- Thermoregulation
- Exercise Physiology
Background:
- Understanding the distribution and onset of sweating is crucial for effective thermoregulation during exercise in heat.
- Previous research suggested a specific caudal-to-rostral (tail-to-head) sweat onset pattern during resting heat stress.
Purpose of the Study:
- To investigate the distribution and onset of steady-state sweating rates (msw) during strenuous exercise in a hot environment.
- To compare sweat onset times and steady-state sweating rates across various skin regions.
Main Methods:
- Six men underwent cycling trials at 40% peak power in 36.6°C heat.
- Steady-state sweating rates (msw) were measured using ventilated capsules on eleven skin surfaces.
- Auditory canal temperature (Tac) and skin temperatures were recorded; msw was normalized to the forehead response.
Main Results:
- Lower torso sweating onset (45.5 s) was significantly faster than on the head (126.5 s) but not significantly different from other regions.
- Transient sweating rates did not differ significantly among body regions.
- Mean steady-state forehead msw was not significantly greater than several other regions, but was higher than the chest, upper arm, calf, and thigh.
Conclusions:
- The study did not support a caudal-to-rostral sweat onset pattern during exercise in heat.
- Auditory canal temperature (Tac) sweat thresholds were similar across sites.
- Steady-state sweating rate distribution varied individually and was not primarily dominated by central body regions.