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Does intramuscular thermal feedback modulate eccrine sweating in exercising humans?
G Todd1, C J Gordon, H Groeller
1Centre for Human and Applied Physiology, School of Medicine, University of Wollongong, Wollongong, NSW, Australia.
Acta Physiologica (Oxford, England)
|June 18, 2014
Summary
Skeletal muscles may contain thermosensitive elements influencing sweat secretion. Intramuscular temperature changes showed a faster link to sweating than deep-body temperature, suggesting a role in thermoregulation.
Area of Science:
- Exercise physiology
- Thermoregulation
- Human physiology
Background:
- Skeletal muscles' potential role in thermoregulation is understudied.
- Understanding the interplay between muscle temperature and sweating is crucial for exercise science.
Purpose of the Study:
- To investigate the temporal relationship between dynamic changes in deep-body and intramuscular temperatures and eccrine sweat secretion.
- To explore the possibility of thermosensitive elements within skeletal muscles modulating thermoeffector responses.
Main Methods:
- Eight subjects performed cycling with sinusoidal workload variations.
- Oesophageal, mean skin, and intramuscular (vastus lateralis) temperatures were measured.
- Temperatures were cross-correlated with forehead sweat rates.
Main Results:
- Both intramuscular and oesophageal temperatures strongly correlated with sweating variations.
- The phase delay between intramuscular temperature and sweating was significantly shorter than for oesophageal temperature.
- Maximal cross-correlation coefficients for intramuscular and oesophageal temperatures were not significantly different.
Conclusions:
- Temporal coupling of sweating to intramuscular temperature supports the presence of muscle thermosensitive elements.
- Skeletal muscles appear to play a role in modulating thermal sweating responses.
- Findings advance understanding of the physiological mechanisms of thermoregulation during exercise.
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