Low-intensity exercise delays the shivering response to core cooling
Tomomi Fujimoto1, Bun Tsuji2, Yosuke Sasaki1,3
1Faculty of Health and Sport Sciences, University of Tsukuba , Ibaraki , Japan.
Summary
Low-intensity aquatic exercise delays the shivering response threshold during core cooling. Shivering sensitivity and thermal sensation remain unaffected, suggesting altered thermoregulation during exercise in cool water.
Area of Science:
- Exercise Physiology
- Thermoregulation
- Environmental Medicine
Background:
- Aquatic exercise can lead to hypothermia despite heat production from muscles.
- Human thermoregulatory responses to cold during exercise are not fully understood.
Purpose of the Study:
- To investigate the effect of low-intensity exercise on shivering response during core cooling in cool water.
- To elucidate human thermoregulatory responses to cold during aquatic exercise.
Main Methods:
- Eight healthy young men underwent cool water immersion while resting and during loadless pedaling.
- Body temperature was elevated prior to cooling to identify shivering initiation threshold.
- Esophageal temperature (Tes) and oxygen uptake (Vo2) were monitored during cooling.
Main Results:
- The core temperature threshold for shivering (indicated by rapid Vo2 increase) was lower during exercise (36.2°C) than rest (36.5°C).
- Shivering sensitivity, measured by the Tes-Vo2 relation slope, did not differ between rest and exercise.
- Thermal sensation response to core cooling was also similar between rest and exercise conditions.
Conclusions:
- Low-intensity exercise in cool water appears to delay the core temperature threshold for shivering onset.
- Shivering sensitivity and thermal sensation are not significantly altered by low-intensity exercise during cooling.
- These findings suggest a modified thermoregulatory strategy during aquatic exercise in the cold.
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