Related Experiment Videos
Mean body temperature does not modulate eccrine sweat rate during upright tilt
Thad E Wilson1, Jian Cui, Craig G Crandall
1Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, 7232 Greenville Ave., Dallas, TX 75231, USA.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 8, 2004
Summary
This study found that mean body temperature does not affect eccrine sweat rate or skin sympathetic nerve activity (SSNA) during head-up tilt. These findings clarify the role of baroreflexes in thermoregulation.
Area of Science:
- Physiology
- Thermoregulation
- Autonomic Nervous System
Background:
- Conflicting research exists on baroreflex control of eccrine sweat rate.
- Differing mean body temperatures across studies may explain these discrepancies.
Purpose of the Study:
- To investigate if mean body temperature modulates the effect of head-up tilt on sweat rate and skin sympathetic nerve activity (SSNA).
Main Methods:
- Measured mean body temperature, SSNA via microneurography, and sweat rate in 13 subjects during head-up tilt under whole-body heating.
- Utilized neostigmine to augment sweating at specific forearm sites.
Main Results:
- Elevated mean body temperature and sweat rate were observed at the end of heat stress.
- No significant correlations were found between mean body temperature and changes in SSNA or sweat rate at any site during head-up tilt.
- No significant differences in sweat rate were observed between supine and tilted positions.
Conclusions:
- Mean body temperature does not appear to modulate eccrine sweat rate during baroreceptor unloading induced by head-up tilt.
- This study provides evidence against a significant role for mean body temperature in this specific physiological response.
Keywords:
Non-programmatic