Journal of Applied Physiology
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J Appl Physiol (February 6, 2004). doi:10.1152/japplphysiol.01370.2003
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Submitted on December 22, 2003
Accepted on February 5, 2004

Muscle mechanoreceptor modulation of sweat rate during recovery from moderate exercise

Manabu Shibasaki1*, Mieko Sakai1, Mayumi Oda1, and Craig G Crandall2

1 Faculty of Human Life and Environmental Health, Nara Women's University, Nara, Japan
2 Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Dallas, TX, USA; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA

* To whom correspondence should be addressed. E-mail: shiba{at}cc.nara-wu.ac.jp.

The objective of this study was to identify whether muscle mechanoreceptor stimulation is capable of modulating sweat rate. Seven healthy subjects performed two 20-minute bouts of supine exercise on a tandem cycle ergometer (60 rpm at 65% of max heart rate). Following one bout the subject stopped exercising (i.e. no-pedaling), while following the other bout the subject's legs were passively cycled (at 60 rpm) via a second person cycling the tandem ergometer. This allows for mechanical stimulation of muscle with minimal activation of central command. Esophageal temperature (Tes), mean skin temperature (Tsk), heart rate, mean arterial blood pressure, oxygen consumption (VO2), cutaneous vascular conductance (CVC), and sweat rate were not different during the two exercise bouts. Regardless of the mode of exercise recovery, there were no differences in Tes, Tsk, or CVC. In contrast, early in the recovery period chest and forearm sweat rate was significantly greater in the passive cycling recovery mode relative to the no-pedaling condition (Chest: 0.57 ± 0.13 vs. 0.39 ± 0.14, Forearm: 0.30 ± 0.05 vs. 0.12 ± 0.02, mg/cm2/min, both P<0.05). These results suggested that muscle mechanoreceptor stimulation to the previously activated muscle is capable of modulating sweat rate.




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