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Muscle mechanoreceptor modulation of sweat rate during recovery from moderate exercise

¹Faculty of Human Life and Environmental Health, Nara Women's University, Nara 630-8506, Japan; ²Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Dallas 75231; and ³Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390

Submitted 22 December 2003 ; accepted in final form 5 February 2004

The objective of this study was to identify whether muscle mechanoreceptor stimulation is capable of modulating sweat rate. Seven healthy subjects performed two 20-min bouts of supine exercise on a tandem cycle ergometer (60 rpm at 65% of maximal heart rate). After one bout, the subject stopped exercising (i.e., no pedaling), whereas, after 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 (T_es), mean skin temperature (_sk), heart rate, mean arterial blood pressure, oxygen consumption, 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 T_es, _sk, or CVC. In contrast, early in the recovery period, chest and forearm sweat rate were 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·cm^-2·min^-1; both P < 0.05). These results suggested that muscle mechanoreceptor stimulation to the previously activated muscle is capable of modulating sweat rate.

metaboreceptor; sweating response

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