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J Appl Physiol 82: 1237-1243, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 4, pp. 1237-1243, April 1997
CONTROL OF BREATHING, CIRCULATION, AND TEMPERATURE

Sympathetic outflow to the skeletal muscle in humans increases during prolonged light exercise

Mitsuru Saito, Ryoko Sone, Masao Ikeda, and Tadaaki Mano

Laboratory of Applied Physiology, Toyota Technological Institute, Nagoya 468; and Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-01, Japan

Received 28 May 1996; accepted in final form 6 November 1996.

Saito, Mitsuru, Ryoko Sone, Masao Ikeda, and Tadaaki Mano. Sympathetic outflow to the skeletal muscle in humans increases during prolonged light exercise. J. Appl. Physiol. 82(4): 1237 - 1243, 1997.---To investigate the effects of exercise duration on muscle sympathetic nerve activity (MSNA), heart rate, blood pressure (BP), tympanic temperature, blood lactate concentration, and thigh electromyogram were measured in eight volunteers during 30 min of cycling in the sitting position at an intensity of 40% of maximal oxygen uptake. MSNA burst frequency increased 18 min after exercise was begun (25 ± 4 bursts/min at baseline and 36 ± 5 bursts/min at 21 min of exercise), reaching 41 ± 5 bursts/min at the end of exercise. Heart rate and systolic BP increased during exercise. Twenty minutes after commencement of exercise, however, both systolic and diastolic BP values tended to drop compared with the initial period of exercise. Tympanic temperature increased in a time-dependent manner, and the increment was significant 12 min after exercise was begun. Blood lactate concentration and integrated electromyogram showed no significant changes during exercise. The increased MSNA during prolonged light-intensity exercise may be a secondary effect of the drop in BP as a result of blood redistribution caused by thermoregulation rather than by metaboreflex.

blood pressure; blood redistribution; body temperature; autonomic response to exercise

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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