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Articles in PresS, published online ahead of print July 11, 2002
Am J Physiol Heart Circ Physiol, 10.1152/ajpheart.00112.2002
Submitted on February 8, 2002
Accepted on June 28, 2002
1 Physiology, Institute of Health Sciences, Hiroshima University Faculty of Medicine, Hiroshima, Hiroshima, Japan
* To whom correspondence should be addressed. E-mail: matsuk{at}hiroshima-u.ac.jp.
The assumption that tachycardia during light to moderate exercise was predominantly controlled by withdrawal of cardiac parasympathetic nerve activity but not by augmentation of cardiac sympathetic nerve activity (CSNA) was challenged by measuring CSNA during treadmill exercise (speed, 10-60m/min) for 1min in five conscious cats. As soon as exercise started, CSNA and heart rate (HR) increased and mean arterial pressure (MAP) decreased; their time courses at the initial 12-s period of exercise were irrespective of the running speed. CSNA increased 168-297% at 7.1±0.4s from the exercise onset and MAP decreased 8-13mmHg at 6.0±0.3s, preceding the increase of 40-53beats/min in HR at 10.5±0.4s. CSNA remained elevated during the later period of exercise while HR and MAP gradually increased until the end of exercise. After the cessation of exercise, CSNA returned quickly to the control while HR was slowly restored. In conclusion, cardiac sympathetic outflow augments at the onset of and during dynamic exercise even though the exercise intensity is low to moderate, which may contribute to acceleration of cardiac pacemaker rhythm.
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