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J Appl Physiol 10: 294-296, 1957;
8750-7587/57 $5.00
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Comparison of Effects of Static and Dynamic Work on Blood Pressure and Heart Rate

W. W. Tuttle 1 and Steven M. Horvath 1

1 From the Department of Physiology, College of Medicine, State University of Iowa, Iowa City, Iowa

It has been shown that when young men work at a rate of 1250 kg-m for 1 minute on a bicycle ergometer, a sharp significant rise in systolic arterial pressure occurs, accompanied either by no change or a slight decrease in diastolic pressure. Static work, on the other hand, consisting of squeezing a grip dynamometer at maximum effort for 1 minute, produced a sharp significant rise in both systolic and diastolic arterial pressure. The dynamic work was accompanied by a mean oxygen debt of 1200 ml, while in the static work there was a maintained steady state or a very small oxygen debt, the maximum value ever attained being 375 ml. It is suggested that the blood pressure effects reported are a consequence of reflexes which are modified by the metabolic changes associated with the work load.

Submitted on October 29, 1956




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