EFFECT OF THE HEART BEAT ON THE TONUS OF SKELETAL MUSCLE

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Abstract
Simultaneous tracings of the carotid pulse and knee-jerk were obtained from normal men students. The mean height of the knee-jerk was greater during the systole than during the diastole of the ventricle. Ten subjects representing 2000 knee-jerk measurements have been considered in respect to individual variations and the probable error of the mean. Using the knee-jerk as an index to muscle tonus the data shows that there is more tonus in the skeletal muscles duringfthe systole than during the diastole of the heart.

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