The influence of recording speed on apexcardiographic timing - A multi-observer study of precision and performance utilizing randomized tracings in multiple subjects.
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Pigott, V. M.↗
Engineering topics
Pigott, V. M.
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Cardiocirculatory responses to exercise - Physiologic study by noninvasive techniques.
The changes from rest to exercise were determined for certain phases of the cardiac cycle in ten healthy male subjects who underwent submaximal, physiologically paced bicycle ergometry. ECGs, phonocardiograms, and carotid pu lse tracings were recorded. The preejection period and isovolumic contraction time decreased with exercise. Changes in left ventricular ejection time appeared to depend on the severity or the duration of stress. Pulse transmission time did not change significantly. The data obtained in the study and comparison of these results to those obtained by invasive methods indicate that noninvasive techniques, when used in the manner suggested, are appropriate means for detecting a variety of cardiocirculatory changes during exercise.
Pigott, V. M.↗