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An examination of the curves of the duration of systoles in men and women, in recumbent, sitting and standing positions, with respect to cycle lengths, these being plotted as abscissae and systole lengths as ordinates, show that systoles in all positions progressively shorten as cycle lengths decrease. As cycle lengths shorten (pulse rates increase) not only is there less time for venous blood to accumulate, but the blood is pumped out of the veno-auricular reservoir more rapidly, and the systoles become shorter and shorter as the cycles decrease. The systoles are longer in the recumbent position than in sitting, and
Sex-Differences in Heart Action. I, Duration of Systole; II, Heart Rate.. Ann Intern Med. ;1:938–939. doi: 10.7326/0003-4819-1-11-938
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Published: Ann Intern Med. 1928;1(11):938-939.
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