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J Appl Physiol 45: 1002-1004, 1978;
8750-7587/78 $5.00
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Journal of Applied Physiology, Vol 45, Issue 6 1002-1004, Copyright © 1978 by American Physiological Society

ARTICLES

"Paradoxical" reduction in postexercise ejection time and increased transthoracic impedance

Y. Nakamura, P. Kotilainen, B. Haffty, R. Jolda, R. Bishop and D. Spodick

Despite decreasing heart rate, left ventricular ejection time (LVET) transiently falls immediately following bicycle exercise. In seven normal, untrained subjects LVET decreases at 15 s postexercise corresponded (r = 0.78) with an increase in transthoracic electrical impedance (Z) consistent with decreased venous return to the thorax. Because the determinants of LVET are stroke volume (SV) and ejection rate, the deltaZ implies that decreased SV contributed to the "paradoxical" fall in LVET.




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