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J Appl Physiol 78: 1569-1574, 1995;
8750-7587/95 $5.00
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Journal of Applied Physiology, Vol 78, Issue 4 1569-1574, Copyright © 1995 by American Physiological Society

ARTICLES

Aortic-cardiac reflex during dynamic exercise

X. Shi, J. T. Potts, P. B. Raven and B. H. Foresman
Department of Physiology, University of North Texas Health Science Center, Fort Worth 76107, USA.

We investigated the aortic-cardiac reflex during low-intensity cycling in 10 healthy volunteers. Baroreflex function was assessed by the ratio of change in heart rate to mean arterial pressure (delta HR/delta MAP) during phenylephrine (PE) infusion. The ratio obtained during PE combined with low-level lower body negative pressure (LBNP) and calculated neck pressure (NP) was assessed as the gain of the aortic-cardiac reflex. Exercise (approximately 25% maximal O2 uptake or 25 +/- 2 W) significantly increased HR from 64 +/- 2 to 98 +/- 2 beats/min, MAP from 90 +/- 3 to 98 +/- 3 mmHg, cardiac output from 6.6 +/- 0.5 to 12.0 +/- 1.4 l/min, and O2 uptake from 3.8 +/- 0.2 to 10.4 +/- 0.6 ml.min-1.kg-1. However, delta MAP (+11.8 +/- 0.4 vs. + 11.3 +/- 0.8 mmHg), delta HR (-12.7 +/- 2 vs. -12.9 +/- 2 beats/min), and delta HR/delta MAP (1.10 +/- 0.19 vs. 1.15 +/- 0.15 beats.min-1.mmHg-1) were not statistically different between rest and exercise during PE. Although PE significantly increased central venous pressure in both supine rest (from 6.7 +/- 0.7 to 10.4 +/- 0.7 mmHg) and exercise (5.8 +/- 0.8 to 8.6 +/- 0.9 mmHg) conditions, when LBNP (-15 +/- 2 vs. -16 +/- 1 Torr for rest vs. exercise) was applied, both rest and exercise central venous pressures were returned to the preinfusion baseline values, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)


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