AJP - Heart Journal of Applied Physiology
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Am J Physiol Heart Circ Physiol 272: H2227-H2232, 1997;
0363-6135/97 $5.00
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AJP - Heart and Circulatory Physiology, Vol 272, Issue 5 2227-H2232, Copyright © 1997 by American Physiological Society

ARTICLES

Cardiac autonomic control is inversely related to blood pressure variability responses to psychological challenge

R. P. Sloan, R. E. Demeersman, P. A. Shapiro, E. Bagiella, J. P. Kuhl, A. S. Zion, M. Paik and M. M. Myers
Behavioral Medicine Program, Columbia-Presbyterian Medical Center, New York, New York, USA.

Blood pressure exhibits variability (BPV) at low (0.02- to 0.07-Hz), mid (0.07- to 0.15-Hz)-, and high (0.15- to 0.50-Hz) frequencies. Evidence suggests that BPV responses to challenge are inversely related to cardiac autonomic control. We tested this hypothesis by examining the BPV responses to psychological stressors in 22 normal subjects who differed in cardiac control, operationalized as resting heart period variability (HPV). HPV and BPV were measured noninvasively or a beat-to-beat basis. The stressors produced a significant increase in heart rate and a small but significant increase in diastolic blood pressure. As predicted, the changes in BPV in response to the stressors were inversely related to resting HPV. The results are interpreted in terms of a model of cardiovascular control that holds that BPV originates from feedforward effects of central control of the heart, feedback effects mediated through the baroreflexes, and direct sympathetic vascular effects.


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