Journal of Applied Physiology Journal of Applied Physiology
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J Appl Physiol 82: 1126-1135, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 4, pp. 1126-1135, April 1997
CONTROL OF BREATHING, CIRCULATION, AND TEMPERATURE

Age, fitness, and regional blood flow during exercise in the heat

C. W. Ho, J. L. Beard, P. A. Farrell, C. T. Minson, and W. L. Kenney

Noll Physiological Research Center, Pennsylvania State University, University Park, Pennsylvania 16802-6900

Received 23 May 1996; accepted in final form 2 December 1996.

Ho, C. W., J. L. Beard, P. A. Farrell, C. T. Minson, and W. L. Kenney. Age, fitness, and regional blood flow during exercise in the heat. J. Appl. Physiol. 82(4): 1126-1135, 1997.---During dynamic exercise in warm environments, the requisite increase in skin blood flow (SkBF) is supported by an increase in cardiac output (Qc) and decreases in splanchnic (SBF) and renal blood flows (RBF). To examine interactions between age and fitness in determining this integrated response, 24 men, i.e., 6 younger fit (YF), 6 younger sedentary (YS), 6 older fit (OF), and 6 older sedentary (OS) rested for 50 min, then exercised at 35 and 60% maximal O2 consumption (VO2 max) at 36°C ambient temperature. YF had a significantly higher Qc and SkBF than any other group during exercise, but fitness level had no significant effect on any measured variable in the older men. At 60% VO2 max, younger subjects had significantly greater decreases in SBF and RBF than the older men, regardless of fitness level. Total flow redirected from these two vascular beds (Delta SBF + Delta RBF) followed YF >> YS > OF > OS. A rigorous 4-wk endurance training program increased exercise SkBF in OS, but Delta SBF and Delta RBF were unchanged. Under these conditions, older men distribute Qc differently to regional circulations, i.e., smaller increases in SkBF and smaller decreases in SBF and RBF. In younger subjects, the higher SkBF associated with a higher fitness level is a function of both a higher Qc and a greater redistribution of flow from splanchnic and renal circulations, but the attenuated splanchnic and renal vasoconstriction in older men does not appear to change with enhanced aerobic fitness.

skin blood flow; splanchnic blood flow; renal blood flow; cardiac output; hyperthermia; heat stress; aging; regional circulation

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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