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J Appl Physiol 64: 2420-2427, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 64, Issue 6 2420-2427, Copyright © 1988 by American Physiological Society


ARTICLES

Regional muscle blood flow capacity and exercise hyperemia in high-intensity trained rats

M. H. Laughlin, R. J. Korthuis, W. L. Sexton and R. B. Armstrong
Department of Biomedical Sciences, College of Veterinary Medicine, Columbia, Missouri.

The purpose of this study was to determine the effects of high-intensity treadmill exercise training on 1) the regional distribution of muscle blood flow within and among muscles in rats during high-intensity treadmill exercise (phase I) and 2) on the total and regional hindlimb skeletal muscle blood flow capacities as measured in isolated perfused rat hindquarters during maximal papaverine vasodilation (phase II). Two groups of male Sprague-Dawley rats were trained 5 days/wk for 6 wk with a program consisting of 6 bouts/day of 2.5-min runs at 60 m/min up a 15% grade with 4.5-min rest periods between bouts. After training, blood flows were measured with the radiolabeled microsphere technique (phase I) in pair-weighted sedentary control and exercise-trained rats while they ran at 60 m/min (0% grade). In phase II of the study, regional vascular flow capacities were determined at three perfusion pressures (30, 40, and 50 mmHg) in isolated perfused hindquarters of control and trained rats maximally vasodilated with papaverine. The results indicate that this exercise training program produces increases in the vascular flow capacity of fast-twitch glycolytic muscle tissue of rats. However, these changes were not apparent in the magnitude or distribution of muscle blood flow in conscious rats running at 60 m/min, since blood flows within and among muscles during exercise were the same in trained and control rats.


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