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J Appl Physiol 56: 381-387, 1984;
8750-7587/84 $5.00
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Journal of Applied Physiology, Vol 56, Issue 2 381-387, Copyright © 1984 by American Physiological Society

ARTICLES

Effect of an exercise regimen on development of hypertension in rats

M. J. Fregly

The possibility that a forced exercise regimen might prevent the development of hypertension induced in rats both by renal encapsulation and chronic administration of deoxycorticosterone acetate (DOCA) and NaCl has been studied. In renal hypertensive rats, forced exercise at 0.4 to 1.25 miles/day, 7 days/wk for 16-22 wk failed to prevent the development of hypertension and cardiomegaly and reduced renal concentrating ability accompanying the hypertension. In DOCA-treated rats (10 mg/wk), forced exercise at 0.4 and 0.8 mile/day, 7 days/wk for 16 wk also failed to prevent both the development of hypertension and cardiomegaly. A review of data of others reveals that exercise may delay the development of hypertension in both Dahl salt-sensitive and spontaneously hypertensive (SHR) rats and may modestly reduce the maximal level of pressure attained. Of the four models of hypertension studied to date in rats, the Dahl salt-sensitive strain appears to be the one that responded best to exercise, although blood pressure eventually reached that of sedentary controls.


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