Journal of Applied Physiology
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J Appl Physiol 63: 342-346, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 63, Issue 1 342-346, Copyright © 1987 by American Physiological Society

ARTICLES

Influence of exercise training on resting blood pressures of Dahl rats

C. M. Tipton, J. M. Overton, E. B. Pepin, J. G. Edwards, J. Wegner and E. M. Youmans

To determine whether female Dahl salt-sensitive (SS) hypertensive rats would adapt to chronic treadmill exercise by exhibiting lower resting systolic blood pressures (RSBP), a 12-wk training program was undertaken. Female Dahl salt-resistant (SR) rats were also trained for the same time period a a similar intensity [40-70% maximal O2 consumption (VO2max)] and duration (55 min). Postexperimental treadmill run times and VO2max values [SR: nontrained (NT) 87 +/- 1, trained (T) 97 +/- 2; SS: NT 82 +/- 2, T 92 +/- 3 ml.min-1 X min-1 X kg-1] indicated that the prescribed program had produced a trained state. However, the training program caused no group differences between the SR or the SS and their nontrained controls in measurements associated with sodium chloride intake, fluid consumption, urine production, 24-h sodium excretion, plasma volumes, plasma insulin, or blood volumes. Chronic exercise did significantly lower RSBP in the SR subgroup after 6 wk (NT 123 +/- 4, T 110 +/- 3 mmHg) and 8 wk (NT 120 +/- 4, T 106 +/- 2 mmHg) and remained lower throughout the remaining weeks of the experiment. On the other hand, the RSBP results of the trained SS rats were significantly higher than the nontrained SS rats after 6 wk (NT 155 +/- 8, T 191 +/- 7 mmHg) and were never significantly different than the controls for the remainder of the study.(ABSTRACT TRUNCATED AT 250 WORDS)


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