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Clinical and Experimental Hypertension Volume 24, 2002 - Issue 3
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Daily Exercise Reduces Measures of Heart Rate and Blood Pressure Variability in Hypertensive Rats

S. E. DiCarlo Department of Physiology, Wayne State University School of Medicine, Detroit, MI, 48201, U.S.A.
,
H. L. Collins Department of Physiology, Wayne State University School of Medicine, Detroit, MI, 48201, U.S.A.
,
D. W. Rodenbaugh Department of Physiology, Wayne State University School of Medicine, Detroit, MI, 48201, U.S.A.
,
M. R. Smitha Department of Cardiology, Johns Hopkins School of Medicine, Baltimore, MD, 21205, U.S.A.
,
R. D. Berger Department of Cardiology, Johns Hopkins School of Medicine, Baltimore, MD, 21205, U.S.A.
&
V. K. Yeragani Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, MI, 48201, U.S.A.
Pages 221-234 | Received 26 Mar 2001, Published online: 15 Apr 2002
 
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Abstract

This study was designed to test the hypothesis that daily spontaneous running (DSR) reduces measures of heart rate and blood pressure variability in spontaneously hypertensive rats (SHR). After 8 weeks of DSR or sedentary control, rats were chronically instrumented with arterial catheters. Daily exercise reduced most measures of heart rate (HR) and blood pressure variability. Specifically DSR decreased heart rate, Low Frequency Power (LF: 0.19–0.61 Hz), and Low Frequency/High Frequency (HF: 1.2–2.5 Hz) ratio of HR. Furthermore, Total Power (TP), LF power, and LF/HF ratio of systolic blood pressure were reduced by daily spontaneous running. Finally, TP, LF and HF powers and LF/HF ratios of diastolic blood pressure were reduced by daily spontaneous running. These data demonstrate that daily exercise reduces sympathetic activity and possibly increases cardiac reserve in hypertensive animals.

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