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Decreased nonlinearity of arterial blood pressure signal after endurance exercise in rats

Yeragania, Vikram K and Collins, Heidi L and Radhakrishna Rao, KA and Rodenbaugh, David W and DiCarlo, Stephen E (2003) Decreased nonlinearity of arterial blood pressure signal after endurance exercise in rats. In: Nonlinear Analysis: Real World Applications, 4 (2). pp. 317-323.

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Background: Endurance exercise is associated with a decrease in post-exercise sympathetic nerve activity (SNA) and arterial pressure (AP) in humans and experimental animals. In this study, we measured pulsatile arterial pressure continuously for at least 5 min in rats before (n = 22) and after 8 weeks of daily exercise (n = 10) exercise. The purpose of this study was to determine if daily exercise produces post-exercise changes in measures of nonlinearity of the AP. The reason to analyze this signal before and after exercise is due to our previous =ndings of increased nonlinearity during sympathetic activation and=or vagal withdrawal and also our =nding of a decreased low frequency power (LF: 0.19–0:61 Hz) after endurance exercise training, as the decrease in the LF band of systolic blood pressure (BP), mean BP and pulse pressures is mediated by the sympathetic nervous system. Methods: The AP data were sampled at 200 Hz and we obtained nonlinearity measures for the entire 256 s of AP series sampled at 200 Hz (51 200 points). We also obtained =ve single AP wave signals of 180 ms duration and averaged them before and after exercise to calculate the 1=f slopes and the$ R^{2}$ values. Results: There was a signi=cant decrease in nonlinearity scores of AP signal after exercise. There was a signi=cant decrease in the 1=f slopes of AP after exercise. Conclusions: These results suggest that endurance exercise decreases AP variability and nonlinearity probably by decreasing SNA. The changes in the 1=f slopes need further investigation

Item Type: Journal Article
Publication: Nonlinear Analysis: Real World Applications
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Nonlinearity;Arterial blood pressure;Sympathetic activity; Exercise;1=f distribution.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 17 Dec 2008 11:15
Last Modified: 19 Sep 2010 04:53
URI: http://eprints.iisc.ac.in/id/eprint/16746

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