Effect of chronic strength training on the baroreflex response during acute exercise

Date
2004-01-01
Authors
Shook, Robin
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Altmetrics
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Research Projects
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Kinesiology
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Abstract

Chronic strength training at high intensities produces large increases in arterial pressure and heart rate, similar to the increased loading on baroreceptors that result in reductions of the baroreflex experienced in endurance subjects. To determine the effect of high intensity weight training on the baroreflex response, incremental intensities of neck pressure and suction were applied to 10 untrained and 10 strength-trained individuals during 1) rest, 2) isometric biceps contraction at 30% of maximal voluntary contraction (MVC), and 3) isometric quadriceps contraction at 30% MVC. Heart rate (HR) saturation, threshold, and operating ranges increased similarly during isometric biceps and quadriceps contraction, indicating baroreceptor resetting under each condition. The maximum slope of the stimulus-response curves plotting HR versus carotid distending pressure of the chronically strength trained subjects did not differ from the untrained subjects. There was no difference between groups in terms of HR saturation, threshold, or operating point. The data suggest there is not a difference in central command-mediated baroreceptor resetting between chronically strength-trained and untrained individuals performing isometric exercise at the same intensities.

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Keywords
Health and human performance, Exercise and sport science (Biological basis of physical activity), Biological basis of physical activity
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