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Acute Resistance Exercise Reduces Heart Rate Complexity and Increases QTc Interval

Abstract Acute resistance exercise (RE) has been shown to reduce cardiac vagal control. Whether this would in turn affect QTc interval (an index of ventricular depolarization/repolarization) or heart rate complexity is not known. Heart rate variability (HRV), heart rate complexity (SampEn), and QT i...

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Published in:International journal of sports medicine 2008-04, Vol.29 (4), p.289-293
Main Authors: Heffernan, K. S., Sosnoff, J. J., Jae, S. Y., Gates, G. J., Fernhall, B.
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container_end_page 293
container_issue 4
container_start_page 289
container_title International journal of sports medicine
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creator Heffernan, K. S.
Sosnoff, J. J.
Jae, S. Y.
Gates, G. J.
Fernhall, B.
description Abstract Acute resistance exercise (RE) has been shown to reduce cardiac vagal control. Whether this would in turn affect QTc interval (an index of ventricular depolarization/repolarization) or heart rate complexity is not known. Heart rate variability (HRV), heart rate complexity (SampEn), and QT interval (rate corrected using Bazett, Fridericia, Hodges, and Framingham) were measured before and 5 min after an acute RE bout in twelve healthy young men. Normalized high frequency power of HRV (an index of cardiac parasympathetic modulation; HF nu ), and SampEn were reduced following RE (p < 0.05). Bazett corrected QTc interval increased following RE (p < 0.05). Change in HF nu from rest to recovery was correlated with both change in SampEn (r = 0.51, p < 0.05) and change in QTc interval for each method of correction (r = - 0.67 to - 0.70, p < 0.05). Acute RE reduced HF spectral power of HRV and this was related to both reduced heart rate complexity and increased QTc length. Thus, during recovery from acute RE, there is prolongation of depolarization and repolarization of the ventricles concomitant with reduced cardiac irregularity, and this may be related to a reduction in cardiac vagal control.
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subjects Adult
Biological and medical sciences
Electrocardiography
Exercise - physiology
Exercise Test
Fundamental and applied biological sciences. Psychology
Heart Rate - physiology
Humans
Male
Physiology & Biochemistry
Rest - physiology
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
title Acute Resistance Exercise Reduces Heart Rate Complexity and Increases QTc Interval
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