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;
HFnu), and SampEn were reduced following RE (p < 0.05). Bazett corrected QTc interval
increased following RE (p < 0.05). Change in HFnu 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.
Key words
heart rate variability - sample entropy - acute exercise
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Mr.
Kevin Scott HeffernanMS
Department of Kinesiology and Community Health
Exercise and Cardiovascular Research Lab
Rehabilitation Education Center
University of Illinois at Urbana-Champaign
1207 S. Oak St.
Champaign, IL 61820
United States
Phone: + 1 21 76 21 89 00
Fax: + 1 21 73 33 04 04
Email: kheffer2@uiuc.edu
