Heart rate recovery and heart rate complexity following resistance ...

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Sep 21, 2007 - training increases both heart rate variability and heart rate recovery .... Lempel-Ziv entropy was calculated using the same data points as used for SampEn. ..... Tuzcu V, Nas S, Borklu T, and Ugur A. Decrease in the heart rate ...
Page Articles 1 of 32 in PresS. Am J Physiol Heart Circ Physiol (September 21, 2007). doi:10.1152/ajpheart.00648.2007

Heart rate recovery and heart rate complexity following resistance exercise training and detraining in young men

Kevin S. Heffernan, Chris A. Fahs, Kevin K. Shinsako, Sae Young Jae and Bo Fernhall

The Exercise and Cardiovascular Research Laboratory Department of Kinesiology and Community Health University of Illinois at Urbana-Champaign Champaign, IL

Running Head: Autonomic modulation following resistance training Supported in part by the American Heart Association Greater Midwest Affiliate and the American College of Sports Medicine Corresponding Author (

):

Kevin S. Heffernan, M.S. Department of Kinesiology and Community Health Exercise and Cardiovascular Research Laboratory Rehabilitation Education Center 1207 S. Oak St. Champaign, IL 61820 e-mail: [email protected] fax #: 217-333-0404

Copyright Information Copyright © 2007 by the American Physiological Society.

Page 2 of 32

Abstract The purpose of this study was to examine heart rate recovery and linear/non-linear heart rate variability before and after resistance training (RT). Fourteen young men (25.0 |*plusmn*| 1.1 years of age) completed a cross-over design consisting of a 4-week time control period, 6-weeks RT (3 days per week) and 4-weeks of detraining. Linear heart rate variability (HRV) was spectrally decomposed using an autoregressive approach. Non-linear dynamics of heart rate complexity included sample entropy (SampEn) and Lempel-Ziv entropy (LZEn). Heart rate recovery was calculated from a graded maximal exercise test as maximal heart rate attained during the test minus heart rate at 1-minute post exercise (HRR). There was no change in SampEn, LZEn or HRR following the time control portion of the study (p>0.05). Following RT there was an increase in SampEn (p 0.05). There was also no change in RR-interval (RRI) or standard deviation of RR-interval (RRI SD) (Table 4, p > 0.05). A significant time effect was detected for SampEn (Figure 2, p