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

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

Research output: Contribution to journalArticle

78 Scopus citations

Abstract

The purpose of this study was to examine heart rate recovery (HRR) and linear/nonlinear heart rate variability (HRV) before and after resistance training. Fourteen young men (25.0 ± 1.1 yr of age) completed a crossover design consisting of a 4-wk time-control period, 6 wk of resistance training (3 days/wk), and 4 wk of detraining. Linear HRV was spectrally decomposed using an autoregressive approach. Nonlinear dynamics of heart rate complexity included sample entropy (SampEn) and Lempel-Ziv entropy (LZEn). HRR was calculated from a graded maximal exercise test as maximal heart rate attained during the test minus heart rate at 1 min after exercise (HRR). There was no change in SampEn, LZEn, or HRR after the time-control portion of the study (P > 0.05). SampEn (P < 0.05), LZEn (P < 0.05), and HRR (P < 0.05) increased after resistance training and returned to pretraining values after detraining. There was no change in spectral measures of HRV at any time point (P > 0.05). These findings suggest that resistance exercise training increases heart rate complexity and HRR after exercise but has no effect on spectral measures of HRV in young healthy men. These autonomic changes regress shortly after cessation of training.

Original languageEnglish (US)
Pages (from-to)H3180-H3186
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume293
Issue number5
DOIs
StatePublished - Nov 1 2007
Externally publishedYes

Keywords

  • Autonomic
  • Entropy
  • Heart rate variability
  • Parasympathetic

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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