Document Detail

Time-frequency analysis of heart rate variability during immediate recovery from low and high intensity exercise.
MedLine Citation:
PMID:  17943304     Owner:  NLM     Status:  MEDLINE    
Previous studies have neglected the first recovery minutes after exercise when studying post-exercise heart rate variability (HRV). The present aim was to evaluate autonomic HR control immediately after exercise using Short-time Fourier transform (STFT) and to compare the effects of low [LI, 29(6)% of maximal power] and high [HI, 61(6)% of maximal power] intensity bicycle exercise on the HRV recovery dynamics. Minute-by-minute values for low (LFP(ln,) 0.04-0.15 Hz) and high (HFP(ln), 0.15-1.0 Hz) frequency power were computed from R-R interval data recorded from 26 healthy subjects during 10 min recovery period after LI and HI. The HRV at the end of exercise and recovery was assessed with Fast Fourier transform as well. The results showed that LFP(ln) and HFP(ln) during the recovery period were affected by exercise intensity, recovery time and their interaction (P < 0.001). HFP(ln) increased during the first recovery minute after LI and through the second recovery minute after HI (P < 0.001). HFP(ln) was higher for LI than HI at the end of the recovery period [6.35 (1.11) vs. 5.12 (1.01) ln (ms(2)), P < 0.001]. LFP(ln) showed parallel results with HFP(ln) during the recovery period. In conclusion, the present results obtained by the STFT method, suggested that fast vagal reactivation occurs after the end of exercise and restoration of autonomic HR control is slower after exercise with greater metabolic demand.
Kaisu Martinmäki; Heikki Rusko
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-10-18
Journal Detail:
Title:  European journal of applied physiology     Volume:  102     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2007-12-06     Completed Date:  2008-05-13     Revised Date:  2008-06-11    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  353-60     Citation Subset:  IM    
KIHU, Research Institute for Olympic Sports, Jyväskylä, Finland.
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MeSH Terms
Autonomic Nervous System / physiology
Bicycling / physiology
Exercise / physiology*
Exercise Test
Fourier Analysis
Heart Rate / physiology*
Middle Aged
Oxygen Consumption
Physical Endurance
Pulmonary Gas Exchange
Time Factors
Erratum In:
Eur J Appl Physiol. 2008 Jun;103(3):377-8

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