Document Detail


Relation between heart rate variability and training load in middle-distance runners.
MedLine Citation:
PMID:  11039645     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Monitoring physical performance is of major importance in competitive sports. Indices commonly used, like resting heart rate, VO2max, and hormones, cannot be easily used because of difficulties in routine use, of variations too small to be reliable, or of technical challenges in acquiring the data. METHODS: We chose to assess autonomic nervous system activity using heart rate variability in seven middle-distance runners, aged 24.6 +/- 4.8 yr, during their usual training cycle composed of 3 wk of heavy training periods, followed by a relative resting week. The electrocardiogram was recorded overnight twice a week and temporal and frequency indices of heart rate variability, using Fourier and Wavelet transforms, were calculated. Daily training loads and fatigue sensations were estimated with a questionnaire. Similar recordings were performed in a sedentary control group. RESULTS: The results demonstrated a significant and progressive decrease in parasympathetic indices of up to -41% (P < 0.05) during the 3 wk of heavy training, followed by a significant increase during the relative resting week of up to +46% (P < 0.05). The indices of sympathetic activity followed the opposite trend, first up to +31% and then -24% (P < 0.05), respectively. The percentage increasing mean nocturnal heart rate variation remained below 12% (P < 0.05). There was no significant variation in the control group. CONCLUSION: This study confirmed that heavy training shifted the cardiac autonomic balance toward a predominance of the sympathetic over the parasympathetic drive. When recorded during the night, heart rate variability appeared to be a better tool than resting heart rate to evaluate cumulated physical fatigue, as it magnified the induced changes in autonomic nervous system activity. These results could be of interest for optimizing individual training profiles.
Authors:
V Pichot; F Roche; J M Gaspoz; F Enjolras; A Antoniadis; P Minini; F Costes; T Busso; J R Lacour; J C Barthélémy
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  32     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2000 Oct 
Date Detail:
Created Date:  2001-01-17     Completed Date:  2001-02-08     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1729-36     Citation Subset:  IM; S    
Affiliation:
Laboratoire de Physiologie, Université de Saint-Etienne, France.
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MeSH Terms
Descriptor/Qualifier:
Adult
Autonomic Nervous System / physiology
Case-Control Studies
Electrocardiography
Exercise Tolerance / physiology*
Fatigue
Fourier Analysis
Heart Rate / physiology*
Humans
Longitudinal Studies
Male
Prospective Studies
Questionnaires
Running*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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