Document Detail

Relation between heart rate variability and training load in middle-distance runners.
MedLine Citation:
PMID:  11039645     Owner:  NLM     Status:  MEDLINE    
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.
V Pichot; F Roche; J M Gaspoz; F Enjolras; A Antoniadis; P Minini; F Costes; T Busso; J R Lacour; J C Barthélémy
Related Documents :
1548495 - Effects of atropine on autonomic indices based on electrocardiographic r-r intervals in...
8282635 - Persistent peripheral vasodilation and sympathetic activity in hypotension after maxima...
1638105 - Spectral analysis of heart rate variability in bronchial asthma.
25435675 - Effects of exercise therapy on blood lipids of obese women.
477215 - Effect of the exercise of seven consecutive days hill-walking on fluid homeostasis.
10203125 - Recruitment of older adults for a randomized, controlled trial of exercise advice in a ...
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    
Laboratoire de Physiologie, Université de Saint-Etienne, France.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Autonomic Nervous System / physiology
Case-Control Studies
Exercise Tolerance / physiology*
Fourier Analysis
Heart Rate / physiology*
Longitudinal Studies
Prospective Studies

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

Previous Document:  Effect of static and dynamic exercise on heart rate and blood pressure variabilities.
Next Document:  Oxygen uptake in one-legged and two-legged exercise.