Document Detail

Intense endurance training on heart rate and blood pressure variability in runners.
MedLine Citation:
PMID:  11445759     Owner:  NLM     Status:  MEDLINE    
Physical training with incomplete recovery times can produce significant fatigue. A study of cardiovascular responses showed that there is a sympathetic and a parasympathetic form of fatigue. PURPOSE: The purpose of this experimentation was to measure the effects of intense endurance training on autonomic balance through a spectral analysis study of the heart rate (HR) and systolic blood pressure (SBP). METHODS: Eight elite runners were tested twice: after a relative rest period (RRP) of 3 wk and after an 12-wk intense training period (ITP) for endurance. At the end of each phase, the subjects were tested by means of a VO2max test and a tilt-table test. RESULTS: The resting heart rate (HR) variability was lower (P < 0.001) in the intensive training phase. Likewise, there were differences in the low-frequency (0.04-0.150 Hz; LF) and high-frequency (0.150-0.500 Hz; HF) components and the LF/HF ratio of the HR spectral analysis. The LF spectral power was significantly lower in the supine position (P < 0.05) during ITP. Upright tilting was accompanied by a 22.6% reduction in HF values during the rest period, whereas in ITP the HF spectral power rose by 31.2% (P < 0.01) during tilt, characterizing a greater parasympathetic system control. Sympathetic control represented by the LF/HF ratio regressed markedly (P < 0.01) in response to the tilt test in ITP. CONCLUSIONS: The spectral analysis of SBP in the high frequencies shows that the changes in cardiac parameters are coupled with a decrease in sympathetic vasomotor control (-18%) and a reduction in diastolic pressure (-3.2%) in the response to the tilt test at the end of ITP. Spectral analysis could be a means of demonstrating impairment of autonomic balance for the purpose of detecting a state of fatigue that could result in overtraining.
H Portier; F Louisy; D Laude; M Berthelot; C Y Guézennec
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  33     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2001 Jul 
Date Detail:
Created Date:  2001-07-10     Completed Date:  2001-12-07     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:  1120-5     Citation Subset:  IM; S    
Department of Physiology, Institut de Medecine Aérospatiale du Service de Santé des Armées, Bretigny sur Orge, France.
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MeSH Terms
Autonomic Nervous System / physiology*
Blood Pressure / physiology*
Cohort Studies
Fatigue / physiopathology
Heart Rate / physiology*
Oxygen Consumption / physiology
Physical Endurance / physiology*
Rest / physiology
Running / physiology*
Spectrum Analysis
Tilt-Table Test

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

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