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| Research article summary (published 29 Sep 2002): |
Autonomic adaptations to intensive and overload training periods: a laboratory study.
Full Abstract
PURPOSE:
Looking for practical and reliable markers of fatigue is of particular interest in elite sports. One possible marker might be the autonomic nervous system activity, known to be well affected by physical exercise and that can be easily assessed by heart rate variability.
METHODS:
We designed a laboratory study to follow six sedentary subjects (32.7 +/- 5.0 yr) going successively through 2 months of intensive physical training and 1 month of overload training on cycloergometer followed by 2 wk of recovery. Maximal power output over 5 min (Plim5'), VO(2) and standard indices of heart rate variability were monitored all along the protocol.
RESULTS:
During the intensive training period, physical performance increased significantly VO(2peak)
:
+20.2%, < 0.01; Plim5':
+26.4%, < 0.0001) as well as most of the indices of heart rate variability (mean RR, Ptot, HF, rMSSD, pNN50, SDNNIDX, SDNN, all < 0.05) with a significant shift in the autonomic nervous system toward a predominance of its parasympathetic arm (LF/HF, LFnu, HFnu, < 0.01). During the overload training period, there was a stagnation of the parasympathetic indices associated to a progressive increase in sympathetic activity (LF/HF, < 0.05). During the week of recovery, there was a sudden significant rebound of the parasympathetic activity (mean RR, HF, pNN50, rMSSD, all < 0.05). After 7 wk of recovery, all heart rate variability indices tended to return to the prestudy values.
CONCLUSION:
Autonomic nervous system status depends on cumulated physical fatigue due to increased training loads. Therefore, heart rate variability analysis appears to be an appropriate tool to monitor the effects of physical training loads on performance and fitness, and could eventually be used to prevent overtraining states.
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Author information
Author/s: Pichot, Vincent (V); Busso, Thierry (T); Roche, Frédéric (F); Garet, Martin (M); Costes, Frédéric (F); Duverney, David (D); Lacour, Jean-René (JR); Barthélémy, Jean-Claude (JC);
Affiliation: Laboratorie de Physiologie, GIP E2S, Université de Saint-Etienne, France. Vincent.Pichot@univ-st-etienne.fr
Journal and publication information
Publication Type: Journal Article
Journal: Medicine and science in sports and exercise (Med Sci Sports Exerc), published in United States. (Language: eng)
Reference: 2002-Oct; vol 34 (issue 10) : pp 1660-6
Dates: Created 2002/10/08; Completed 2003/04/03; Revised 2004/11/17;
PMID: 12370569, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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