Document Detail

Heart rate variability, blood pressure variability, and baroreflex sensitivity in overtrained athletes.
MedLine Citation:
PMID:  17016118     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To assess the effects of abruptly intensified physical training on cardiovascular control. DESIGN: Retrospective longitudinal study. SETTING: Research laboratory. PARTICIPANTS: Ten healthy athletes (5 men and 5 women) from track and field as well as triathlon. INTERVENTIONS: A 2-week training camp, including daily stepwise increasing cycling tests, running of 40 minutes, and additional cycling of 60 minutes. MAIN OUTCOME MEASUREMENTS: Time and frequency domain parameters of resting heart rate and blood pressure variability (HRV and BPV) and baroreflex sensitivity (BRS), before, during, and after the training camp. RESULTS: We found significantly reduced HRV during the training camp (mean beat-to-beat interval: 1042 [937 to 1194] ms vs. 933 [832 to 1103] ms vs. 1055 [947 to 1183] ms, P < 0.01; root-mean-square of beat-to-beat interval differences: 68 [52 to 95] ms vs. 52 [38 to 71] ms vs. 61 [48 to 78] ms, P < 0.05). Further, BRS was significantly reduced: 25.2 (20.4 to 40.4) ms/mmHg vs. 17.0 (12.9 to 25.7) ms/mmHg vs. 25.7 (18.8 to 29.1) ms/mmHg, P < 0.05. These effects disappeared at a large degree after 3 to 4 days of recovery. CONCLUSION: Abruptly intensified physical training results in an altered autonomic cardiovascular activity towards parasympathetic inhibition and sympathetic activation that can be monitored by means of HRV and BRS analyses and might provide useful markers to avoid the overtraining syndrome.
Mathias Baumert; Lars Brechtel; Jürgen Lock; Mario Hermsdorf; Roland Wolff; Vico Baier; Andreas Voss
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine     Volume:  16     ISSN:  1050-642X     ISO Abbreviation:  Clin J Sport Med     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-10-03     Completed Date:  2007-02-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9103300     Medline TA:  Clin J Sport Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  412-7     Citation Subset:  IM    
Department of Medical Engineering, University of Applied Sciences Jena, Germany.
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MeSH Terms
Athletic Injuries / diagnosis,  etiology,  physiopathology
Blood Pressure / physiology*
Exercise Tolerance / physiology*
Health Surveys
Heart Rate / physiology*
Oxygen Consumption / physiology
Physical Education and Training*
Retrospective Studies
Track and Field / education*

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

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