Document Detail

Monitoring for overreaching in rugby league players.
MedLine Citation:
PMID:  17219174     Owner:  NLM     Status:  MEDLINE    
The aim of this study was to identify indicators of non-functional overreaching (NFOR) in team sport athletes undertaking intensive training loads. Eighteen semi-professional rugby league players were randomly assigned into two pair matched groups. One group completed 6 weeks of normal training (NT) whilst the other group was deliberately overreached through intensified training (IT). Both groups then completed the same 7-day stepwise training load reduction taper. Multistage fitness test (MSFT) performance, VO2 (max), peak aerobic running velocity (V (max)), maximal heart rate, vertical jump, 10-s cycle sprint performance and body mass were measured pre- and post-training period and following the taper. Hormonal, haematological and immunological parameters were also measured pre-training and following weeks 2, 4 and 6 of training and post-taper. MANOVA for repeated measures with contrast analysis indicated that MSFT performance and VO2 (max) were significantly reduced in the IT group over time and condition, indicating that a state of overreaching was attained. However, the only biochemical measure that was significantly different between the IT and NT group was the glutamine to glutamate (Gln/Glu) ratio even though testosterone, testosterone to cortisol (T/C) ratio, plasma glutamate, and CK activity were significantly changed after training in both groups. Positive endurance and power performance changes were observed post-taper in the IT group confirming NFOR. These changes were associated with increases in the T/C ratio and the Gln/Glu ratio and decreases in plasma glutamate and CK activity. These results indicate that although there was no single reliable biochemical marker of NFOR in these athletes, the Gln/Glu ratio and MSFT test may be useful measures for monitoring responses to IT in team sport athletes.
Aaron J Coutts; Peter Reaburn; Terrence J Piva; Greg J Rowsell
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial     Date:  2007-01-12
Journal Detail:
Title:  European journal of applied physiology     Volume:  99     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-01-26     Completed Date:  2007-04-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  313-24     Citation Subset:  IM    
School of Leisure, Sport and Tourism, University of Technology, Sydney, Kuring-gai Campus, Lindfield, NSW, Australia.
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MeSH Terms
Anaerobic Threshold
Biological Markers / blood
Body Mass Index
Creatine Kinase, MM Form / blood
Cumulative Trauma Disorders / blood,  physiopathology*
Exercise Tolerance
Glutamic Acid / blood
Glutamine / blood
Heart Rate
Hydrocortisone / blood
Muscle Fatigue*
Muscle, Skeletal / physiopathology*
Oxygen Consumption
Physical Endurance*
Physical Exertion*
Prospective Studies
Reproducibility of Results
Testosterone / blood
Time Factors
Reg. No./Substance:
0/Biological Markers; 50-23-7/Hydrocortisone; 56-85-9/Glutamine; 56-86-0/Glutamic Acid; 58-22-0/Testosterone; EC Kinase, MM Form

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