| Monitoring for overreaching in rugby league players. | |
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MedLine Citation:
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PMID: 17219174 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Aaron J Coutts; Peter Reaburn; Terrence J Piva; Greg J Rowsell |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial Date: 2007-01-12 |
Journal Detail:
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Title: European journal of applied physiology Volume: 99 ISSN: 1439-6319 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2007 Feb |
Date Detail:
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Created Date: 2007-01-26 Completed Date: 2007-04-20 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 313-24 Citation Subset: IM |
Affiliation:
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School of Leisure, Sport and Tourism, University of Technology, Sydney, Kuring-gai Campus, Lindfield, NSW, Australia. Aaron.Coutts@uts.edu.au |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anaerobic Threshold Biological Markers / blood Body Mass Index Creatine Kinase, MM Form / blood Cumulative Trauma Disorders / blood, physiopathology* Exercise Tolerance Football* Glutamic Acid / blood Glutamine / blood Heart Rate Humans Hydrocortisone / blood Male Muscle Fatigue* Muscle, Skeletal / physiopathology* Oxygen Consumption Physical Endurance* Physical Exertion* Prospective Studies Reproducibility of Results Testosterone / blood Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Biological Markers; 50-23-7/Hydrocortisone; 56-85-9/Glutamine; 56-86-0/Glutamic Acid; 58-22-0/Testosterone; EC 2.7.3.2/Creatine Kinase, MM Form |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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