Monitoring for overreaching in rugby league players

Coutts, AJ; Reaburn, P; Piva, TJ; Rowsell, GJ

Monitoring for overreaching in rugby league players

Coutts, AJ

Reaburn, P Piva, TJ Rowsell, GJ

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Publication Type:: Journal Article
Citation:: European Journal of Applied Physiology, 2007, 99 (3), pp. 313 - 324
Issue Date:: 2007-02-01

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Field	Value	Language
dc.contributor.author	Coutts, AJ https://orcid.org/0000-0002-1782-7691	en_US
dc.contributor.author	Reaburn, P	en_US
dc.contributor.author	Piva, TJ	en_US
dc.contributor.author	Rowsell, GJ	en_US
dc.date.available	2006-11-07	en_US
dc.date.issued	2007-02-01	en_US
dc.identifier.citation	European Journal of Applied Physiology, 2007, 99 (3), pp. 313 - 324	en_US
dc.identifier.issn	1439-6319	en_US
dc.identifier.uri	http://hdl.handle.net/10453/4682
dc.description.abstract	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, V̇O2max, peak aerobic running velocity (Vmax), 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 V̇O2max 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. © Springer-Verlag 2006.	en_US
dc.relation.ispartof	European Journal of Applied Physiology	en_US
dc.relation.isbasedon	10.1007/s00421-006-0345-z	en_US
dc.subject.classification	Sport Sciences	en_US
dc.subject.mesh	Muscle, Skeletal	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Cumulative Trauma Disorders	en_US
dc.subject.mesh	Testosterone	en_US
dc.subject.mesh	Hydrocortisone	en_US
dc.subject.mesh	Glutamic Acid	en_US
dc.subject.mesh	Glutamine	en_US
dc.subject.mesh	Adult	en_US
dc.subject.mesh	Anaerobic Threshold	en_US
dc.subject.mesh	Biomarkers	en_US
dc.subject.mesh	Body Mass Index	en_US
dc.subject.mesh	Creatine Kinase, MM Form	en_US
dc.subject.mesh	Exercise Tolerance	en_US
dc.subject.mesh	Football	en_US
dc.subject.mesh	Heart Rate	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Muscle Fatigue	en_US
dc.subject.mesh	Oxygen Consumption	en_US
dc.subject.mesh	Physical Endurance	en_US
dc.subject.mesh	Physical Exertion	en_US
dc.subject.mesh	Prospective Studies	en_US
dc.subject.mesh	Reproducibility of Results	en_US
dc.subject.mesh	Time Factors	en_US
dc.title	Monitoring for overreaching in rugby league players	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	99	en_US
utslib.for	110602 Exercise Physiology	en_US
utslib.for	1106 Human Movement and Sports Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Health
pubs.organisational-group	/University of Technology Sydney/Faculty of Health/Sports and Exercise Science
pubs.organisational-group	/University of Technology Sydney/Strength - CHSP - Health Services and Practice
pubs.organisational-group	/University of Technology Sydney/Strength - CHT - Health Technologies
utslib.copyright.status	closed_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	99	en_US

Abstract:

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, V̇O2max, peak aerobic running velocity (Vmax), 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 V̇O2max 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. © Springer-Verlag 2006.

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http://hdl.handle.net/10453/4682