Monitoring for overreaching in rugby league players

Aaron J. Coutts, Peter Reaburn, Terrence J. Piva, Greg J. Rowsell

Research output: Contribution to journalArticleResearchpeer-review

119 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)313-324
Number of pages12
JournalEuropean Journal of Applied Physiology
Volume99
Issue number3
DOIs
Publication statusPublished - Feb 2007
Externally publishedYes

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Football
Glutamic Acid
Glutamine
Athletes
Sports
Hydrocortisone
Testosterone
Running
Research Design
Biomarkers
Heart Rate

Cite this

Coutts, Aaron J. ; Reaburn, Peter ; Piva, Terrence J. ; Rowsell, Greg J. / Monitoring for overreaching in rugby league players. In: European Journal of Applied Physiology. 2007 ; Vol. 99, No. 3. pp. 313-324.
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Monitoring for overreaching in rugby league players. / Coutts, Aaron J.; Reaburn, Peter; Piva, Terrence J.; Rowsell, Greg J.

In: European Journal of Applied Physiology, Vol. 99, No. 3, 02.2007, p. 313-324.

Research output: Contribution to journalArticleResearchpeer-review

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