Training adaptation and biological changes among well-trained male triathletes

D.G. Rowbottom, David Keast, P. Garcia-Webb, A.R. Morton

Research output: Contribution to journalArticle

42 Citations (Scopus)


The distinction between training and overtraining responses is an important prerequisite for any potential marker for monitoring overtraining in athletes. In this study, eight well-trained male triathletes undertook physical performance assessments, at 6 weekly intervals, throughout a 9-month intensive training season. At each assessment, a resting blood sample was obtained for determination of a number of biological parameters previously associated with overtraining. All athletes produced significant (P <0.05) improvements in running speed at anaerobic threshold (ATRS) from 15.6 +/- 0.2 k.h(-1) at the start of the season to 16.6 +/- 0.6 k.h(-1) at the time of major competitions. This improvement in performance was taken as evidence of well balanced training programs. Significant changes (P <0.05) in plasma glutamine and plasma uric acid concentrations were observed during the training season, and both correlated moderately with ATRS (r = 0.365 and r = -0.328, respectively). None of the other parameters measured showed any significant changes during the training season. The elevations in plasma glutamine concentration observed in response to long-term balanced training may be distinguishable from previous reports of decreased glutamine concentrations in overtrained athletes, making it a potentially valuable tool in the monitoring of overtraining in athletes.
Original languageEnglish
Pages (from-to)1233-1239
JournalMedicine and Science in Sports and Exercise
Issue number9
Publication statusPublished - 1997

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