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Int J Sports Med 2016; 37(09): 680-686
DOI: 10.1055/s-0035-1565199
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Redox Status of Professional Soccer Players is Influenced by Training Load Throughout a Season

E. Le Moal
1   Movement, Sport and Health Sciences Laboratory (M2S), UFR APS University of Rennes 2, Rennes, France
,
C. Groussard
1   Movement, Sport and Health Sciences Laboratory (M2S), UFR APS University of Rennes 2, Rennes, France
,
T. Paillard
2   Sport Sciences, University of Pau, Tarbes, France
,
K. Chaory
3   Stade Rennais Football Club, Rennes, France, SRFC, Rennes, France
,
R. Le Bris
4   Performance Department, FC Lorient, Ploemeur, France
,
K. Plantet
3   Stade Rennais Football Club, Rennes, France, SRFC, Rennes, France
,
J. Pincemail
5   Department of Cardiovascular Surgery, University of Liege – CHU, Liege, Belgium
,
H. Zouhal
6   Laboratoire Mouvement Sport Sante, UFR APS, Rennes, France
› Author Affiliations
Further Information

Publication History



accepted after revision 21 October 2015

Publication Date:
10 June 2016 (online)

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Abstract

The purpose of this study was to follow-up the variation of pro-/antioxidant status throughout a whole season in elite professional soccer players from the French league (n=19, 18.3±0.6 years) and to examine a possible link between these variations and training load. 5 time points (T1, T2, T3, T4, T5) were proposed to surround crucial periods of training during the whole season: the pre-season training/mid-season periods (T1–T2 and T3–T4), the championship or in-season periods (T2–T3 and T4–T5). At these times, blood samples were collected to measure pro-/antioxidant status (in erythrocytes: the ratio of reduced glutathione/oxidized glutathione, superoxide dismutase and glutathione peroxidase activities, in plasma: alpha-tocopherol, beta-carotene), and dietary intakes were also recorded. Training loads were quantified by the rating of perceived exertion method weekly throughout the season. Pro-/antioxidant-related measurements showed no modifications except for GSH/GSSG ratio, which evolved significantly between season periods: from 36.43±4.15 (T1) to 115.99±16.43 (T2) to 91.64±21.24 (T3) to 202.29±29.26 (T4) to 59.61±14.61 (T5). We observed a significant correlation (r2=0.84) between changes in GSH/GSSH ratio and cumulated mean training loads. In conclusion, these results suggest that the redox status of professional soccer players is altered according to training period (in-season periods) and that GSH/GSSH ratio variations are correlated with cumulated training loads.

Key words

soccer - oxidative stress - longitudinal follow-up - antioxidant - RPE - Training Load

Supplementary Material

 

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