Redox Status of Professional Soccer Players is Influenced by Training Load Throughout a Season.
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 (r(2)=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.
Movement, Sport and Health Sciences Laboratory (M2S), UFR APS University of Rennes 2, Rennes, France.
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Le Moal
Movement, Sport and Health Sciences Laboratory (M2S), UFR APS University of Rennes 2, Rennes, France.
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Groussard
Sport Sciences, University of Pau, Tarbes, France.
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Paillard
Stade Rennais Football Club, Rennes, France, SRFC, Rennes, France.
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Chaory
Performance Department, FC Lorient, Ploemeur, France.
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Le Bris
Stade Rennais Football Club, Rennes, France, SRFC, Rennes, France.
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Plantet
Department of Cardiovascular Surgery, University of Liege - CHU, Liege, Belgium.
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Pincemail
Laboratoire Mouvement Sport Sante, UFR APS, Rennes, France.
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Zouhal
D000293:Adolescent; D000975:Antioxidants / Q000502:physiology*; D056352:Athletes; D054874:Athletic Performance / Q000502:physiology*; D005978:Glutathione / Q000097:blood; D005979:Glutathione Peroxidase / Q000097:blood; D006801:Humans; D018384:Oxidative Stress; D064797:Physical Conditioning, Human / Q000379:methods*; D017382:Reactive Oxygen Species / Q000378:metabolism; D012916:Soccer / Q000502:physiology*; D013482:Superoxide Dismutase / Q000097:blood; D055815:Young Adult; D024502:alpha-Tocopherol / Q000097:blood; D019207:beta Carotene / Q000097:blood
D000975:Antioxidants; D017382:Reactive Oxygen Species; D019207:beta Carotene; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005978:Glutathione; D024502:alpha-Tocopherol