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. 2013 Dec;47(Suppl 1):i59–i69. doi: 10.1136/bjsports-2013-092559

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Performance responses to the camp. Mean (SD) values (upper panel) and individual relative changes (middle and lower panel) in Yo-YoIR2 during the camp and the following 4 weeks in players belonging to the normoxic (NORM) or hypoxic exposure (HYP) groups. ***, Almost certain within-group difference versus Pre (ie, day 0). †, Likely within-group difference versus Post (ie, day 13). #, Possible between-group difference in the change (4WPost vs Post). The grey horizontal area represents the typical error of measurement of the test (ie, 10%²³).