CMJ was calculated from flight time, measured by an optical system (Optojump next, Microgate, Bolzano, Italy). The students were asked to jump as high as possible with their arms on their hips (akimbo) maintaining the same body position during take-off and landing [42 (link)]. Three jumps were performed interspersed with 30 s of rest, and the best performance was used as a baseline value. CMJ was measured again one minute after the end of the repeated shuttle-sprint running test.
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