SPSS-datasheet_damaging protocol_revised

This study aimed to assess changes in jump asymmetry magnitudes in adolescents over a 72-hour period following a muscle fatigue-inducing protocol. Single-leg 10-second hop jump (SL10J), single-leg countermovement jump (SLCMJ), and single-leg horizontal jump (SLHJ) asymmetry were measured at baseline, immediately post-protocol, and at 24, 48, and 72-hours post-protocol in 7 female and 15 male adolescents aged 12 – 18 years. Bioelectrical impedance analysis (BIA) was used to assess muscle damage, while the Visual Analog Scale (VAS) assessed muscle soreness and the bilateral countermovement jump (BCMJ) and bilateral horizontal jump (BHJ) indicated changes in absolute jump performance. A significant increase in SL10J asymmetry was observed 48 hours post-protocol (p < 0.001), while no significant changes were detected immediately post-protocol or at 24 and 72 hours. No significant changes were found in SLCMJ or SLHJ asymmetry at any time point. BIA did not indicate significant muscle damage, though a significant increase in muscle soreness (VAS), peaking at 48hours post-protocol was recorded. The kappa values indicated slight to moderate agreement for task specificity and slight to substantial agreement for time specificity, with the highest consistency between 24 and 48 hours post-protocol for both SLCMJ and SL10J. Asymmetry significantly increased only for SL10J at 48 hours post-protocol, suggesting that repeated jump tests may be more sensitive to fatigue-induced asymmetry than single-jump tests. The substantial kappa values at 24 and 48 hours highlight the potential to offer a more robust assessment of asymmetry when recovering from a fatigue-inducing event.