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Objective: To evaluate the association of the weekly countermovement jump (CMJ) performance with injuries during an entire season of high-performance youth volleyball and basketball players. Design: An observational prospective study. Setting: Private practice within a high-performance sports center. Participants: Forty-nine youth high-performance volleyball and basketball players were enrolled (female volleyball, n = 12; female basketball, n = 17; male basketball, n = 20). Assessment of Risk Factor: All players were monitored weekly during an entire season by performing a maximal CMJ test 48 hours after every competition. All the sports injuries per 1000 Ae (athlete exposure) were registered. Main Outcome Measures: Authors hypothesized that lower CMJ performance would be associated with a higher incidence of injuries during the season. Results: The rate of injuries was 1.61 per 1000 Ae, with ankle (63.33%) being the most frequently affected region. Female basketball players showed a higher injury rate than the rest of the players (2.54 per 1000 Ae, P = 0.045). Binary logistic regression analysis demonstrated that week-to-week reductions in CMJ performance predicted lower limb injuries ( P 0.05). Conclusions: Reductions in weekly CMJ performance (>8.2%) can help predict lower limb injuries in youth volleyball and basketball players. An isolated CMJ performance evaluation during preseason is not enough to predict injuries during the sports season.
Sastre-Munar et al. (Wed,) studied this question.