Background A high incidence of overuse knee injuries among youth basketball players may be attributed to improperly-managed jump load. Inertial measurement units are effective for counting jumps compared to traditional methods, but devices with a minimum threshold may underestimate total load.
Objective To compare jump counts from a commercially-available inertial measurement units to traditional counting methods for male and female youth basketball players.
Setting Youth basketball practices and games.
Patients (or Participants) 46 (19 Female) youth basketball players (ages 13–18).
Interventions (or Assessment of Risk Factors) Jump count and height were recorded using an inertial measurement unit (VERT®Classic) and raters counted the number of jumps from a simultaneous video recording.
Main Outcome Measurements The height of VERT®Classic jumps was compared between males and females. The total number of jumps recorded by the VERT®Classic and evaluated by video raters were compared using intraclass correlation coefficient (ICC(3,k)), mean offset, and Bland and Altman limits of agreement.
Results Males (14.1’ ±3.2’) had a greater jump height than females (9.9’ ±1.3’, p<0.001). For males, VERT®Classic jumps had excellent reliability with video-counted jumps (ICC(3,k)= 0.969), with a mean offset of -1.9 (fewer VERT®Classic) and limits of agreement -7.1 to 3.2 jumps. For females, VERT®Classic jumps had excellent reliability (ICC(3,k)= 0.916), with a mean offset of -9.3 (fewer VERT®Classic) and limits of agreement -28.2 to 9.6 jumps.
Conclusions The VERT®Classic can provide an estimate of jump load and provides a tool to monitor jump load in relation to overuse knee injuries in youth basketball players. Female youth basketball players appear to perform more jumping movements that are not registered by the VERT®Classic compared to males. Female youth basketball players may need an inertial measurement unit with a lower height threshold for jump count in order to more accurately monitor total jump load.
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