A biomechanical study on the effect of bouncing in front squats
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The purpose of this study was to compare performance, and biomechanics between a dynamic front squat, and a paused front squat variation. Specifically, we investigated how removing the bounce affected the execution of the squat, regarding lifting capacity, and the magnitude of net joint moment, including the distribution of the moment between the ankle, knee and hip. Furthermore, we examined how imposing the pause, affected trunk and thigh angels at key phases of the lift, in addition to differences in barbell velocity. Nineteen experienced weightlifters and powerlifters participated in the study. For each participant the one repetition maximum (1RM) in a dynamic front squat was established, before two single repetitions were performed at ninety percent of 1RM. The same protocol was followed for the paused variation. Kinematic data was collected using a ten-camera motion capture system, tracking forty-five skin-markers. Kinetic data was collected using two force plate platforms. Significance level used was P<0.05. The bottom bounce, increased the total support moment in the early phases of the dynamic front squat. The difference in 1RM was 4.5 %. This increase was mostly contributed from the knee joint moment 62.5 %. At the minimum moment phase, the total support moment was near identical between the variations. The bounce results in higher performance, by increasing the total support moment early in the concentric phase. This can potentially increase risk of injury. Implementing the pause does not change the technical execution of the squat, except for resulting in a deeper bottom position.
Masteroppgave - Norges idrettshøgskole, 2020