期刊
SENSORS
卷 21, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/s21165254
关键词
biomechanics; inertial sensors; leg drive; lower limb drive; racket sport; serve speed
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-CAPES [001, 88887.364812/2019-00]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-CNPQ
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais-FAPEMIG
The study found that greater knee flexion during the preparation phase of a tennis serve led to higher racket velocity and knee extension velocity, with no significant difference in racket impact height between groups.
This study aimed to investigate the effects of knee flexion during the preparation phase of a serve on the tennis serve performance, using inertial sensors. Thirty-two junior tennis players were divided into two groups based on their maximum knee flexion during the preparation phase of serve: Smaller (SKF) and Greater (GKF) Knee Flexion. Their racket velocity, racket height, and knee extension velocity were compared during the tennis serve. Inertial sensors tracked participants' shank, thigh, and racket motions while performing five first, flat, and valid serves. Knee flexion was analysed during the preparation phase of serve, knee extension velocity after this phase, racket velocity just before ball impact, and racket height at impact. Pre-impact racket velocity (mean difference [MD] = 3.33 km/h, p = 0.004) and the knee extension velocity (MD = 130.30 degrees/s, p = 0.012) were higher in the GKF than SKF; however, racket impact height was not different between groups (p = 0.236). This study's findings support the importance of larger knee flexion during the preparation phase of serve-to-serve performance. This motion should be seen as a contributor to racket velocity.
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