Department of Physical Education, Chang'an University, Xi'an 710064, China.
Department of Exercise Science, School of Physical Education, Shaanxi Normal University, Xi'an 710119, China.
Int J Environ Res Public Health. 2022 Apr 23;19(9):5146. doi: 10.3390/ijerph19095146.
The aim of this study was to compare the kinematic and kinetic differences of the racket arm when balls were hit cross-court (CC) and down the line (DL) by topspin backhand. Eight elite female players participated and were instructed to hit the ball down the line and cross-court using a topspin backhand. Kinematic and kinetic data were collected. The results show that at the impact, participants had a greater wrist flexion angle in DL than CC ( = 0.017). The angular velocity of shoulder flexion ( = 0.038), shoulder abduction ( = 0.006) and thorax-pelvis internal rotation ( = 0.017) was faster when participants impacted the ball DL than CC. As for the joint kinetics, the shoulder external rotation moment was greater in CC than DL ( = 0.043). For a high-quality DL technique, it is important to exhibit a greater wrist flexion and have faster adduction and flexion in the shoulder, as well as faster internal rotation in thorax-pelvis, while having a smaller wrist flexion and more external rotation power in the shoulder are important to perform a CC at the impact. If these key and different factors of hitting CC and DL are ignored, it may lead to failure to complete a high-quality shot.
本研究旨在比较正手抽击球时，横击球和直线球的挥拍手臂运动学和动力学差异。八名优秀的女性参与者被要求用正手抽击球打出直线球和斜线球。采集运动学和动力学数据。结果表明，在击球瞬间，参与者在直线击球时的手腕屈曲角度大于斜线击球（ = 0.017）。直线击球时，肩部前屈角速度（ = 0.038）、肩部外展角速度（ = 0.006）和胸廓-骨盆内旋角速度（ = 0.017）均快于斜线击球。在关节动力学方面，直线击球时肩部外旋力矩大于斜线击球（ = 0.043）。为了实现高质量的直线击球技术，重要的是在击球瞬间展现更大的手腕屈曲角度，以及更快的肩部内收和前屈，以及更快的胸廓-骨盆内旋，而在肩部保持较小的手腕屈曲角度和更多的外旋力量则对完成斜线击球至关重要。如果忽略这些击打直线球和斜线球的关键和不同因素，可能会导致无法完成高质量的击球。
