Rogowski Isabelle, Rouffet David, Lambalot Frederic, Brosseau Olivier, Hautier Christophe
Université de Lyon, Lyon, France.
J Appl Biomech. 2011 Feb;27(1):15-21. doi: 10.1123/jab.27.1.15.
This study compared EMG activity of young tennis players' muscles during forehand drives in two groups, GD-those able to raise by more than 150% the vertical velocity of racket-face at impact from flat to topspin forehand drives, and GND, those not able to increase their vertical velocity to the same extent. Upper limb joint angles, racket-face velocities, and average EMGrms values, were studied. At similar joint angles, a fall in horizontal velocity and a rise in racket-face vertical velocity from flat to topspin forehand drives were observed. Shoulder muscle activity rose from flat to topspin forehand drives in GND, but not for drives in GD. Forearm muscle activity reduced from flat to topspin forehand drives in GD, but muscle activation was similar in GND. The results show that radial deviation increased racket-face vertical velocity more at impact from the flat to topspin forehand drives than shoulder abduction.
本研究比较了两组年轻网球运动员在正手击球时肌肉的肌电图活动，其中GD组是那些能够在从平击正手击球转换为上旋正手击球时，将球拍面在击球瞬间的垂直速度提高超过150%的运动员，GND组是那些无法将垂直速度提高到相同程度的运动员。研究了上肢关节角度、球拍面速度和平均肌电图均方根值。在相似的关节角度下，观察到从平击正手击球到上旋正手击球时水平速度下降，球拍面垂直速度上升。在GND组中，从平击正手击球到上旋正手击球时肩部肌肉活动增加，但在GD组中则不然。在GD组中，从平击正手击球到上旋正手击球时前臂肌肉活动减少，但在GND组中肌肉激活情况相似。结果表明，从平击正手击球到上旋正手击球时，在击球瞬间桡侧偏斜比肩部外展更能增加球拍面垂直速度。
