■Fourel,L,Touzard,P,法迪埃,M,阿尔勒,L,Deghies,K,奥赞,S,马丁,C.竞技网球运动员的力-时间曲线变量与网球发球表现之间的关系JStrengthCondResXX(X):000-000,2024-从业者认为腿在网球比赛中的作用是实现高性能的基础。但是,腿部动作与高速准确发球之间的确切联系仍然缺乏理解。这里,我们研究了发球腿驱动过程中的力-时间曲线变量与发球性能指标之间的相关性。三十六名竞技选手快速发球,在2个力板上,测量地面反作用力(GRF)。相关系数描述了最大球拍头速度之间的关系,冲击高度,和力-时间曲线变量。在所有测试的变量中,最大垂直和最大前后GRF时刻之间的经过时间(r=-0.519,p<0.001)以及最大前后GRF时刻与球撞击之间的经过时间(r=-0.522,p<0.001)是最大球拍速度的最佳预测因子。最大球拍头速度与平均或最大垂直GRF或平均或最大垂直力发展速率没有显着相关。冲击高度的最佳预测指标是同心阶段的相对净垂直冲量(r=0.772,p<0.001)。这项工作有助于更好地了解网球发球运动的机械要求,并为改善球员的准备和表现提供指导。教练应该鼓励他们的球员在发球期间更好地同步他们的向上和向前推动动作,以增加最大球拍头速度。玩家还应该通过力量训练和技术指导来提高他们的相对净垂直冲力,以增加撞击高度。
UNASSIGNED: Fourel, L, Touzard, P, Fadier, M, Arles, L, Deghaies, K, Ozan, S, and Martin, C. Relationships between force-time curve variables and
tennis serve performance in competitive
tennis players. J Strength Cond Res 38(9): 1667-1674, 2024-Practitioners consider the role of the legs in the game of
tennis as fundamental to achieve high performance. But, the exact link between leg actions and high-speed and accurate serves still lacks understanding. Here, we investigate the correlation between force-time curve variables during serve leg drive and serve performance indicators. Thirty-six competitive players performed fast serves, on 2 force plates, to measure ground reaction forces (GRF). Correlation coefficients describe the relationships between maximal racket head velocity, impact height, and force-time curve variables. Among all the variables tested, the elapsed time between the instants of maximal vertical and maximal anteroposterior GRF ( r = -0.519, p < 0.001) and the elapsed time between the instant of maximal anteroposterior GRF and ball impact ( r = -0.522, p < 0.001) are the best predictors of maximal racket velocity. Maximal racket head velocity did not significantly correlate with the mean or maximal vertical GRF or with the mean or maximum rate of vertical force development. The best predictor for impact height is the relative net vertical impulse during the concentric phase ( r = 0.772, p < 0.001). This work contributes to a better understanding of the mechanical demands of
tennis serve motion and gives guidelines to improve players preparation and performance. Trainers should encourage their players to better synchronize their upward and forward pushing action during the serve to increase maximal racket head velocity. Players should also aim to improve their relative net vertical impulse to increase impact height through strength training and technical instructions.