Wu S K, Gross M T, Prentice W E, Yu B
Center for Human Movement Science, Division of Physical Therapy, University of North Carolina at Chapel Hill, 27599-7135, USA.
J Orthop Sports Phys Ther. 2001 May;31(5):247-54. doi: 10.2519/jospt.2001.31.5.247.
A mixed design for kinetic comparison of 2 types of one-handed backhand strokes and 2 skill levels in tennis.
To develop and evaluate a model to estimate the impact force on the racquet during tennis stroke, and to compare the peak impact force between one-handed backhand stroke with a long backswing and one-handed backhand stroke with a short backswing and between the beginning and advanced players.
A one-handed backhand stroke is commonly used in tennis and may be associated with many upper extremity over-use injuries. An understanding of kinetics of the backhand stroke is essential for understanding injury mechanisms and prevention.
Five male advanced tennis players and 4 male and 1 female beginning tennis players participated. Mean age was 32.2 +/- 7.0 years. Each subject was instructed to use the 2 types of one-handed backhand strokes to hit balls from a tennis ball machine. Three-dimensional coordinates of critical body and racquet landmarks were obtained. A mathematical model was developed to estimate the contact duration and the peak impact force during a stroke.
The estimated peak impact forces were reproducible and comparable to those reported in the literature from direct measurements. A one-handed backhand stroke with a short backswing had a significantly shorter contact duration (0.008 +/- 0.003 seconds) and a greater peak resultant impact force (330.0 +/- 140.7) than that with a long backswing (0.016 +/- 0.004 seconds and 180.8 +/- 49.1 N). Skill level did not significantly affect the peak resultant impact force.
A long backswing in a one-handed backhand stroke may reduce the load on the upper extremity and may assist in reducing the risks of tennis-related upper extremity over-use injuries.
一项关于网球中两种单手反手击球动作和两种技能水平的动力学比较的混合设计。
开发并评估一个模型，以估计网球击球过程中作用于球拍的冲击力，并比较长引拍单手反手击球与短引拍单手反手击球之间以及初学者和进阶者之间的峰值冲击力。
单手反手击球是网球中常用的击球方式，可能与许多上肢过度使用损伤有关。了解反手击球的动力学对于理解损伤机制和预防至关重要。
五名男性进阶网球运动员以及四名男性和一名女性初级网球运动员参与研究。平均年龄为32.2±7.0岁。每位受试者被要求使用两种单手反手击球动作击打网球发球机发出的球。获取关键身体部位和球拍标志点的三维坐标。开发了一个数学模型来估计击球过程中的接触持续时间和峰值冲击力。
估计的峰值冲击力具有可重复性，且与文献中直接测量报告的结果相当。短引拍单手反手击球的接触持续时间显著更短（0.008±0.003秒），峰值合力冲击力更大（330.0±140.7），而长引拍单手反手击球的接触持续时间为（0.016±0.004秒），峰值合力冲击力为180.8±49.1牛。技能水平对峰值合力冲击力没有显著影响。
单手反手击球中的长引拍可能会减轻上肢负荷，并有助于降低与网球相关的上肢过度使用损伤的风险。
