Wei Shun-Hwa, Chiang Jinn-Yen, Shiang Tzyy-Yuang, Chang Hsiao-Yun
Graduate Institute of Rehabilitation Science and Technology, National Yang Ming University, Taipei, Taiwan, ROC.
Clin J Sport Med. 2006 Mar;16(2):129-35. doi: 10.1097/00042752-200603000-00008.
To test the hypothesis that recreational tennis players transmit more shock impact from the racket to the elbow joint than experienced tennis players during the backhand stroke. Also, to test whether recreational tennis players used higher electromyographic (EMG) activities in common wrist extensor and flexor around epicondylar region at follow-through phase.
A repeated-measure, cross-sectional study.
National College of Physical Education and Sports at Taipei, Taiwan.
Twenty-four male tennis players with no abnormal forearm musculoskeletal injury participated in the study. According to performance level, subjects were categorized into 2 groups: experienced and recreational.
Impact transmission and wrist extensor-flexor EMG for backhand acceleration, impact, and follow-through phases were recorded for each player. An independent t test with a significance level of 0.05 was used to examine mean differences of shock impact and EMG between the 2 test groups. One-way ANOVA associated with Tukey multiple comparisons was used to identify differences among different impact locations and EMG phases.
Experienced athletes reduced the racket impact to the elbow joint by 89.2%, but recreational players reduced it by only 61.8%. The largest EMG differences were found in the follow-through phase (P<0.05). Experienced athletes showed that their extensor and flexor EMGs were at submaximal level for follow-through phase, whereas recreational players maintained their flexor and extensor EMGs at either supramaximal or maximal level.
Our results support the hypothesis that recreational players transmit more shock impact from the racket to the elbow joint and use larger wrist flexor and extensor EMG activities at follow-through phase of the backhand stroke. Follow-through control is proposed as a critical factor for reduction of shock transmission. Clinicians or trainers should instruct beginners to quickly release their grip tightness after ball-to-racket impact to reduce shock impact transmission to the wrist and elbow.
验证休闲网球运动员在反手击球时比有经验的网球运动员将更多的球拍冲击传递至肘关节的假设。同时，验证休闲网球运动员在随挥阶段肱骨髁上区域周围的常见腕伸肌和屈肌是否使用了更高的肌电图（EMG）活动。
重复测量的横断面研究。
台湾台北国立体育学院。
24名无前臂肌肉骨骼损伤异常的男性网球运动员参与了该研究。根据表现水平，受试者被分为两组：有经验的和休闲的。
记录每位运动员反手加速、击球和随挥阶段的冲击传递和腕伸肌 - 屈肌EMG。使用显著性水平为0.05的独立t检验来检查两个测试组之间冲击和EMG的平均差异。使用与Tukey多重比较相关的单因素方差分析来确定不同冲击位置和EMG阶段之间的差异。
有经验的运动员将球拍对肘关节的冲击降低了89.2%，但休闲运动员仅降低了61.8%。在随挥阶段发现最大的EMG差异（P<0.05）。有经验的运动员表明，他们在随挥阶段伸肌和屈肌的EMG处于次最大水平，而休闲运动员在随挥阶段将其屈肌和伸肌的EMG维持在超最大或最大水平。
我们的结果支持以下假设，即休闲运动员在反手击球的随挥阶段将更多的球拍冲击传递至肘关节，并使用更大的腕屈肌和伸肌EMG活动。建议将随挥控制作为减少冲击传递的关键因素。临床医生或教练应指导初学者在球与球拍碰撞后迅速松开紧握的力度，以减少冲击传递至手腕和肘部。
