Leong Hio Teng, Ng Gabriel Yin-Fat, Chan Shing Chung, Fu Siu Ngor
Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region; Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong Special Administrative Region.
Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region.
J Electromyogr Kinesiol. 2017 Aug;35:40-46. doi: 10.1016/j.jelekin.2017.05.009. Epub 2017 May 30.
Athletes with rotator cuff (RC) tendinopathy demonstrate an aberrant pattern of scapular motion which might relate to deficits in the scapular muscles. This study aimed to determine whether alteration in scapular kinematics is associated with deficits in the activity onset of scapular muscles. Forty-three male volleyball players (17 asymptomatic and 26 with RC tendinopathy) joined the study. Three-dimensional scapular kinematics was quantified using an acromial marker cluster method. The activity onset of the upper (UT), middle (MT), and lower trapezius (LT), and serratus anterior (SA) during arm abduction was assessed with electromyography. Athletes with RC tendinopathy demonstrated less scapular upward rotation (6.6±2.3 vs. 8.2±1.1°, p=0.021) in the early phase of shoulder abduction from 0° to 30° when compared to asymptomatic athletes. The tendinopathy group had delayed activity onset of LT (14.1±31.4ms vs. 74.4±45.1ms, p<0.001) and SA (-44.9±26.0ms vs. 23.0±25.2ms, p<0.001) relative to UT when compared to the asymptomatic group. In asymptomatic athletes, earlier activity onset of MT and LT relative to UT was associated with more scapular upward rotation during 0-30° of abduction (r=0.665, p=0.021) and 30-60° of abduction (r=0.680, p=0.015), respectively. Our findings showed the control of the scapular upward rotation is related to the activity onset of the scapular muscles in athletes.
患有肩袖（RC）肌腱病的运动员表现出异常的肩胛运动模式，这可能与肩胛肌肉功能缺陷有关。本研究旨在确定肩胛运动学的改变是否与肩胛肌肉活动起始的缺陷相关。43名男性排球运动员（17名无症状，26名患有RC肌腱病）参与了该研究。使用肩峰标记簇方法对三维肩胛运动学进行量化。通过肌电图评估手臂外展期间上斜方肌（UT）、中斜方肌（MT）、下斜方肌（LT）和前锯肌（SA）的活动起始。与无症状运动员相比，患有RC肌腱病的运动员在肩部外展从0°至30°的早期阶段肩胛向上旋转较少（6.6±2.3°对8.2±1.1°，p = 0.021）。与无症状组相比，肌腱病组的LT（14.1±31.4毫秒对74.4±45.1毫秒，p<0.001）和SA相对于UT的活动起始延迟（-44.9±26.0毫秒对23.0±25.2毫秒，p<0.001）。在无症状运动员中，MT和LT相对于UT更早的活动起始分别与外展0 - 30°（r = 0.665，p = 0.021）和外展30 - 60°（r = 0.680，p = 0.015）期间更多的肩胛向上旋转相关。我们的研究结果表明，运动员肩胛向上旋转的控制与肩胛肌肉的活动起始有关。
