Applied Kinesiology and Ergonomic Technology Laboratory, Department of Physical Therapy, The Graduate School, Yonsei University, South Korea.
Applied Kinesiology and Ergonomic Technology Laboratory, Department of Physical Therapy, The Graduate School, Yonsei University, South Korea.
Hum Mov Sci. 2016 Feb;45:119-29. doi: 10.1016/j.humov.2015.11.016. Epub 2015 Nov 25.
Scapular dyskinesis, characterized by scapular downward rotation syndrome (SDRS) affects scapula-humeral rhythm and results in shoulder dysfunction. Previous study has led to the recommendation of standard shrug exercise to contend with SDRS and strengthen the upper trapezius (UT) muscle. However, few researchers have examined which shrug exercise is most effective. The aim of this research was to compare scapular kinematic changes and scapular rotator muscles activity across three different shrug exercises in SDRS. The amounts of scapular downward rotation were measured by a caliper and the scapular upward rotation angle was measured using two digital inclinometers. Surface electromyography was used to measure EMG amplitude from the UT, lower trapezius (LT), serratus anterior (SA), and levator scapula (LS). Seventeen subjects with SDRS were recruited for this study. The subjects performed three shrug exercises with 30° shoulder abduction (preferred shrug, frontal shrug, and stabilization shrug). The stabilization shrug showed a significantly greater scapular upward rotation angle compared with the preferred shrug (P=0.004) and frontal shrug (P=0.006). The UT activity was significantly greater in the frontal shrug than in the preferred shrug (P=0.002). The UT/LS muscle activity ratio was also significantly greater in the frontal shrug than in the preferred shrug (P=0.004). The stabilization shrug should be preferred to enhance the upward rotation angle. In addition, the frontal shrug can be used as an effective method to increase UT activity and to decrease LS activity in SDRS.
肩胛运动障碍，以肩胛下旋综合征（SDRS）为特征，影响肩胛盂肱节律并导致肩部功能障碍。先前的研究建议采用标准耸肩运动来对抗 SDRS 并加强上斜方肌（UT）。然而，很少有研究人员研究哪种耸肩运动最有效。本研究旨在比较三种不同耸肩运动在 SDRS 中对肩胛运动学变化和肩胛旋转肌活动的影响。通过卡尺测量肩胛下旋量，使用两个数字测斜仪测量肩胛上旋角度。表面肌电图用于测量 UT、下斜方肌（LT）、前锯肌（SA）和肩胛提肌（LS）的肌电振幅。本研究招募了 17 名患有 SDRS 的受试者。受试者进行了三种 30°肩外展的耸肩运动（首选耸肩、额状面耸肩和稳定耸肩）。与首选耸肩（P=0.004）和额状面耸肩（P=0.006）相比，稳定耸肩的肩胛上旋角度明显更大。额状面耸肩时 UT 活动明显大于首选耸肩（P=0.002）。额状面耸肩时 UT/LS 肌肉活动比也明显大于首选耸肩（P=0.004）。为了增加上旋角度，应首选稳定耸肩。此外，在 SDRS 中，额状面耸肩可以作为一种有效方法来增加 UT 活动并减少 LS 活动。
