12 0 0 0 OA 肩関節屈曲 • 外転における肩甲骨周囲筋の筋活動パターン ∼ 鎖骨肩甲上腕リズムに着目して ∼
- 著者
- 森原 徹 小椋 明子 立入 久和 久保 俊一 黒川 正夫 三浦 雄一郎 福島 秀晃
- 出版者
- 日本肩関節学会
- 雑誌
- 肩関節 (ISSN:09104461)
- 巻号頁・発行日
- vol.35, no.3, pp.715-718, 2011 (Released:2011-12-21)
- 参考文献数
- 8
- 被引用文献数
- 3
In the motion of shoulder flexion(0-90 degree), the scapula was upward rotated at the center of acromioclaviclular joint. In the abduction, the scapula was upward rotated and depressed with the clavicle elevation and retraction. The purpose of this study is to evaluate the muscle functions around the scapula by electromyographic analysis during the flexion and abduction of the shoulder. EMG activities of upper, middle, and inferior trapezius muscle, and serratus anterior, were examined in 5 static positions from 0 degrees to 150 degrees for 5 seconds in each position during exercises of shoulder flexion and abduction in 6 healthy volunteers. We used Telemyo System 2400(Noraxon USA Inc) and analyzed by MyoVideo and MyoResearch. The relative activity of upper trapezius muscle did not increase, and the muscle activity of serratus anterior was increased significantly during the early phase of flexion. The relative activity of upper, middle trapezius muscle has gradually increased during the early phase of abduction. The scapular upward rotation pattern was different between that in flexion and abduction. This study indicated that the symptom of accessory nerve palsy is disorder of abduction, and the main symptom of long thoracic nerve palsy is the inhibition of shoulder flexion.
4 0 0 0 OA 肩すくめ動作における棘上筋 • 棘下筋の筋活動
- 著者
- 立入 久和 森原 徹 仲川 春彦 木田 圭重 祐成 毅 堀井 基行 久保 俊一 三浦 雄一郎 福島 秀晃 黒川 正夫
- 出版者
- 日本肩関節学会
- 雑誌
- 肩関節 (ISSN:09104461)
- 巻号頁・発行日
- vol.35, no.3, pp.719-722, 2011 (Released:2011-12-21)
- 参考文献数
- 9
- 被引用文献数
- 3
Shrug exercise, which is one of the treatments for stiff shoulder and rotator cuff tear, is commonly performed. This exercise is also performed to relax the shoulder after surgery for rotator cuff repair. The effectiveness of shrug exercise for the rotator cuff has not been analyzed. The purpose of this study was to analyze the shrug exercise and to evaluate the usefulness of the shrug. Five asymptomatic male volunteers who had no history of shoulder abnormalities were examined. SSP (supraspinatus) muscle was measured by fine-wire electrodes and ISP (infraspinatus) muscle was measured by surface electrodes. At the time of non-shrug (group N) and shrug (group S), %MVC (maximal voluntary contraction) was calculated in the position of 0, 30, 60, 90 degrees flexion. %MVC of SSP in the position of 0,30,60,90 degrees flexion were 2,8,13,15% in group N, and 32,35,23,32% in group S. %MVC of SSP were increased at each angle. %MVC of ISP were 6,16,25,38% in group N, and 10,17,25,42% in group S. It has been reported that %MVC over 20% is high activity. %MVC of SSP showed over 20% at shrug position in this study, which was considered that shrug motion caused eccentric contraction of SSP muscle with the scapula elevating. From this study, it is considered that shrug excise is useful for cuff training, but may be overloaded on SSP in the early stage after surgery.