Lee Sangyong, Lee Daehee, Park Jungseo
Department of Physical Therapy, Youngdong University.
J Phys Ther Sci. 2013 Aug;25(8):981-4. doi: 10.1589/jpts.25.981. Epub 2013 Aug 20.
[Purpose] The purpose of this study was to determine the effect of hand position changes on electromyographic activity of shoulder stabilizers during push-up plus exercise (PUPE) performed on both stable and unstable surfaces. [Subjects] This study was performed on a cohort of 20 normal adults divided into an unstable surface group (USG) (n=10) and a stable surface group (SSG) (n=10). [Methods] A sling device was used to provide an unstable surface, and a push-up bar was used to provide a stable surface. PUPEs were performed with hands in various positions: the neutral position (NP), the internal rotation position (IRP), or the external rotation position (ERP). Electromyography was used to determine and analyze the electromyographic activity of the upper trapezius muscle (UT), the lower trapezius muscle (LT), the serratus anterior muscle (SA), and the pectoralis major muscle (PM). [Results] Comparison of the results within the USG and SSG showed significant differences depending on the hand position used during the exercise. Comparison between the USG and SSG showed that the ERP hand posture resulted in significant differences in electromyographic activity of the SA in the USG. [Conclusion] The electromyographic activity of the SA indicated that performing PUPEs using the ERP on an unstable surface provided more effective intervention for shoulder stabilization than ERP on a stable surface.
[目的]本研究旨在确定在稳定和不稳定表面上进行俯卧撑加运动（PUPE）时手部位置变化对肩部稳定肌肌电活动的影响。[对象]本研究对20名正常成年人进行，分为不稳定表面组（USG）（n = 10）和稳定表面组（SSG）（n = 10）。[方法]使用吊带装置提供不稳定表面，使用俯卧撑杆提供稳定表面。在手部处于不同位置时进行PUPE：中立位（NP）、内旋位（IRP）或外旋位（ERP）。采用肌电图来确定和分析斜方肌上束（UT）、斜方肌下束（LT）、前锯肌（SA）和胸大肌（PM）的肌电活动。[结果] USG和SSG内结果的比较显示，根据运动中使用的手部位置存在显著差异。USG和SSG之间的比较表明，ERP手部姿势导致USG中SA的肌电活动存在显著差异。[结论] SA的肌电活动表明，在不稳定表面上使用ERP进行PUPE比在稳定表面上使用ERP能为肩部稳定提供更有效的干预。
