Department of Physical Therapy, The Graduate School, Inje University, Republic of Korea.
J Electromyogr Kinesiol. 2011 Oct;21(5):861-7. doi: 10.1016/j.jelekin.2011.07.001. Epub 2011 Jul 31.
No studies have examined the effects of an unstable surface on push-up and push-up plus exercises in terms of the two parts of the serratus anterior muscle. We hypothesized that the lower part of the serratus anterior would have greater activity with an unstable surface, which requires stabilizing the scapular position. The present study was performed to investigate the intramuscular differences between parts of the serratus anterior muscle during push-up and push-up plus exercises. Twelve healthy subjects were included in the study. The upper and lower parts of the serratus anterior and upper and lower parts of the trapezius were investigated by surface EMG during four types of exercise. Repeated one-way ANOVA was used for statistical analyses. Maintaining the push-up plus phase caused significant increases in EMG activity of the upper serratus anterior compared with the push-up ascending phase on both of stable and unstable bases (P<0.05). The lower serratus anterior showed increased activation on an unstable surface, which required more joint stability than did the stable base. Upper trapezius/upper serratus anterior ratio was significantly lower in the PUP than in the PUA phase with both stable and unstable bases of support (P<0.05). Further studies are required to investigate the intramuscular variation in activation of the serratus anterior during exercises for rehabilitation.
尚无研究考察在不稳定表面上进行俯卧撑和俯卧撑加练习对前锯肌两部分的影响。我们假设，需要稳定肩胛骨位置的不稳定表面会使前锯肌下部的活动更大。本研究旨在探讨俯卧撑和俯卧撑加练习中前锯肌各部分之间的肌内差异。本研究纳入了 12 名健康受试者。在四种运动中，通过表面肌电图研究了前锯肌的上、下部和斜方肌的上、下部。采用重复单向方差分析进行统计学分析。与稳定基础相比，在不稳定基础上进行俯卧撑加练习阶段时，前锯肌上部的肌电图活动明显增加（P<0.05），高于俯卧撑上升阶段。在不稳定表面上，下前锯肌的激活增加，这需要比稳定基础更多的关节稳定性。在稳定和不稳定的支撑基础上，与 PUA 阶段相比，PUP 阶段的上斜方肌/上前锯肌比值明显降低（P<0.05）。需要进一步的研究来探讨在康复练习中前锯肌激活的肌内变化。
