Comparison of Maximum Voluntary Contraction Positions for Serratus Anterior Muscle in Men with Scapular Dyskinesis: Electromyography Analysis

Background: the purpose of this study was to quantify the surface emg activityof the serratus anterior muscle during two main test positions performed withthe maximum effort by the subjects with scapular dyskinesis.methods: this cross-sectional study included 30 men (aged 18 to 28) whowere suffering from scapular dyskinesis. scapular dyskinesis was measured byscapular dyskinesis test and surface emg was employed to record the emgactivity of the serratus anterior during two common positions of maximalvoluntary isometric contraction.results: the results revealed that there is no significant difference in the meanemg activity of the serratus anterior muscle during two mvic testing positions(p=0.846). notably, the test-retest icc scores for the emg recordings duringposition 1 (p=0.97) and position 2 (p=0.96) were excellent.conclusion: it was found that no one muscle test produced the highest mvicfor all subjects. therefore, to perform normalization of every muscle within eachsubject, it is suggested that two tests identified in this study be performed whichusually produce high levels of emg activity.