Analysis of muscle activation during sedentary positions in different upper extremities in office workers

Objectives: The goal of this research was to evaluate changes in trunk and upper extremity muscle activity throughout various sedentary postures (hands rest on the table (ST), Shoulder’s lift (SU), shoulder forward (SF), shoulder backward (SB), head forward (HF) and head backward (HB)). Method: Thirteen people were chosen to evaluate the activity of the pectoralis major (PM), upper trapezius (UT), middle trapezius (MT), and posterior deltoid (PD). One-way ANOVA was conducted to determine the difference in muscle activity in various postures. Tukey's test was used as a post-test to evaluate variance, with a significance of 0.05. (SPSS Version 22.0). Findings: There were significant changes in pectoralis major, upper trapezius, middle trapezius, and posterior deltoid during the various sedentary positions. The pectoralis major showed higher muscle activity (65-70%, p ≤ 0.05) in the SF and PD postures. The upper trapezius showed higher muscle activity (75-80%, p ≤ 0.05) during SU posture, and the middle trapezius showed higher muscle activity (55-60%, p ≤ 0.05) during SB posture. Conclusions: According to the findings of this study, muscle activity varies depending on posture, and there is a significant effect on muscles during all postures.