Gender Differences in Upper Limb and Lower Back Muscle Activity during Prolonged Sitting
The incidence of muscle fatigue is high in workers doing repetitive task, during prolonged sitting. Current health and safety guidelines do not account for gender differences in fatigability and may be predisposing one gender to greater risk. This study aims to determine the disparity between gender with respect to upper limb and lower back muscle activity while performing a repetitive task in the near and far boundary work area during prolonged sitting. Subjects consisted of 10 males (age 27.7±5.42) and 10 females (age 27.5±5.91) with no history of musculoskeletal injury or back problem at the time of participation. All of them are right hand dominance and performed same repetitive task in near and far boundary work area in sitting position. The surface electromyography (EMG) signal was recorded from Right and Left Levator Scapulae, Right and Left Upper Trapezius, Right and Left Anterior Deltoid and Right and Left Erector Spinae which is known as the weakened and tightened muscles due to Musculoskeletal Disorders (MSD). The EMG signal was processed and normalized in the form of％MVC for analysis and comparison. The overall results showed that muscles activities on upper limb and lower back were increased significantly during prolonged sitting since the％MVC were increasing as the time increases in both boundaries working area. Females have the higher％MVC compared to males with average of 1.62％MVC in near and 2.0％MVC in far boundary work area. MVC％ was analyzed using SPSS v.16. The results significantly showed that gender affects the muscular activity on upper limb and lower back muscles during prolonged sitting.
Muscle Activity Prolonged Sitting Electromyography
Nurhayati MN Siti Zawiah Md Dawal
University of Malaya, Kuala Lumpur 50603, MALAYSIA
国际会议
17th World Congress on Ergonomics(第十七届国际人类工效学大会)
北京
英文
1-4
2009-08-09（万方平台首次上网日期，不代表论文的发表时间）