A Study of Static Sitting Postures on Lumbar Muscles by using EMG
Sitting posture is most common to most office organizations, electrical, electronic and light assembly workplaces. Lumbar flexion measurement in sitting posture is important to evaluate the ergonomics comfort at workplaces to maintain the kyphotic posture (curving of spine) while seated for long periods which has been related to low-back pain due to an increase in intervertebral disc pressure. The discomfort of the lumbar back contributes greatly to the general discomfort in sitting posture, and this discomfort is related to the level of trunk flexion and mobility of the lumbar spine. The purpose of the study is to analyze the effect of lumbar muscles on static sitting postures in four different types of postures using electromyography. The process of data acquisition is controlled by means of specific software (MyoResearch), which enables the selection of the sampling frequency and the time of measurement. The levels of comfort were observed for each type of posture. Ten healthy subjects (Five females and five males) participated in this study. The subjects were required to sit on an office chair with four different postures for 15 minutes. Six different muscles which are right and left lumbar erector spinae, right and left thoracic erector spinae, and right and left multifidii were analyzed. Borg General Scale was also used to rank the level of discomfort. The results showed that left multifidii muscle is the most affected muscle during static sitting for all types of postures examined. The most comfortable sitting posture analyze from Borg General scale is posture 3. In addition, the statistical analysis (EMG) showed a significant difference between male and female (p<0.05) for all group of postures. It is indicated that gender was the important factor that influenced the EMG results of lumbar muscles.
static sitting posture lumbar muscle EMG
Siti Zawiah Md Dawal Mirta Widia Al-Hazizey Azmy Adibah Aimi Jawami Hilma Raimona Zadry
Department of Engineering Design and ManufactureUniversity of Malaya, Kuala Lumpur, 50603, MALAYSIA Department of Engineering Design and Manufacture 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
1-6
2009-08-09（万方平台首次上网日期，不代表论文的发表时间）