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The Muscle Fatigue Analysis Associated with Using Various Stretchers
Myung Kug Moon,Day Sung Kim,Kyoo Sang Kim,Yeon Ju Oh,Chol Hong Kim 한국산업경영시스템학회 2013 한국산업경영시스템학회 학술대회 Vol.2013 No.춘계
The purpose of this study was to provide a practical guide to the use of various stretchers that rescue workers use by analyzing muscle fatigue degree associated with lifting a patient. The experiment was conducted with working male and female rescue crews. Having mixed groups of gender complete tasks such as lifting, moving, and unloading a patient using four different types of stretcher, we recorded each muscle fatigue degree in the shoulder and lower back regions of each subject. The data showed, in terms of muscle activity, differences within each group of genders and its combinations were significant in certain muscle groups depending on the types of stretcher used and body sizes of each subject, and, when it comes to Elerctor Spenae, the female subjects used more muscular strength than the males did. In regards to the muscle fatigue degree, there was no significant difference found within each group of the genders, body sizes, and their combinations. However, in the case of applying different models of stretcher, there were significantly differences in the fatigue degree.
( Myung-kug Moon ),( Chol-hong Kim ),( Seok-jin Lim ) 대한설비관리학회 2020 대한설비관리학회지 Vol.25 No.4
A laboratory experiment was conducted to investigate the effects of working positions and handle types on maximum push/pull forces and muscular activities for Korean males and females. Fifteen male and fifteen female university students, in good health, participated as subjects in the experiment. Each subject performed push/pull task at six different working positions while using three different handle types. The results of experiment indicated that, for both male and female magnitude of push/pull forces were affected by both working positions and handle types. The average pushing forces were 342.57 N-m for males and 176.86 N-m for females. And the average pulling forces were 279.46 N-m for males and 147.03 N-m for females. Also, average pushing force of females was 51.6% of that of males, and pulling force of female was 52.6% of that of males. This ratio of muscular force of female’s and male’s was consistent with previous research revealing that existing guidelines in ergonomics field should be reconsidered with respects to racial and cultural differences. EMG analysis was performed on four different muscles : (deltoid-midium, pectoralis major, elector spinae, gastrocnemius-lateral). The EMG result showed that the recruitment patterns of four muscles were affected by working positions. Elector spinae was recruited more in males than females in pushing task, and gastrocnemius-lateral was recruited more in females than males in pulling task. The results of this study indicate and recommend that Push/Pull task in the industry should be designed with respect to different working conditions as well as racial and cultural differences.