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http://dx.doi.org/10.5762/KAIS.2012.13.10.4629

Comparison of Peak EMG Amplitude on Low Back Muscles according to Asymmetric Load Center of Gravity and Trunk Lateral Bending while Lifting  

Han, Seung Jo (Department of Industrial Engineering, Dankook University)
Kim, Sun-Uk (Department of Industrial Engineering, Dankook University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.13, no.10, 2012 , pp. 4629-4635 More about this Journal
Abstract
This study was aimed at the relationship between peak EMG amplitude on low back muscles acting on L5/S1 and load center of gravity, trunk lateral bending while lifting an object. Musculoskeletal disorders including low back pain can occur even when handling heavy objects only once as well as when doing non-heavy materials repeatedly. 11 male subjects with average 23 age were required to lift a 15.8kg object symmetrically three times. Peak EMG amplitudes on 6 muscles related with L5/S1 were recorded and analyzed. The lifting conditions consisted of lifting symmetric load with no trunk lateral bending, asymmetric load with no trunk lateral bending, and asymmetric load with trunk lateral bending to the load center of gravity within an object. The results showed that peak EMG amplitude on back muscles contralateral to load center of gravity was observed greater in comparison with the symmetric load. Also, in case of lifting asymmetric load the posture with trunk lateral bending increased peak EMG amplitude on muscles contralateral to load center of gravity more than with no trunk lateral bending. This research can be used as one administrative intervention in order to reduce the low back pain incidence with suggesting workers that they keep the trunk not bending to load center of gravity if possible when lifting a heavy asymmetric object.
Keywords
Asymmetric Load; Load Center of Gravity; Low Back Muscles; Peak EMG Amplitude; Trunk Lateral Bending;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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