Muscle activity and spinal loading in lifting symmetrical loads beside the body compared to in front of the body

다국어 초록 (Multilingual Abstract)

Digital human modeling enables engineers in product development to address questions of ergonomics and human factors early on inthe development. To build more accurate Digital human models (DHMs), the physiological standard reference data are necessary. Weinvestigated the effects of lifting loads beside the body compared to in front of the body. Forty healthy subjects performed eight liftingtasks with combinations of two postures, and four loads. The magnitude of the erector spinae muscle activity: Median frequency (MF)and Normalized root-mean-square (N-RMS) was estimated using surface electromyography. The magnitude of the lumbar spinal loadsabout lumbar vertebrae was estimated using DHM software. The effect of the moment arms (5, 6, 7.5 and 8.5 cm) on the lumbar spinalloads was estimated biomechanically. Lifting loads beside the body significantly (p < 0.01) reduced the muscle fatigue, muscle activity,and spinal loads. The increased moment arms resulted in the reduction of compression (5-13%) and muscle force (16-41%). The resultpresented in this study could be used to build more accurate DHMs.

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