지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2014.5
- 수록면
- 331 - 335 (5page)
이용수
초록· 키워드
오류제보하기
This study investigated the lifting loads beside the body compared to in front of the body. Lumbar spinal load during manual lifting is considered an important risk factor for the occurrence of work related back pain. The lumbar spinal load can be expected to increase while manual lifting in front of body compared to beside the body. The horizontal distance of the combined load relative to the low back can be reduced to zero with manual lifting beside the body. Many researchers want to collect quantitative data like low back muscle activities and lumbar loads for preventing back pain. Twenty healthy young men symmetrically lifted hand loads beside the body and in front of the body. The hand loads considered were 0, 6.5, 11.5, and 16.5 kg. Using digital human modeling (DHM) software magnitude of the low-back loads was estimated. The estimated lumbar spinal loads were moment, compression, and joint shear about L4/L5. Subjects’ anthropometric details were used to model digital human in the DHM software. The electromyography was used to measure the symmetry of erector spinae muscle activity (between right and left side) during manual lifting with in front of body and beside body. Specifically, muscle activities obtained with surface electromyography were processed with standard root-mean-square (RMS) amplitude calculations. Finally, the foot balance during manual lifting for the selected postures was measured with foot analyzer. The overall foot balance in the front, back, right, and left side of the body were estimated. Extensor moment was increased with hand loads when lifting in front of the body. Flexor moment was increased with hand loads when lifting beside the body. For the in front of the body lifting technique, the lumbar spinal load values were significantly (p < 0.05) greater than lifting beside the body. There was a significant difference (p < 0.05) in the lumbar spinal loads between the selected postures and for the hand loads. The RMS of erector spinae muscle was significantly (p < 0.05) greater when lifting in front of the body. The comparison of RMS values between the sides of the erector spinae muscle activity reveals that the left side muscle activity was greater than the right side. The foot balance map reveals that significantly (p < 0.05) greater force produced by the left side foot compared with right side to maintain balance when increased hand loads. And also there was a significant (p < 0.05) interaction effect between lifting posture and hand loads in the right side foot balance. The current study showed that lifting a symmetrical load beside the body did reduce lumbar spinal loads and erector spinae muscle activities; this was probably due to the reduced horizontal distance between the hand loads and low back (L4/L5).
목차
ABSTRACT
1. Introduction
2. Method
3. Results
4. Conclusion
References
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UCI(KEPA) : I410-ECN-0101-2016-530-002490333