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
- 2013.10
- 수록면
- 19 - 23 (5page)
이용수
초록· 키워드
오류제보하기
Objective: Effective estimates of internal spinal loading using biomechanical models are dependent on the accuracy of anatomical inputs, such as a muscle moment arm. In this study, the effects of the moment arms on the internal spinal loads were estimated during manual material handling tasks with a variety of postures. Background: Biomechanical models of the humans have been developed to predict the magnitude and pattern of spine loading during task performance. Accurate anatomical inputs for biomechanical models are necessary for valid estimates of internal spinal loading. Usually the extensor muscular and ligament forces of the lumbar spine are assumed to act 5 cm posterior (i.e., moment arm) to a disc centre of rotation. However, different moment arms (6, 7.5, and 8.5 cm) have been considered in the biomechanical studies. Method: In this study, the lumbar erector spinae moments (L4/L5 moment) during manual material handling with a variety of postures were estimated using a commercially available biomechanical model. Symmetrical hand loads considered for the tasks were 0 ? 25 kg with 5 kg increments. Postures considered for the tasks were upright (0 degree) and stooped standing posture (10, 20, and 30 degrees). The muscle forces and disc compression forces about L4/L5 point were calculated from the estimated L4/L5 moment for the different moment arms. Results: When the load increases, flexor moment increases for upright posture and extensor moment decreases for the stooped standing postures. When the stooping angle increases, extensor moment increases to load. When the moment arm was higher (8.5 cm), the muscle forces were lower for the postures comparing with smaller moment arms (5, 6, and 7.5 cm). Similarly, when the moment arm was higher, the disc compression forces were also lower for the postures. Statistically significant difference (p < 0.05) was found in the muscle forces and disc compression forces between the moment arms. Conclusion: With the author’s knowledge to calculate internal spinal loads, there is no standard moment arm available and may need further studies or standard for moment arm. Application: Effective estimates of internal spinal loads would be useful for calculating recommended weights for manual lifting tasks.
목차
ABSTRACT
1. Introduction
2. Method
3. Results and Discussion
4. Conclusions
References
참고문헌 (0)
참고문헌 신청이 논문의 저자 정보
최근 본 자료
댓글(0)
0