Influence of body segment dynamics on loads at the lumbar spine during lifting
| Autor: | Yang Hwei Tsuang, O. D. Schipplein, Gunnar B. Andersson, J. H. Trafimow |
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| Rok vydání: | 1992 |
| Předmět: |
Adult
Male Lumbar Vertebrae business.industry media_common.quotation_subject Physical Exertion Dynamics (mechanics) Biomechanics Physical Therapy Sports Therapy and Rehabilitation Human Factors and Ergonomics Moment magnitude scale Structural engineering Static analysis Inertia Biomechanical Phenomena Moment (mathematics) Lift (force) Reference Values Fictitious force Humans Hip Joint business Simulation media_common Mathematics |
| Zdroj: | Ergonomics. 35:437-444 |
| ISSN: | 1366-5847 0014-0139 |
| DOI: | 10.1080/00140139208967824 |
| Popis: | Flexion-extension moments acting at the L5/S1 level and hip joints were calculated using three different techniques; a pure static analysis, a static analysis including the inertial force of the load, and a dynamic analysis. Ten subjects participated in the study and were asked to lift a box weighing either 50 N or 150 N, using a freestyle technique. The lifts were performed at normal and fast speed. The intra-subject lifting techniques were consistent when lifting the same loads. The moments predicted by the dynamic analysis and the static analysis were the same when holding weights in static postures. When performing the lifts, differences in the peak moments occurred between static and dynamic analyses. These differences were influenced by external load and by lifting speed. Taking the effect of the inertia of load into account in the static analysis resulted in an increase in the moment magnitude, but the predicted moment was still much less than in the dynamic analysis which yielded the largest moment magnitudes. The difference between dynamic and static analysis was greatest when lifting 50 N at fast speed; an 87% increase in L5/S1 moment and a 95% increase in hip moment was observed when replacing the pure static with a dynamic analysis. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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