| Autor: |
Middleton KJ; a Centre for Human and Applied Physiology, School of Medicine , University of Wollongong , Wollongong , Australia., Carstairs GL; b Land Division, Defence Science and Technology Group , Melbourne , Australia., Ham DJ; b Land Division, Defence Science and Technology Group , Melbourne , Australia. |
| Jazyk: |
angličtina |
| Zdroj: |
Ergonomics [Ergonomics] 2016 Sep; Vol. 59 (9), pp. 1242-50. Date of Electronic Publication: 2016 Jan 15. |
| DOI: |
10.1080/00140139.2015.1120888 |
| Abstrakt: |
This study investigated the effect of posture on lifting performance. Twenty-three male soldiers lifted a loaded box onto a platform in standing and seated postures to determine their maximum lift capacity and maximum acceptable lift. Lift performance, trunk kinematics, lumbar loads, anthropometric and strength data were recorded. There was a significant main effect for lift effort but not for posture or the interaction. Effect sizes showed that lumbar compression forces did not differ between postures at lift initiation (Standing 5566.2 ± 627.8 N; Seated 5584.0 ± 16.0) but were higher in the standing posture (4045.7 ± 408.3 N) when compared with the seated posture (3655.8 ± 225.7 N) at lift completion. Anterior shear forces were higher in the standing posture at both lift initiation (Standing 519.4 ± 104.4 N; Seated 224.2 ± 9.4 N) and completion (Standing 183.3 ± 62.5 N; Seated 71.0 ± 24.2 N) and may have been a result of increased trunk flexion and a larger horizontal distance of the mass from the L5-S1 joint. Practitioner Summary: Differences between lift performance and lumbar forces in standing and seated lifts are unclear. Using a with-in subjects repeated measures design, we found no difference in lifted mass or lumbar compression force at lift initiation between standing and seated lifts. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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