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首页> 外文期刊>International Journal of Industrial Ergonomics >Effect of straddle stance and dominance on limb loading asymmetries when lifting
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Effect of straddle stance and dominance on limb loading asymmetries when lifting

机译：跨立姿​​势和优势对举起时肢体负荷不对称的影响

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摘要

A straddle stance is often prescribed when lifting a box from the floor. The goal of this study was to assess the effects of stance on the lower limb load distribution when lifting a crate from the floor to standing hip height. Eighteen healthy young adult men (n = 9) and women (n = 9) with dominant right leg (i.e., preferred kicking leg) volunteered [age = 22.0 ± 1.0 yrs (mean ± SD), height = 171.2 ± 8.8 cm, body mass = 66.2 ± 10.0 kg]. After practice and warm up, five lifts (men = 17 kg, women = 12 kg) were performed in each of three separate stances: dominant foot forward (DFF), non-dominant foot forward (NDFF) and a symmetric (SYM). Limb loading was quantified as the percent of the average total vertical force under each foot from the start of the counter movement through completion of the limb extension after picking up the crate. Overall, limb loading asymmetries were greater when lifting with the DFF than SYM stance with neither different from the NDFF stance [main effect p = 0.011: DFF = 7.0 ±6.3, NDFF = 4.8 ± 5.1, SYM = 2.5 ± 1.5 abs|D%-ND%|]. When examining the load distribution between the D and ND sides, all three lifting conditions were significantly different from each other [p < 0.001: DFF = -6.9 ± 6.4, NDFF = 2.1 ± 6.8, SYM = -1.3 ± 2.6 D%-ND%]. There was also a significant difference between DFF and NDFF asymmetries when compared as trail and lead leg [p = 0.011: DFF = 6.9 ± 6.4, NDFF = 2.1 ± 6.8 Trail%-Lead%]. However, after adjusting for the asymmetry present during SYM stance lifting, where subjects placed significantly more load on their ND foot [p = 0.038], the trail limb was preferentially loaded more than the lead limb in each of the straddle stance conditions with no difference between DFF and NDFF [p = 0.204: DFF = 5.5 ± 6.1, NDFF = 3.5 ± 6.8 Trail%-Lead%]. Repeat measures on eight subjects were consistent with initial visits (Chronbach's Alpha ≥ 0.789). When surveyed on which asymmetric lift they preferred, 67% chose the DFF stance. Based on these results, there is a tendency to place more weight on the trailing limb when lifting with a straddle stance. However, this is heavily mitigated in the NDFF stance. Relevance to industry: While not preferred by most subjects, the NDFF straddle stance should be used in an attempt to minimize any potential limb loading differential. However, if the load is heavy, awkwardly shaped requiring a large straddle or multiple repetitions, it might be most appropriate to switch lead legs from lift to lift.
机译：从地板上抬起箱子时，通常会规定跨骑姿势。这项研究的目的是评估将板条箱从地板抬起至站立时髋部高度时，姿势对下肢负荷分布的影响。 18名健康的年轻成年男性（n = 9）和女性（n = 9）的右腿处于支配地位（即首选踢腿）[年龄= 22.0±1.0岁（平均±SD），身高= 171.2±8.8 cm，身体质量= 66.2±10.0千克]。经过练习和热身后，以三种独立的姿势分别进行了五次抬举（男性= 17公斤，女性= 12公斤）：优势足向前（DFF），非优势足向前（NDFF）和对称（SYM）。肢体负荷被量化为从反击运动开始到捡起板条箱后肢体伸展完成在每只脚下平均总垂直力的百分比。总体而言，用DFF抬起时肢体负荷的不对称性大于SYM姿势，而与NDFF姿势没有差异[主效应p = 0.011：DFF = 7.0±6.3，NDFF = 4.8±5.1，SYM = 2.5±1.5 abs | D％ -ND％|]。在检查D侧和ND侧之间的载荷分布时，所有三个提升条件都显着不同[p <0.001：DFF = -6.9±6.4，NDFF = 2.1±6.8，SYM = -1.3±2.6 D％-ND ％]。与尾迹和前腿相比，DFF和NDFF不对称性之间也存在显着差异[p = 0.011：DFF = 6.9±6.4，NDFF = 2.1±6.8 Trail％-Lead％]。但是，在调整了SYM姿势抬起过程中存在的不对称性之后，受试者在其ND脚上施加了明显更多的负载[p = 0.038]，在每种跨骑姿势条件下，后肢的负载优先于前肢，没有差异在DFF和NDFF之间[p = 0.204：DFF = 5.5±6.1，NDFF = 3.5±6.8 Trail％-Lead％]。对八名受试者的重复测量与初次就诊相一致（克伦巴赫Alpha≥0.789）。在调查他们偏爱哪种不对称举升时，有67％的人选择了DFF姿势。基于这些结果，当以跨骑姿势抬起时，倾向于在后肢上施加更多的重量。但是，这在NDFF立场上得到了很大的缓解。与行业的相关性：尽管大多数受试者不喜欢NDFF跨骑姿势，但应尽量减少任何潜在的肢体负荷差异。但是，如果负载重，形状笨拙而需要较大的跨度或多次重复，则最合适的做法是将引线腿从一个升降机切换到另一个升降机。

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