The effect of floor slope on sub-maximal lifting capacity and technique.
The effect of floor slope on sub-maximal lifting capacity and technique.
复制标题
底板坡度对次最大起重能力和技术的影响。
DOI：
10.1016/j.apergo.2007.10.004
复制
发表时间：
2008
影响因子：
3.2
通讯作者：
Reiser2nd,RaoulF
中科院分区：
文献类型：
--
作者：
Wickel,EricE;Reiser2nd,RaoulF
在工作现场的情况下，可能会遇到升降机和负载都在斜坡上的倾斜表面。本研究的目的是确定是否面对向上或向下的斜面（10°和20°）将影响最大可接受的重量的电梯（MAWL）使用10分钟的心理物理方法与对称的自由泳技术在4升降机/分钟。17名健康男性和18名女性确定地板到指关节高度MAWL，而面对上坡，下坡，并在水平表面上。还进行了运动捕捉，以检查矢状面关节角度和相对于牛奶箱的足部放置。坡度并没有改变MAWL（p>0.05），在每种情况下，男性举起的重量都比女性多（p<0.001）（分别为25 kg和15 kg）。脚相对于箱子的位置被坡度改变，使得箱子后面的水平位置和箱子下面的垂直位置随着坡度从下坡到上坡条件的改变而增加（均p<0.001）。当坡度从下坡变为上坡时，躯干前倾以及髋关节、膝关节和踝关节（足底）屈曲通常会降低（所有p<0.001）。躯干和膝关节的运动似乎受到保护相比，其他关节，变化最少。虽然两性的趋势相同，但在垂直脚位和髋角方面确实存在相互作用（均p <0.001）。总之，身体对地板坡度的适应性很强，至少在短期内保持MAWL。然而，尽管男性和女性之间存在轻微的技术差异，但所有人都应该注意，当面对上坡时，由于倾向于水平站立，而不是由于躯干倾斜增加而面临下坡时。
Inclined surfaces, where both the lifter and load are on the slope, may be encountered in a jobsite situation. The purpose of this study was to determine if facing up or down a sloped surface (10° and 20°) would affect maximal acceptable weights of lift (MAWL) using a 10min psychophysical approach with symmetric freestyle technique at 4lifts/min. Seventeen healthy men and 18 women determined floor to knuckle height MAWL while facing uphill, downhill, and on a level surface. Motion capture was also performed to examine sagittal plane joint angles and foot placement relative to a milk crate. Slope did not alter MAWL (p>0.05) with the men lifting more than the women in every condition (p<0.001) (25kg vs. 15kg, respectively). Foot placement relative to the box was altered by slope such that both horizontal position behind and vertical position below the box increased as slope changed from the downhill to uphill conditions (both p<0.001). Forward torso lean as well as hip, knee, and ankle (plantar) flexion generally decreased as slope changed from the downhill to uphill conditions (all p<0.001). Torso and knee motion appeared to be protected compared to the other joints, changing the least. Though trends were the same in both sexes, interactions did exist in vertical foot position and hip angle (both p⩽0.001). In conclusion, the body is highly adaptive to floor slope, maintaining MAWL at least in the short term. However, while slight technique differences exist between men and women, care should be taken by all when facing uphill due to the tendency to stand further from the load horizontally and when facing downhill due to increased torso lean.