Liberty Mutual Research Institute for Safety, 71 Frankland Road, Hopkinton, MA 01748, USA.
Appl Ergon. 2010 May;41(3):484-9. doi: 10.1016/j.apergo.2009.10.004. Epub 2009 Nov 18.
The effects of single-handed load holding, length of the base of support, and standing surface condition (narrow and wide construction beams) on balance were investigated in twenty-three healthy men between the ages of 18 and 55 years old. Balance during quiet standing was evaluated from postural sway measurements derived from center of pressure (COP) displacement. These measurements included the range or maximal displacement of the COP in the anteroposterior (AP) and mediolateral (ML) directions, the elliptical area, and mean sway velocity. Holding a load in the hand did not significantly affect postural sway measures (p > 0.05), although the effect of surface condition was significant on all COP measures (p < 0.001). Lengthening the base of support did not affect the ranges or elliptical area, but increased the mean velocity of sway (p = 0.001). Changes in the dimensional characteristics of the surface condition and length of base of support affected postural sway, possibly by requiring adjustments to balance and motor control strategies. Further research is required to determine if these changes are detrimental to maintaining balance and increase the risk of falls for workers in similar environments.
研究了单手持物、支撑基底长度和站立表面条件（窄和宽的建筑梁）对 23 名年龄在 18 至 55 岁之间的健康男性平衡的影响。通过从压力中心（COP）位移得出的姿势摆动测量来评估安静站立时的平衡。这些测量包括 COP 在前后（AP）和内外（ML）方向上的最大位移范围，椭圆区域和平均摆动速度。手持重物对姿势摆动测量没有显著影响（p>0.05），尽管表面条件对所有 COP 测量都有显著影响（p<0.001）。延长支撑基底长度不会影响范围或椭圆面积，但会增加摆动的平均速度（p=0.001）。表面条件和支撑基底长度的尺寸特征变化会影响姿势摆动，可能需要调整平衡和运动控制策略。需要进一步研究以确定这些变化是否对维持平衡有害，并增加类似环境中工人跌倒的风险。
