Department of Biomechanics, University of Nebraska - Omaha, Omaha, NE, USA.
Department of Physical Therapy, Creighton University, Omaha, NE, USA.
Appl Ergon. 2020 Apr;84:103030. doi: 10.1016/j.apergo.2019.103030. Epub 2020 Jan 10.
Many workplace falls occur during tasks involving carrying a load with both hands. Successful balance and gait during bimanual load carrying may be attributed to the adaptability of a system to navigate changing environments (e.g. construction site). This study investigates how bimanual load carrying affects adaptability of balance and gait, using 0%, 5%, and 10% of body mass in 14 young adults. Regularity of balance, and measures of range and center of pressure distance, and gait measures of stride length and step width were quantified using sample entropy. When carrying 5% load, anterior-posterior balance became less adaptable relative to 0%. As load increased from 0% to 5%-10%, step width narrowed and variability increased significantly, indicating possible increased fall risk while walking. Healthy, young adults may be at an increased risk of falls when carrying a load due to a loss in adaptability in a dynamic workplace environment.
许多工作场所的跌倒发生在双手搬运负荷的任务中。在双手搬运负荷时保持平衡和步态稳定可能归因于系统适应变化环境（例如建筑工地）的能力。本研究通过 14 名年轻成年人，调查了双手搬运负荷如何影响平衡和步态的适应性，使用了 0%、5%和 10%的体重。使用样本熵量化了平衡的规律性，以及压力中心距离的范围和中心的测量值，以及步态测量值的步长和步宽。当搬运 5%的负荷时，相对于 0%，前后平衡的适应性降低。随着负荷从 0%增加到 5%-10%，步宽变窄，变异性显著增加，这表明在行走时可能增加了跌倒的风险。健康的年轻人在动态工作环境中搬运负荷时可能面临更高的跌倒风险，因为他们的适应性丧失。
