Rhea Christopher K, Wittstein Matthew W
Department of Kinesiology, University of North Carolina at Greensboro, Greensboro, NC.
J Appl Biomech. 2014 Aug;30(4):534-41. doi: 10.1123/jab.2013-0314. Epub 2014 Jun 30.
Much has been learned about the characteristics of gait in overground and treadmill walking. However, there are many contexts in which overground or treadmill walking might not be possible, such as in home-based physical therapy. In those cases, a surrogate task to index gait behavior would be a valuable tool. Thus, the purpose of this study was to evaluate the stride behavior characteristics of stationary stepping compared with treadmill walking. Healthy young adults (N = 10) preformed two 15-minute tasks: (1) treadmill walking and (2) stationary stepping. Several stride behavior characteristics were recorded, including the number of strides taken, minimum and maximum knee angle, stride interval mean, stride interval standard deviation, and detrended fluctuation analysis (DFA) alpha of the stride interval time series. The results showed that stride behavior was similar between tasks when examined at the group level. However, when individual level analyses were used to examine the reliability of each metric between tasks, poor reliability was observed in most metrics, indicating that stationary stepping may not be an appropriate surrogate task for overground or treadmill walking. These results are discussed in the context of a gait dynamics framework, with attention to task constraints that may have influenced the findings.
关于在地面行走和跑步机上行走时的步态特征，我们已经了解了很多。然而，在许多情况下，比如在家中进行物理治疗时，可能无法进行地面行走或在跑步机上行走。在这些情况下，一种用于指示步态行为的替代任务将是一种有价值的工具。因此，本研究的目的是评估与跑步机行走相比，静止踏步的步幅行为特征。健康的年轻成年人（N = 10）完成了两项15分钟的任务：（1）在跑步机上行走和（2）静止踏步。记录了几个步幅行为特征，包括步数、最小和最大膝关节角度、步幅间隔平均值、步幅间隔标准差以及步幅间隔时间序列的去趋势波动分析（DFA）α值。结果表明，在组水平上进行检查时，两项任务之间的步幅行为相似。然而，当使用个体水平分析来检查各项指标在两项任务之间的可靠性时，大多数指标的可靠性较差，这表明静止踏步可能不是地面行走或跑步机行走的合适替代任务。我们在步态动力学框架的背景下讨论了这些结果，并关注了可能影响研究结果的任务限制因素。
