College of Kinesiology, University of Saskatchewan, Saskatoon, SK, Canada.
Faculty of Kinesiology and Health Studies, University of Regina, Regina, SK, Canada.
Gait Posture. 2020 Jun;79:108-110. doi: 10.1016/j.gaitpost.2020.04.024. Epub 2020 May 1.
There is emerging evidence that gait variability outcomes provide unique insights regarding the status of an individual's locomotor control system; however, there is currently limited evidence on the within-day reliability of stride time variability (STV) outcomes, or whether they demonstrate diurnal variation, when measured during continuous, overground walking in healthy young adults.
Thirty-one healthy young adults (20.8 ± 3.7 years) completed two 10-minute continuous, overground walking trials on the same day (9:00-11:00am and 3:00-5:00pm) at their preferred walking speed. Data from a waist-mounted tri-axial accelerometer were used to determine the series of consecutive stride times for each trial.
There were no significant differences between sessions for average walking speed, average stride time, or STV. The within-day reliability was excellent for average walking speed and stride time, and generally poor to fair for STV.
Healthy young adults do not appear to demonstrate diurnal variation in STV outcomes during continuous, overground walking; however, the development of a protocol to improve their reliability, as well as the establishment of normative ranges for such outcomes, would be beneficial to improve their application and interpretation in research and clinical settings.
越来越多的证据表明，步态可变性指标能为个体运动控制系统的状态提供独特的见解；然而，目前关于健康年轻成年人在连续的地面行走过程中测量的步时可变性（STV）指标的日内重复性，或其是否存在昼夜变化的证据有限。
1）在健康年轻成年人连续的地面行走过程中，在上午和下午测量的 STV 结果是否存在显著差异？2）健康年轻成年人在连续的地面行走过程中测量的 STV 结果的日内重复性如何？
31 名健康的年轻成年人（20.8±3.7 岁）以他们的习惯速度在同一天（上午 9：00-11：00 和下午 3：00-5：00）完成两次 10 分钟的连续地面行走试验。使用腰部三轴向加速度计的数据来确定每个试验的连续步时序列。
两次试验之间在平均行走速度、平均步时或 STV 方面均无显著差异。平均行走速度和步时的日内重复性极好，而 STV 的重复性一般较差到尚可。
健康的年轻成年人在连续的地面行走过程中，STV 结果似乎没有昼夜变化；然而，制定一个提高其可靠性的方案，并建立这些结果的正常范围，将有助于改善其在研究和临床环境中的应用和解释。
