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首页> 外文期刊>Journal of Biomechanics >Single-subject analysis reveals variation in knee mechanics during step landing
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Single-subject analysis reveals variation in knee mechanics during step landing

机译：单项分析揭示了踏步过程中膝盖力学的变化

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Purpose: Evidence concerning the alteration of knee function during landing suffers from a lack of consensus. This uncertainty can be attributed to methodological flaws, particularly in relation to the statistical analysis of variable human movement data. The aim of this study was to compare single-subject and group analyses in detecting changes in knee stiffness and coordination during step landing that occur independent of an experimental intervention. Methods: A group of healthy men (N=12) stepped-down from a knee-high platform for 60 consecutive trials, each trial separated by a 1-minute rest. The magnitude and within-participant variability of sagittal stiffness and coordination of the landing knee were evaluated with both group and single-subject analyses. Results: The group analysis detected significant changes in knee coordination. However, the single-subject analyses detected changes in all dependent variables, which included increases in variability with task repetition. Between-individual variation was also present in the timing, size and direction of alterations. Conclusion: The results have important implications for the interpretation of existing information regarding the adaptation of knee mechanics to interventions such as fatigue, footwear or landing height. It is proposed that a participant's natural variation in knee mechanics should be analysed prior to an intervention in future experiments.
机译：目的：关于着陆过程中膝盖功能改变的证据缺乏共识。这种不确定性可以归因于方法上的缺陷，特别是与可变人体运动数据的统计分析有关的缺陷。这项研究的目的是比较单主体分析和组分析在检测步降过程中膝盖刚度和协调性的变化，这些变化独立于实验干预而发生。方法：一组健康男人（N = 12）从膝盖高的平台上走下，进行了60次连续试验，每项试验间隔1分钟。矢状刚度的大小和参与者内变异性以及着陆膝关节的协调性均通过组和单项分析进行了评估。结果：小组分析发现膝关节协调性有明显变化。但是，单对象分析会检测到所有因变量的变化，其中包括随着任务重复而增加的可变性。在变更的时间，大小和方向上也存在个体之间的差异。结论：该结果对于解释有关膝盖力学适应疲劳，鞋类或着陆高度等干预措施的现有信息具有重要意义。建议在干预未来的实验之前，应分析参与者膝关节力学的自然变化。

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