University of Applied Sciences, Leipzig, Germany.
University of Applied Sciences, Leipzig, Germany.
J Biomech. 2021 Apr 15;119:110316. doi: 10.1016/j.jbiomech.2021.110316. Epub 2021 Feb 12.
Understanding gait differences in context of group differences is dependent on statistical testing methods and time normalization techniques (TN). The method induces a relationship of both with one another. As to our knowledge, there has been no investigation into their relation so far. To show empirically what effects may be of importance, we use SPM with linear time interpolation (LI) and Dynamic Time Warping (DTW) separately for data of a study on stair ascent kinematics between two groups. There is a slight difference in statistical significance for the comparison of LI and DTW. LI-uniquely significant time highlight differences due to in-group time-variations, whereas DTW-uniqueness is tied to qualitative differences of homogeneous events. The comparison of stair ascent kinematics with DTW shows more pronounced evidence for backlift-like strategies for the older group, although trunk angles are kept more extended as to ensure stabilty. Thus, the difference in SPM from TN is slight but important, if there is need to mirror said effects methodically.
了解群体差异背景下的步态差异取决于统计测试方法和时间归一化技术（TN）。该方法会相互关联这两者。据我们所知，迄今为止，尚未对此进行任何调查。为了实证展示可能重要的影响，我们分别使用线性时间插值（LI）和动态时间规整（DTW）的 SPM 对两组楼梯上升运动学数据进行分析。LI 和 DTW 之间的比较在统计意义上略有差异。LI 唯一显著的时间突出了由于组内时间变化而导致的差异，而 DTW 的独特性则与同质事件的定性差异有关。尽管为了确保稳定性，躯干角度保持更伸展，但 DTW 对楼梯上升运动学的比较显示出老年人组更明显的后抬腿样策略的证据。因此，如果需要有针对性地反映这些影响，SPM 与 TN 的差异虽然细微但很重要。
