Lee Hyun-Seob, Lee Jae-Hyun, Kim Kyung-Ryur
Department of Physical Education, Graduate School of Education, Korea University, Seoul, Korea.
Department of Sports Science, Chungnam National University, Daejeon, Korea.
J Exerc Rehabil. 2024 Feb 21;20(1):42-48. doi: 10.12965/jer.2346580.290. eCollection 2024 Feb.
This study aims to demonstrate that when performing dynamic time warping (DTW) on gait data, multiple optimal warping paths (OWPs) with a minimum sum of local costs can occur and to propose an additional OWP selection method to address this problem. A 3-dimensional motion analysis experiment was conducted on 55 adult participants, including both males and females, to acquire gait data. This study analyzed 990 instances of DTW on gait data to examine the occurrence of multiple OWPs with the minimum sum of local costs. We subsequently applied an additional selection method to the multiple OWPs to determine the feasibility of identifying a single OWP. Multiple OWPs through DTW were observed 82 times, accounting for 8.28%. Notably, on the ankle joint of males, the rate was the highest at 11.11%. Cases with two multiple OWPs were the most prevalent at 56.10%, and cases with ten or more multiple OWPs accounted for 19.51%. The additional selection method proposed in this study was applied to the 82 instances in which multiple OWPs occurred. The results demonstrated the ability to identify a unique OWP in all cases. These results hold significance in identifying the shortcomings of conventional OWP selection methods previously employed and proposing solutions. It enhances the reliability, validity, and accuracy of studies utilizing DTW.
本研究旨在证明，在对步态数据进行动态时间规整（DTW）时，可能会出现具有最小局部成本总和的多个最优规整路径（OWP），并提出一种额外的OWP选择方法来解决这一问题。对55名成年参与者（包括男性和女性）进行了三维运动分析实验以获取步态数据。本研究对步态数据的990个DTW实例进行了分析，以检验具有最小局部成本总和的多个OWP的出现情况。随后，我们对多个OWP应用了一种额外的选择方法，以确定识别单个OWP的可行性。通过DTW观察到多个OWP的情况有82次，占8.28%。值得注意的是，在男性的踝关节处，这一比例最高，为11.11%。具有两个多个OWP的情况最为普遍，占56.10%，具有十个或更多多个OWP的情况占19.51%。本研究提出的额外选择方法应用于出现多个OWP的82个实例。结果表明在所有情况下都能够识别出唯一的OWP。这些结果对于识别先前使用的传统OWP选择方法的缺点并提出解决方案具有重要意义。它提高了利用DTW的研究的可靠性、有效性和准确性。
