Misu Shogo, Asai Tsuyoshi, Ono Rei, Sawa Ryuichi, Tsutsumimoto Kota, Ando Hiroshi, Doi Takehiko
Department of Community Health Sciences, Kobe University Graduate School of Health Sciences, Kobe, Japan; Kobe City Hospital Organization, Kobe City Medical Center, West Hospital, Kobe, Japan.
Department of Physical Therapy, Faculty of Rehabilitation, Kobegakuin University, Kobe, Japan.
Gait Posture. 2017 Sep;57:295-298. doi: 10.1016/j.gaitpost.2017.06.022. Epub 2017 Jun 23.
The heel is likely a suitable location to which inertial sensors are attached for the detection of gait events. However, there are few studies to detect gait events and determine temporal gait parameters using sensors attached to the heels. We developed two methods to determine temporal gait parameters: detecting heel-contact using acceleration and detecting toe-off using angular velocity data (acceleration-angular velocity method; A-V method), and detecting both heel-contact and toe-off using angular velocity data (angular velocity-angular velocity method; V-V method). The aim of this study was to examine the concurrent validity of the A-V and V-V methods against the standard method, and to compare their accuracy. Temporal gait parameters were measured in 10 younger and 10 older adults. The intra-class correlation coefficients were excellent in both methods compared with the standard method (0.80 to 1.00). The root mean square errors of stance and swing time in the A-V method were smaller than the V-V method in older adults, although there were no significant discrepancies in the other comparisons. Our study suggests that inertial sensors attached to the heels, using the A-V method in particular, provide a valid measurement of temporal gait parameters.
足跟可能是一个适合附着惯性传感器以检测步态事件的位置。然而，很少有研究使用附着在足跟的传感器来检测步态事件并确定步态时间参数。我们开发了两种确定步态时间参数的方法：利用加速度检测足跟触地以及利用角速度数据检测足趾离地（加速度-角速度法；A-V法），以及利用角速度数据检测足跟触地和足趾离地（角速度-角速度法；V-V法）。本研究的目的是检验A-V法和V-V法相对于标准方法的同时效度，并比较它们的准确性。对10名年轻人和10名老年人的步态时间参数进行了测量。与标准方法相比，两种方法的组内相关系数都非常好（0.80至1.00）。在老年人中，A-V法中站立和摆动时间的均方根误差小于V-V法，不过在其他比较中没有显著差异。我们的研究表明，附着在足跟的惯性传感器，尤其是使用A-V法，能够有效地测量步态时间参数。
