a The University of Tokyo , Department of Human and Engineered Environmental Studies , Kashiwa , Japan.
J Sports Sci. 2013;31(16):1841-53. doi: 10.1080/02640414.2013.805884. Epub 2013 Jul 24.
The purpose of the present study was to relate 3D acceleration patterns of the lower and upper trunk during running to running gait cycle, assess the validity of stride duration estimated from acceleration patterns, investigate speed-dependent changes in acceleration, and examine the test-retest reliability of these parameters. Thirteen healthy young men performed two running trials each on a treadmill and on land at three speeds (slow, preferred, and fast). The 3D accelerations were measured at the L3 spinous process (lower trunk) and the ensiform process (upper trunk) and synchronised with digital video data. The amplitude and root mean square of acceleration and stride duration were calculated and then analysed by three-way analysis of variance to test effects of running conditions, device location, and running speed. Bland-Altman analysis was used to evaluate the test-retest reliability. Marked changes in acceleration were observed in relation to foot strike during running. Stride durations calculated from the vertical accelerations were nearly equal to those estimated from video data. There were significant speed effects on all parameters, and the low test-retest reliability was confirmed in the anterior-posterior acceleration during treadmill running and the anterior-posterior acceleration at slow speed during treadmill and overground running.
本研究的目的是将跑步时下肢和上肢的三维加速度模式与跑步步态周期相关联，评估从加速度模式估计的步幅时间的有效性，研究加速度的速度依赖性变化，并检验这些参数的测试-重测可靠性。13 名健康的年轻男性在跑步机和地面上以三种速度（慢、中、快）各进行两次跑步试验。在 L3 棘突（下躯干）和胸骨柄（上躯干）处测量三维加速度，并与数字视频数据同步。计算加速度的幅度和均方根以及步幅时间，然后通过三因素方差分析来检验跑步条件、设备位置和跑步速度的影响。 Bland-Altman 分析用于评估测试-重测可靠性。在跑步过程中，与足触地相关的加速度发生明显变化。从垂直加速度计算得出的步幅时间几乎与从视频数据估计的步幅时间相等。所有参数都有显著的速度影响，在跑步机跑步时的前后加速度以及在跑步机和地面跑步时的慢速度的前后加速度的测试-重测可靠性都很低。
