Faculty of Sport, University of Ljubljana, 1000 Ljubljana, Slovenia.
Department of Health Sciences, Mid Sweden University, 83125 Östersund, Sweden.
Sensors (Basel). 2023 Aug 14;23(16):7155. doi: 10.3390/s23167155.
A three-dimensional motion capture system (MoCap) and the Garmin Running Dynamics Pod can be utilised to monitor a variety of dynamic parameters during running. The present investigation was designed to examine the validity of these two systems for determining ground contact times while running in place by comparing the values obtained with those provided by the bilateral force plate (gold standard). Eleven subjects completed three 20-s runs in place at self-selected rates, starting slowly, continuing at an intermediate pace, and finishing rapidly. The ground contact times obtained with both systems differed significantly from the gold standard at all three rates, as well as for all the rates combined ( < 0.001 in all cases), with the smallest mean bias at the fastest step rate for both (11.5 ± 14.4 ms for MoCap and -81.5 ± 18.4 ms for Garmin). This algorithm was developed for the determination of ground contact times during normal running and was adapted here for the assessment of running in place by the MoCap, which could be one explanation for its lack of validity. In conclusion, the wearables developed for monitoring normal running cannot be assumed to be suitable for determining ground contact times while running in place.
一种三维运动捕捉系统（MoCap）和佳明跑步动态传感器（Garmin Running Dynamics Pod）可用于监测跑步过程中的各种动态参数。本研究旨在通过比较两种系统与双侧测力板（金标准）提供的数据，来评估这些系统在原地跑步时确定触地时间的有效性。11 名受试者以自定的速度完成了三次 20 秒的原地跑步，从慢开始，然后以中等速度继续，最后快速完成。两种系统获得的触地时间与金标准在所有三种速度下均有显著差异，所有速度组合也是如此（所有情况下均<0.001），在最快的步速下，两种系统的平均偏差最小（MoCap 为 11.5 ± 14.4 毫秒，Garmin 为-81.5 ± 18.4 毫秒）。该算法是为确定正常跑步时的触地时间而开发的，并在此将其改编用于评估原地跑步，这可能是其有效性不足的原因之一。总之，用于监测正常跑步的可穿戴设备不能假定适用于确定原地跑步时的触地时间。
