Mitschke Christian, Zaumseil Falk, Milani Thomas L
a Faculty of Behavioural and Social Sciences, Department of Human Locomotion , Institute of Human Movement Science and Health, Chemnitz University of Technology , Chemnitz , Germany.
Comput Methods Biomech Biomed Engin. 2017 Nov;20(14):1502-1511. doi: 10.1080/10255842.2017.1382482. Epub 2017 Sep 26.
Increasingly, inertial sensors are being used for running analyses. The aim of this study was to systematically investigate the influence of inertial sensor sampling frequencies (SF) on the accuracy of kinematic, spatio-temporal, and kinetic parameters. We hypothesized that running analyses at lower SF result in less signal information and therefore the inability to sufficiently interpret measurement data. Twenty-one subjects participated in this study. Rearfoot strikers ran on an indoor running track at a velocity of 3.5 ± 0.1 ms. A uniaxial accelerometer was attached at the tibia and an inertial measurement unit was mounted at the heel of the right shoe. All sensors were synchronized at the start and data was measured with 1000 Hz (reference SF). Datasets were reduced to 500, 333, 250, 200, and 100 Hz in post-processing. The results of this study showed that a minimum SF of 500 Hz should be used to accurately measure kinetic parameters (e.g. peak heel acceleration). In contrast, stride length showed accurate results even at 333 Hz. 200 Hz were required to calculate parameters accurately for peak tibial acceleration, stride duration, and all kinematic measurements. The information from this study is necessary to correctly interpret measurement data of existing investigations and to plan future studies.
惯性传感器越来越多地被用于跑步分析。本研究的目的是系统地研究惯性传感器采样频率（SF）对运动学、时空和动力学参数准确性的影响。我们假设，在较低的采样频率下进行跑步分析会导致信号信息减少，从而无法充分解读测量数据。21名受试者参与了本研究。后足着地的受试者在室内跑道上以3.5±0.1米/秒的速度跑步。在胫骨处附着一个单轴加速度计，并在右鞋的后跟处安装一个惯性测量单元。所有传感器在开始时进行同步，并以1000赫兹（参考采样频率）测量数据。在后期处理中，数据集被降至500、333、250、200和100赫兹。本研究结果表明，应使用至少500赫兹的采样频率来准确测量动力学参数（如足跟峰值加速度）。相比之下，步幅即使在333赫兹时也能得出准确结果。对于胫骨峰值加速度、步幅持续时间和所有运动学测量，需要200赫兹才能准确计算参数。本研究所得信息对于正确解读现有研究的测量数据以及规划未来研究是必要的。
