Diverging times in movement analysis.

Diverging times in movement analysis.
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运动分析中的发散时间

DOI:
10.1016/j.jbiomech.2008.12.020
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发表时间:
2009
影响因子:
2.4
通讯作者:
Seyfarth A
Seyfarth A
中科院分区:
工程技术3区
文献类型:
--
作者:
Lipfert SW;Günther M;Seyfarth A

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在运动分析中,经常使用多个测量系统来记录生物力学变量。通常,希望将发生的事件分配到公共时间线,这可以通过同步数据采集来实现,即使用脉冲来触发所有系统上的样本。但是,并非所有系统都支持这种方法。可替换地,不同系统的测量可以由公共触发信号开始,而在采集期间它们的采样时钟没有进一步的同步。由此,可能引入两个系统误差,即时间滞后和时间漂移。这些错误的程度不仅取决于单个系统的属性,而且还取决于组合的系统集。在这项研究中,我们介绍了一个简单的方法来确定两个系统,包括相机和力板的时滞和时间漂移。我们的研究结果表明,这两个参数是存在的,并依赖于所选择的采样频率。我们的结论是,为了避免误解的记录信号的确定的时间滞后和时间漂移需要考虑到所有持续时间的审判。
In movement analysis, more than one measuring system is often used to record biomechanical variables. Usually, it is desired to assign the occurring events to a common time line, which can be accomplished by synchronizing data acquisition, i.e. using a pulse to trigger a sample on all systems. However, this method is not supported by every system. Alternatively, the measurements of different systems can be started by a common trigger signal with no further synchronization of their sampling clocks during acquisition. With that, two systematic errors may be introduced, namely time lag and time drift. The extents of these errors not only depend on the individual system properties, but also depend on the set of systems combined. In this study, we introduce a simple method to determine time lag and time drift for two systems including cameras and force plates. Our results show that both parameters are present and dependent on chosen sampling frequencies. We conclude that in order to avoid misinterpretation of recorded signals the identified time lag and time drift need to be taken into account for trials of all durations.
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