JOINT ENERGY BALANCES: THE COMMITMENT TO THE SYNCHRONIZATION OF MEASURING SYSTEMS
JOINT ENERGY BALANCES: THE COMMITMENT TO THE SYNCHRONIZATION OF MEASURING SYSTEMS
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联合能量平衡：对测量系统同步的承诺
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
R. Blickhan
中科院分区：
文献类型：
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作者：
M. Günther;H. Witte;R. Blickhan
我们的研究量化的误差量引起的计算能量平衡的关节，如果地面反作用力的测量和视频数据之间的触发偏移发生。关节能量平衡构成了充分解释肌肉活动的基础。到目前为止，还没有公布的估计量的这种错误引入的同步不足，但目前似乎是必不可少的，在面对商业供应商提供完整的解决方案，从数据采集到逆动力学分析。作为一个例子，我们应用了一个逆动力学过程的数据集的接触阶段的人类运行的同步被人为干扰。我们比较了不同方法的逆动力学的误差量。我们发现，5 ms的时间偏移导致每个关节的能量平衡（髋关节高达28 J）几乎100%的误差（与零偏移相比）。在时间尺度上比相应动力学更晚出现的运动学事件将计算出的主要能量产生源从脚踝转移到臀部，反之亦然，如果出现沉淀物。这个5ms的同步误差甚至高于当正确同步但使用静态转矩平衡而不是复杂的逆动力学来计算关节转矩时引入的方法误差。我们的结论是，当购买专业的分析系统，强烈的冲动，以证明准确的同步应放在供应商。
Our study quantifies the amount of error induced in the calculated energy balances of the joints if a trigger offset between the measurement of ground reaction force and of video data occurs. Joint energy balances constitute the basis for an adequate interpretation of muscular activity. An estimation of the amount of this error introduced by deficient synchronization has not been published so far but currently seems to be essential in the face of commercial providers offering complete solutions from data acquisition up to inverse dynamics analyses. As an example, we applied an inverse dynamics process to a data set of the contact phase of human running where the synchronization was disturbed artificially. We compared the amount of error for different methods of inverse dynamics. We found that a time offset of 5 ms results in almost 100% error (compared to zero offset) in the energy balance of each joint (up to 28 J in the hip). A kinematic event appearing later on the time scale than the respective kinetics shifts the calculated main source of energy production from the ankle to the hip, and vice versa if appearing precipitate. This 5 ms synchronization error is even higher than the methodical error introduced when synchronizing correctly but using the static torque equilibrium instead of complex inverse dynamics for the calculation of joint torques. We conclude that when buying professional analysis systems a strong urge to prove exact synchronization should be put on the provider.
一种将生物力学数据与电影胶片同步的装置。
影响因子：
2.4
作者：
Rome,LC
通讯作者：
Rome,LC