The use of splines to calculate jerk for a lifting task involving chronic lower back pain patients.
The use of splines to calculate jerk for a lifting task involving chronic lower back pain patients.
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使用样条曲线计算涉及慢性腰痛患者的举重任务的加加速度。
DOI：
10.1109/tnsre.2005.844252
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Rasetshwane,DanielM
中科院分区：
文献类型：
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作者：
Slaboda,JillC;Boston,JRobert;Rudy,ThomasE;Lieber,SusanJ;Rasetshwane,DanielM
重复举重任务中的运动差异先前已经描述过，在举重过程中使用身体角度变化的时间差异。这些时间变化依赖于微小的运动差异，很难测量。本研究的目的是评估肩跳（加速度变化率）在重复性举重任务中作为检测对照组和慢性下背部疼痛（CLBP）患者运动差异的替代参数，并测量康复计划对肩跳的影响。抖动计算是一个有噪声的度量，因为抖动是位置的三阶导数；因此，进行了仿真来评估平滑方法。Woltring的广义交叉验证样条产生了三阶导数的最佳估计，并且适合于受试者数据。采用抽动振幅均方根（rms）进行比较。组间差异显著。与对照组相比，CLBP患者进行举重时的牵拉值较低，随着任务的进行，两组的牵拉值都有所增加。在完成康复计划后，CLBP患者进行了更大的rms抽搐的举重。一般来说，患者进行举重时的拉力值比对照组低，这表明疼痛影响举重方式。
Motion differences in a repetitive lifting task have been described previously using differences in the timing of body angle changes during the lift. These timing changes relied on small differences of motion and are difficult to measure. The purpose of this study was to evaluate shoulder jerk (rate of change of acceleration) in a repetitive lifting task as an alternative parameter to detect differences of motion between controls and chronic lower back pain (CLBP) patients and to measure the impact of a rehabilitation program on jerk. The jerk calculation was a noisy measure, since jerk is the third derivative of position; consequently a simulation was performed to evaluate smoothing methods. Woltring's generalized cross-validation spline produced the best estimates of the third derivative and was fit to subject data. The root mean square (rms) amplitude of jerk was used for comparison. Significant group differences were found. CLBP patients performed lifts with lower jerk values than controls and, as the task progressed, both groups increased jerk. After completion of a rehabilitation program, CLBP patients performed lifts with greater rms jerk. In general, patients performed lifts with lower jerk values than controls, suggesting that pain impacts lifting style.