Application of Jerk Analysis to a Repetitive Lifting Task in Patients with Chronic Lower Back Pain

摘要: Patients with chronic lower back pain (CLBP) typically demonstrate different biomechanics than healthy controls during a lifting task. Motion differences in repetitive task have been described previously using the timing of body angles changes lift. These rely on small motion and are difficult to measure interpret. The purpose this study is evaluate shoulder jerk (rate change acceleration) as parameter detect between CLBP patients impact rehabilitation program jerk. calculation proved be noisy since third derivative position, simulation was performed smoothing methods provide best estimates derivative. Woltring's generalized cross-validation spline produced fit subject data. Derivatives were calculated differentiation coefficients, root-means-square (rms) amplitude used for comparison. Lifts divided into phases early, middle or late based number repetitions completed by subject. Average values rms lift computed at each phases. Significant group found perform lifts progressed, increased both groups. A group-by-phase interaction significant. After completion program, greater In general, controls, suggesting that impacts style.