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物理治療
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Background and Purpose: Prolonged standing workers have a high proportion of low back pain (LBP). Their work demands also involve turning a body, pushing or pulling, lifting, and leaning forward. Repetitive faulty compensatory movements have been found associated with developing LBP. Many researchers attribute these movement faults to decreased movement control ability and proposed a series of movement control tests for assessment. The purposes of this study are (1) to compare the movement control ability between prolonged standing workers with and without LBP, and (2) to explore the relationships among LBP problems, physical work demands, and the movement control ability. Methods: A total of 72 prolonged standing workers (36 with and 36 without LBP) participated in the first part of the study. In the second part, data from 101 workers (65 with and 36 without LBP) were analyzed. After inquiring about the subjects' basic data, physical work demands, and LBP-related information, a physical therapist performed a set of 16 lumbar movement control tests. Results: Our study showed significant differences existed between workers with and without LBP in the lumbar extension (p ＜ 0.001), flexion (p ＜ 0.001), and rotation (p ＜ 0.001) control tests. There are significant differences among different static standing postures in the scores of the lumbar extension control test (p = 0.006), but no significant difference in the scores of the lumbar flexion (p = 0.621) and rotation (p = 0.052) control tests. Heavy work demand was found associated with the score of the lumbar extension control tests (r = -0.216, p = 0.030), the score of the lumbar flexion control tests (r = -0.305, p = 0.002), and the score of the lumbar rotation control tests (r = -0.288, p = 0.003). Conclusion: Prolonged standing workers with LBP demonstrated poorer lumbar movement control ability in all movement directions. Among them, the static standing posture of lumbar lordosis is related to poorer lumbar extension control ability, and the work demands with loading are related to the lumbar extension, flexion, and rotation control ability. Clinical Relevance: LBP is a multidimensional phenomenon, our study yields a preliminary understanding of the relationships between LBP, physical work demands, and lumbar movement control ability of the prolonged standing workers.