Abstract Prolonged or repetitive spine flexion induces creep deformation of posterior spine tissues allowing for increased intervertebral motion beyond ‘normal’ limits, which may influence sub-regional (intersegmental) spine motion during subsequent manual lifting tasks. Using spine skin-surface kinematics, intersegmental lumbar spine motion was recorded over 20 minutes of prolonged static spine flexion and a subsequent manual lifting task (2 lifts every 3 minutes, 30 minutes total) in 14 participants. Results demonstrated that mid to lower lumbar intersegmental levels (i.e. L2/L3 to L4/L5) experienced the greatest overall creep deformation and range of motion during both prolonged flexion and manual lifting; however, overall range of motion during manual lifting was unaffected. Additionally, creep deformation did not completely recover within 30 minutes. Future work should continue to investigate the influence of this residual creep, as well as how overall creep deformation impacts spine neuromuscular control and stability, and ultimately the development of low back disorders. Practitioner summary: Mid to lower lumbar spine levels (i.e. L2/L3 to L4/L5) experienced the greatest creep deformation and range of motion during both prolonged flexion and manual lifting. Repeated lifting following prolonged flexion may limit creep recovery; however, overall lifting kinematic motion remained unchanged.

中文翻译：

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手动提升过程中蠕变变形对腰椎分区域运动的影响

摘要 长时间或重复的脊柱屈曲会引起后部脊柱组织的蠕变变形，从而增加超出“正常”限制的椎间运动，这可能会影响后续手动提升任务中的亚区域（节间）脊柱运动。使用脊柱皮肤表面运动学，在 20 分钟的长时间静态脊柱屈曲和随后的手动提升任务（每 3 分钟提升 2 次，总共 30 分钟）中记录了 14 名参与者的节段间腰椎运动。结果表明，在长时间屈曲和手动抬举过程中，中下腰节间水平（即 L2/L3 至 L4/L5）经历了最大的整体蠕变变形和运动范围；然而，手动提升过程中的整体运动范围不受影响。此外，蠕变变形在 30 分钟内没有完全恢复。未来的工作应该继续研究这种残余蠕变的影响，以及整体蠕变变形如何影响脊柱神经肌肉控制和稳定性，并最终影响下背部疾病的发展。从业者总结：中下腰椎水平（即 L2/L3 至 L4/L5）在长时间屈曲和手动抬起期间经历了最大的蠕变变形和运动范围。长时间屈曲后重复举重可能会限制蠕动恢复；然而，整体提升运动保持不变。从业者总结：中下腰椎水平（即 L2/L3 至 L4/L5）在长时间屈曲和手动抬起期间经历了最大的蠕变变形和运动范围。长时间屈曲后重复举重可能会限制蠕动恢复；然而，整体提升运动保持不变。从业者总结：中下腰椎水平（即 L2/L3 至 L4/L5）在长时间屈曲和手动抬起期间经历了最大的蠕变变形和运动范围。长时间屈曲后重复举重可能会限制蠕动恢复；然而，整体提升运动保持不变。