Physiology of Cumulative Low Back Disorders

描述：生物力学和生理过程与 由于长期应用， 将调查对脊柱的静态和重复性职业负荷。它 假设脊柱组织在暴露于蠕变/伸长时 重复的或静态的负荷，导致感觉受体的脱敏， 以及随之而来的反射性肌肉活动的丧失， 不稳定性和潜在的伤害。蠕变/伸长率完全恢复 在连续的工作周期之间休息时的肌肉活动可能不会 可能的，允许残余蠕变/伸长率的累积增加超过 时间发展长期持久的神经肌肉疾病。 一项为期五年的实验研究计划， 模型将系统地探讨累积负荷之间的关系 应用于脊柱韧带、椎间盘等，在连续静态和循环工作中 /休息期间以及随后的恢复在8小时的休息， 椎旁肌的活动水平及其功能障碍。 这项研究的结果将为生物力学提供强有力的见解， 常见职业活动中下背部疾病的神经生理学; 提供对连续累积负荷和每日休息的影响的深入了解 在短期和长期的发展脊柱疾病;并描绘 最佳的工作/休息时间，可以最大限度地减少或防止低血糖的发展 最常见的职业活动中的背部疾病。

DESCRIPTION: The biomechanical and physiological processes associated with the development of cumulative spinal disorders due to long term application of static and repetitive occupational loads to the spine will be investigated. It is hypothesized that spinal tissues, when exposed to creep / elongation due to repetitive or static loads, cause desensitization of sensory receptors within and consequent loss of reflexive muscular activity, rendering the spine exposed to instability and potential injury. Full recovery of the creep / elongation and muscle activity while resting between sequential work periods may not be possible, allowing the cumulative increase of residual creep / elongation over time to develop long lasting neuromuscular disorders. A five year experimental research program consisting of the in-vivo feline model will systematically explore the relationship between cumulative loads applied to spinal ligaments, discs, etc., in sequential static and cyclic work / rest periods as well as the following recovery in eight hours of rest to the activity level of paraspinal muscles and the disorders in their functions. The results of this research will provide strong insights into biomechanics and the neurophysiology of low back disorders in common occupational activities; provide an insight to the effect of sequential cumulative loads and daily rest on development of spinal disorder in the short and long term; and delineate optimal work / rest periods that may minimize or prevent the development of low back disorders in the most common occupational activities.