Effects of upper body static deep flexion on spinal stability

上身静态深度屈曲对脊柱稳定性的影响

• 批准号: 7960824
• 负责人: Gwanseob Shin
• 金额: $ 7.3万
• 依托单位: STATE UNIVERSITY OF NEW YORK AT BUFFALO
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7960824
• 关键词: Effects; upper; body; static; deep

DESCRIPTION (provided by applicant): Maintaining a deep upper body forward flexion posture (stooped posture) for a prolonged period of time has been known to contribute to the occurrence or development of work-related low back musculoskeletal disorders, but its injury mechanisms and risk assessment have not been adequately studied. Existing literature proposes that prolonged stretching of spinal tissues in static deep flexion can cause impairment in spinal stability due to laxity in the spine and passively developed fatigue in low back extensor muscles, placing the low back vulnerable to musculoskeletal disorders. The primary objective of this proposal is to quantify the effects of static flexion on spinal stability, with specific consideration of spinal laxity and fatigue development in the low back extensor muscles as intermediate factors to the impairment in the spinal stability. A laboratory in vivo experiment will be conducted in two years to quantitatively evaluate the changes in spinal laxity, fatigue in the low back extensor muscles, and spinal stability by obtaining relevant biomechanical responses of the low back before, periodically during and after a period of repetitive static flexion. Three different patterns (work-rest schedule) of repetitive static flexion will be tested. Successful completion of this project will produce important information on the mechanism of injury and risk assessment, and will facilitate further research projects towards a long-term goal of developing injury prevention strategies to reduce the risk of work-related low back musculoskeletal disorders. The proposed work addresses several NORA sector programs and cross-sector programs including Exposure Assessment and Musculoskeletal Disorders programs. PUBLIC HEALTH RELEVANCE: Maintaining a stooped or a upper body deep flexion posture for a period of time is a problematic work activity for low back. This project is aimed at providing a better understanding of an injury mechanism of work-related low back musculoskeletal disorders associated with upper body static deep flexion, and exploring a method to quantitatively assess the static flexion-related risks by quantifying the effects of static flexion on spinal stability under various loading patterns.

描述（由申请人提供）：已知长期保持深层上半身的前进屈曲姿势（弯曲的姿势），这有助于造成与工作相关的下背部肌肉骨骼疾病的发生或发展，但其损伤机制和风险评估尚未得到充分研究。现有文献提出，静态深屈曲中的脊柱组织长时间伸展会导致脊柱静松展引起的脊柱稳定性损害，并在下背部伸肌肌肉中被动发育疲劳，使下背部容易受到肌肉骨骼障碍的影响。该提案的主要目的是量化静态屈曲对脊柱稳定性的影响，并特别考虑下腰部伸肌肌肉中脊柱松弛和疲劳的发育，这是脊柱稳定性损害的中间因素。将在两年内进行实验室体内实验，以定量评估脊柱松弛性的变化，下背部伸肌肌肉的疲劳以及脊柱稳定性，通过在重复性静态屈曲期间定期获得较低后背部的相关生物力学反应。将测试重复静态屈曲的三种不同模式（工作及其时间表）。该项目的成功完成将提供有关伤害和风险评估机制的重要信息，并将促进进一步的研究项目，以制定预防伤害策略的长期目标，以减少与工作相关的下背部肌肉骨骼疾病的风险。拟议的工作涉及多个NORA部门计划和跨部门计划，包括暴露评估和肌肉骨骼疾病计划。 公共卫生相关性：在一段时间内维持弯腰或上身深屈服的姿势是腰背的有问题的工作活动。该项目旨在更好地理解与上身静态深屈曲相关的与工作相关的下背部肌肉骨骼疾病的损伤机制，并通过量化各种负载模式下静态屈曲对脊柱稳定性的影响来定量评估静态屈曲相关风险的方法。