Workplace Factors & Gender in Dynamic Spinal Stability

工作场所因素

• 批准号: 7354120
• 负责人: MICHAEL L MADIGAN
• 金额: $ 18.19万
• 依托单位: VIRGINIA POLYTECHNIC INST AND ST UNIV
• 依托单位国家: 美国
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-30 至 2011-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7354120
• 关键词: Accounting; Affect; Agriculture; Back; Biomechanics; Boxing; Calibration; Condition; Data; Disease; Electromyography; Environment; Exertion; Facility Construction Funding Category; Female; Fibrinogen; Functional disorder; Future; Gender; Goals; Health; Individual; Industry; Injury; Investigation; Isometric Exercise; Isotonic Exercise; Kinetics; Knowledge; Lifting; Manuals; Measurement; Measures; Modeling; Movement; Muscle; Musculoskeletal; Nonlinear Dynamics; Occupational Diseases; Occupations; Output; Pattern; Personal Satisfaction; Physiology; Positioning Attribute; Posture; Principal Investigator; Purpose; Rate; Reflex action; Reporting; Research; Research Personnel; Risk; Risk Estimate; Role; Sex Characteristics; Simulate; Spinal; Testing; Time; Tissues; Today; Training; Vertebral column; Weight; Woman; Workplace; design; disorder risk; ergonomics; experience; improved; insight; kinematics; male; men; motor control; musculoskeletal injury; neglect; prevent; research study; response; size; working men

DESCRIPTION (provided by applicant): The goal of this project is to identify how workplace factors (lifted load, posture) and gender influence the loading tolerance of the spine during lifting exertions. Spinal buckling tolerance describes the loading tolerance at the threshold of instability and subsequent tissue injury. Buckling tolerance is controlled by neuromuscular control of spinal stability. The proposed research is a continuation of R01 AR46111 where we demonstrated: 1) stiffness of active muscles and reflexes are both necessary to maintain spinal stability; and 2) these factors are influenced by trunk extension force, posture, and gender. These indicate that gender and workplace factors influence injury tolerance (stability and associated buckling tolerance). To understand how workplace factors influence spinal stability and buckling load we will complete three specific aims. SPECIFIC AIM 1 will measure how reflex force and stiffness of active muscles are modified by load, posture and gender during voluntary trunk extension exertions to simulate manual materials handling / lifting tasks. These data will be used to calibrate a subject-specific biomechanical analysis of spinal buckling load (calibrated parameters of intrinsic muscle stiffness gain and reflex gain). SPECIFIC AIM 2 will measure the torso kinetics, kinematics and EMG in separate dynamic lifting exertions to simulate low- risk and high-risk manual materials handling / lifting tasks. These data will be analyzed using the calibrated, subject-specific biomechanical analysis of stability to output buckling tolerance of the spine as a function of lifted load, posture and gender. SPECIFIC AIM 3 will compare empirically measured torso stability with the data computed in specific Aim 2. Nonlinear dynamic analyses (Floquet multipliers) will be determined from data recorded during small torso disturbances applied during trunk extension exertions similar to conditions recorded in Specific Aim 2. The roles of intrinsic muscle stiffness and reflex contributes to spinal stability will be investigated separately. Effects of load, posture and gender will be examined. This research is designed to provide insight into the underlying pathophysiology of lifting-related musculoskeletal injury that can be used by ergonomic experts to investigate improved MMH task design and safer gender inclusion in the workplace.

描述（由申请人提供）：该项目的目标是确定工作场所因素（举重、姿势）和性别如何影响举重过程中脊柱的负荷耐受性。脊柱屈曲耐受性描述了不稳定阈值和随后的组织损伤时的负载耐受性。屈曲耐受性是通过脊柱稳定性的神经肌肉控制来控制的。拟议的研究是 R01 AR46111 的延续，我们证明：1）活动肌肉的僵硬和反射对于维持脊柱稳定性都是必要的； 2）这些因素受到躯干伸展力、姿势和性别的影响。这些表明性别和工作场所因素影响伤害耐受性（稳定性和相关的屈曲耐受性）。为了了解工作场所因素如何影响脊柱稳定性和屈曲载荷，我们将完成三个具体目标。具体目标 1 将测量在自愿躯干伸展运动期间，主动肌肉的反射力和刚度如何因负载、姿势和性别而改变，以模拟手动材料搬运/举升任务。这些数据将用于校准脊柱屈曲载荷的特定于受试者的生物力学分析（内在肌肉刚度增益和反射增益的校准参数）。 SPECIFIC AIM 2 将测量单独的动态提升动作中的躯干动力学、运动学和肌电图，以模拟低风险和高风险的手动材料搬运/提升任务。这些数据将使用经过校准的、针对特定主题的生物力学分析来分析，该分析对脊柱的输出屈曲容差稳定性进行分析，作为提升负载、姿势和性别的函数。具体目标 3 将根据经验测量的躯干稳定性与具体目标 2 中计算的数据进行比较。非线性动态分析（Floquet 乘数）将根据在躯干伸展运动期间施加的小躯干扰动期间记录的数据来确定，类似于具体目标 2 中记录的条件。内在肌肉刚度和反射对脊柱稳定性的作用将单独研究。将检查负荷、姿势和性别的影响。这项研究旨在深入了解与举重相关的肌肉骨骼损伤的潜在病理生理学，人体工程学专家可以利用该研究来研究改进的 MMH 任务设计和工作场所中更安全的性别包容。