Workplace Factors & Gender in Dynamic Spinal Stability

工作场所因素

• 批准号: 7577439
• 负责人: MICHAEL L MADIGAN
• 金额: $ 18.29万
• 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/7577439
• 关键词: Accounting; Affect; Agriculture; Back; Biomechanics; Boxing; Calibration; Data; Disease; Environment; Epidemiologic Studies; Exertion; Female; Fibrinogen; Functional disorder; Future; Gender; Goals; Health; Individual; Industry; Injury; Isometric Exercise; Isotonic Exercise; Kinetics; Knowledge; Lifting; Manuals; Measurement; Measures; Modeling; Movement; Muscle; Musculoskeletal; Nonlinear Dynamics; Occupational Diseases; Occupations; Output; Pattern; Physiology; Positioning Attribute; Posture; Principal Investigator; Reflex action; Reporting; Research; Research Personnel; Risk; Risk Estimate; Role; Sex Characteristics; Simulate; Spinal; Testing; Time; Tissues; Training; Vertebral column; Weight; Woman; Workplace; design; disorder risk; ergonomics; experience; high risk; improved; insight; kinematics; male; men; motor control; musculoskeletal injury; neglect; neuromuscular; prevent; research study; response; 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）：该项目的目的是确定工作场所因素（抬高负载，姿势）和性别如何影响提升量的脊柱的负载耐受性。脊柱屈曲的耐受性描述了在不稳定性和随后的组织损伤阈值下的负载耐受性。屈曲耐受性受脊柱稳定性的神经肌肉控制控制。拟议的研究是R01 AR46111的延续，我们证明了：1）活性肌肉和反射的刚度都是维持脊柱稳定性的必要条件； 2）这些因素受树干扩展力，姿势和性别的影响。这些表明性别和工作场所因素会影响损伤的耐受性（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负荷，我们将完成三个特定目标。特定目标1将衡量如何通过自愿躯干扩展量的负载，姿势和性别来改变活性肌肉的反射力和刚度，以模拟手动材料处理 /提升任务。这些数据将用于校准脊柱屈曲载荷的主体特异性生物力学分析（固有肌肉刚度增益和反射增益的校准参数）。特定的目标2将在单独的动态提升运动中测量躯干动力学，运动学和EMG，以模拟低风险和高风险手动材料处理 /提升任务。这些数据将使用校准的，受试者特定的生物力学分析，以分析稳定性，以输出脊柱的屈曲耐性，这是载荷，姿势和性别的函数。具体目标3将比较经验测量的躯干稳定性与特定目标2中计算的数据。非线性动态分析（FLOQUET倍增器）将从在躯干扩展过程中所应用的小躯干扰动中记录的数据中记录的数据中记录的数据相似，类似于在特定目标中记录的条件。将检查负载，姿势和性别的影响。这项研究旨在洞悉与举重相关的肌肉骨骼损伤的潜在病理生理学，该病变专家可以将其用于研究改进的MMH任务设计，并在工作场所中纳入更安全的性别。