Assessing trunk motor variability in a changing spinal environment: an experimental study.

评估不断变化的脊柱环境中躯干运动的变异性：一项实验研究。

• 批准号: RGPIN-2014-05321
• 负责人: Descarreaux, Martin
• 金额: $ 1.89万
• 依托单位: Université du Québec à Trois-Rivières
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=567092
• 关键词: Assessing; trunk; motor; variability; changing

Motor variability is an important feature of human movement which can be measured using multiple parameters such as performance measures, kinematic and kinetic components of the movement pattern, muscle activity and muscle recruitment patterns. The main objective of this proposal is to identify and characterize trunk neuromuscular and kinematic adaptations to a “changing spinal environment”. The proposed research program will include a series of experiments designed to each address a specific hypothesis related to trunk and spinal motor variability under varying mechanical and neurophysiological conditions. The results of these studies will provide critical information regarding the development of acute and long term motor adaptation in the complex musculoskeletal spinal system. The results and knowledge derived from these studies could, in the long run, provide new insights on how intrinsic spinal variability can be exploited as a source of biomechanical variation without compromising work-related or other type of performances. Potential long term applications of this specific work include risk assessment in ergonomics, objective “return to work algorithm” as well as the development of standardized functional spinal evaluation and clinical diagnostic tools. METHODS All the proposed experiments will be based on a similar experimental protocol aimed at quantifying neuromechanical adaptations to various experimental conditions using trunk muscular activity recordings with large surface electrode matrices as well as lumbar spine and pelvis movements. A flexion-extension task and trunk muscle endurance will be studied as they both offer the possibility to investigate a standardized neuromuscular response with highly reproducible muscle activity and movement characteristics. Independent groups of healthy adult participants will be recruited to participate in each of these experiments (N= 40 per experiment) and will be asked to perform a series of standardized trunk flexion and extension under varying experimental conditions. With regard to motor variability, the various experiments suggested will try to answer the following research questions: [1] How does erector spinae muscle fatigue change trunk muscle recruitment strategies and kinematics? [2] How does abdominal muscle fatigue change trunk muscle recruitment strategies and kinematics? [3] How do changes in passive spinal stability affect trunk muscle recruitment strategies and kinematics? [4] How do nociceptive segmental inputs affect trunk muscle recruitment strategies and kinematics? Neuromuscular motor variability will be quantified using the spatial representation of muscular activity in EMG matrices during the various experimental tasks. Spatial reorganization of muscular activity in erector spinae and abdominal muscles will be assessed using multiple features of motor variability. Motor variability related to trunk movement will also be assessed by studying the movement interaction between the lumbar spine and the pelvis. My goal, with the present proposal, is to create an educational environment for graduate students that will foster interdisciplinary collaboration in order to ensure both diversified and high quality training of young researchers in the fields of motor control, biomechanics and signal processing. Current collaborations with the electrical engineering department have already led to the development of innovative approaches to the study muscle recruitment and movement organization.

运动变异性是人类运动的重要特征，可以使用多个参数进行测量，例如运动模式，肌肉活动和肌肉募集模式的性能测量，运动学和动力学成分。该提案的主要目的是识别和表征对“不断变化的脊柱环境”的树干神经肌肉和运动学适应。拟议的研究计划将包括一系列实验，旨在解决各种机械和神经生理条件下与躯干和脊柱运动变异性有关的特定假设。这些研究的结果将提供有关复杂肌肉骨骼脊柱系统中急性和长期运动适应性发展的关键信息。从长远来看，从这些研究中得出的结果和知识可以提供有关如何将固有性脊柱变异性作为生物力学变异来源的新见解，而不会损害与工作有关的或其他类型的表现。这项特定工作的潜在长期应用包括人体工程学中的风险评估，客观的“返回工作算法”以及标准化功能性脊柱评估和临床诊断工具的开发。方法所有提出的实验将基于类似的实验方案，该方案旨在使用带有较大表面电极材料的躯干肌肉活动记录以及腰椎和骨盆运动来量化各种实验条件的神经力学适应。屈曲 - 伸展任务和躯干肌肉耐力将进行研讨会，因为它们都可以使用高度可再现的肌肉活动和运动特征研究标准化的神经肌肉反应。将招募独立的健康成年参与者组以参与这些实验中的每一个（每个实验n = 40），并将被要求在不同的实验条件下执行一系列标准化的躯干屈曲和扩展。关于运动变异性，各种实验建议将尝试回答以下研究问题：[1]员工肌肉疲劳如何改变行李箱肌肉招募策略和运动学？ [2]腹部肌肉疲劳如何改变躯干肌肉招募策略和运动学？ [3]被动脊柱稳定性的变化如何影响树干肌肉招募策略和运动学？ [4]伤害性节段性输入如何影响躯干肌肉招募策略和运动学？在各种实验任务中，将使用肌肉活性的空间表示神经肌肉运动的变异性。将使用运动变异性的多种特征评估竖脊杆和腹部肌肉中肌肉活性的空间重组。与躯干运动有关的运动变异性也将通过研究腰椎和骨盆之间的运动相互作用来评估。我的目标是针对目前的建议，是为研究生创造一个教育环境，以促进跨学科的合作，以确保在运动控制，生物力学和信号处理领域对年轻研究人员进行多元化和高质量的培训。当前与电力工程部门的合作已经导致开发了研究肌肉招募和运动组织的创新方法。