Acute effects of exercise-induced neuromuscular fatigue on postural control

运动引起的神经肌肉疲劳对姿势控制的急性影响

• 批准号: RGPIN-2018-06526
• 负责人: Bilodeau, Martin
• 金额: $ 4.23万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=764501
• 关键词: Acute; effects; exercise; induced; neuromuscular

OBJECTIVESThe ability to control ones posture (or balance) is a prerequisite for the successful accomplishment of numerous types of activity. A bout of sustained exercise, sometimes leading to fatigue, can have a significant impact on postural control/balance. However, not all types of fatiguing activity lead to balance impairments, and the specific control features/mechanisms involved in balance that may be affected by fatigue remain largely unexplored. The main objectives of this proposed research program are to determine the effects of central and peripheral fatigue on key control features/mechanisms of standing posture, and whether these vary according to the nature/difficulty of the postural task performed and the population under study (future work).APPROACHThe general approach used to address these objectives will be to first characterize and select a set of fatiguing exercises/tasks which will involve various levels of central and peripheral fatigue (years 1-2 of the proposal). This set of fatiguing tasks will then be used to provide information on the specific (postural) control features/mechanisms affected by fatigue (years 3-5). This will be achieved by contrasting the behavior of variables reflecting control features of balance between the different fatiguing tasks, but also between postural tasks of different levels of difficulty, namely: i) quiet standing, ii) reactive responses to discrete postural perturbations, and iii) reactive and anticipatory responses to continuous postural perturbations. The main variables of interest to be assessed before, during and after selected bouts of sustained exercise leading to fatigue will include measurements from force plates (ground reaction forces), measurements of body segments positions and joint angles, and muscle activity.SIGNIFICANCEThe identification and understanding of factors affecting postural control/balance is important to various fields, including rehabilitation sciences (where the understanding of normal movement control is the basis for the design of interventions to address movement dysfunction), sports sciences, and others. Sustained exercise, sometimes leading to fatigue, is commonly experienced in everyday life and could interfere with optimal movement performance. However, the effect of exercise/fatigue on the control of stability/balance has not been studied systematically. This project will thus provide valuable novel information on factors important for the control of standing posture/balance.

控制姿势（或平衡）的能力是成功完成多种活动的先决条件。一轮持续的运动，有时会导致疲劳，可能会对姿势控制/平衡产生重大影响。然而，并非所有类型的疲劳活动都会导致平衡障碍，并且可能受疲劳影响的平衡中涉及的特定控制特征/机制在很大程度上仍未被探索。这项研究计划的主要目标是确定中枢和外周疲劳对站立姿势的关键控制特征/机制的影响，以及这些是否根据所执行的姿势任务的性质/难度和所研究的人群而变化（未来的工作）。方法用于解决这些目标的一般方法将是首先描述和选择一组疲劳练习/涉及不同程度中枢和外周疲劳的任务（建议的第1-2年）。然后，这组疲劳任务将用于提供受疲劳影响的特定（姿势）控制特征/机制的信息（3-5年）。这将通过对比反映不同疲劳任务之间以及不同难度水平的姿势任务之间的平衡的控制特征的变量的行为来实现，即：i）安静站立，ii）对离散姿势扰动的反应性响应，以及iii）对连续姿势扰动的反应性和预期性响应。在选定的导致疲劳的持续运动之前、期间和之后评估的主要关注变量将包括测力板的测量值（地面反作用力）、身体部分位置和关节角度的测量以及肌肉活动。意义识别和理解影响姿势控制/平衡的因素对各个领域都很重要，包括康复科学（对正常运动控制的理解是设计干预措施以解决运动功能障碍的基础）、运动科学等。持续的运动，有时会导致疲劳，在日常生活中很常见，可能会干扰最佳的运动表现。然而，运动/疲劳对稳定性/平衡控制的影响尚未得到系统的研究。因此，该项目将提供有关控制站立姿势/平衡的重要因素的有价值的新信息。