Department of Biomechanics and Sports Injuries, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran.
Laboratory of Advanced Physiotherapy, Physiotherapy Department, School of Health and Care Sciences, University of West Attica, Athens, Greece.
J Musculoskelet Neuronal Interact. 2023 Jun 1;23(2):189-195.
The objective of this study was to examine the effects of fatigue on the coordination variability between the trunk, pelvis, and hips during treadmill running.
The kinematics data were recorded during ten successive treadmill steps running at the preferred speed and at 80% and 120% of the preferred speed. The angle segment data obtained during the running cycles were normalized to 100 data points, and they were split into ten periods. The coordination variability was calculated using the continuous relative phase (CRP) and variability (VCRP) methods for the trunk, pelvic and hip segments before and after the fatigue protocol.
The repeated measures analysis of variance showed significant differences in the trunk-pelvic and trunk-hip CRPs and in the CRP variability during the last 30% of the treadmill running cycles after fatigue (p≤0.05). In addition, significant differences were observed in the pelvic-hip CRP and the CRP variability in 40% of the initial treadmill running cycles after fatigue (p≤0.05).
According to the results of this study, fatigue reduces coordination and increases variability. The central nervous system probably exerts more control on the distal segments for maintaining moving patterns in fatigue conditions.
本研究旨在探讨疲劳对跑步机跑步过程中躯干、骨盆和臀部之间协调性变化的影响。
在以最佳速度和 80%及 120%最佳速度连续跑十步的过程中记录运动学数据。将跑步周期中获得的角度段数据归一化为 100 个数据点，并将其分为十个周期。在疲劳方案前后，使用连续相对相位 (CRP) 和变异系数 (VCRP) 方法计算躯干、骨盆和髋关节的协调性变化。
重复测量方差分析显示，疲劳后跑步机跑步最后 30%周期中，躯干-骨盆和躯干-髋关节的 CRP 以及 CRP 变异性存在显著差异（p≤0.05）。此外，疲劳后跑步机跑步初始 40%周期中，骨盆-髋关节的 CRP 和 CRP 变异性也存在显著差异（p≤0.05）。
根据这项研究的结果，疲劳会降低协调性并增加变异性。中枢神经系统可能会对远端节段施加更多的控制，以在疲劳状态下维持运动模式。
