UNESP, São Paulo State University at Rio Claro, LEPLO, São Paulo, Brazil; Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Amsterdam, The Netherlands.
Gait Posture. 2013 Sep;38(4):702-7. doi: 10.1016/j.gaitpost.2013.03.006. Epub 2013 Apr 2.
The aim of this study was to analyze the effect of muscle fatigue in active and inactive young adults on the kinematic and kinetic parameters of normal gait and obstacle crossing. Twenty male subjects were divided into active (10) and inactive (10), based on self-reported physical activity. Participants performed three trials of two tasks (normal gait and obstacle crossing) before and after a fatigue protocol, consisting of repeated sit-to-stand transfers until the instructed pace could no longer be maintained. MANOVAs were used to compare dependent variables with the following factors: physical activity level, fatigue and task. The endurance time in the fatigue protocol was lower for the inactive group. Changes of gait parameters with fatigue, among which increased step width and increased stride speed were the most consistent, were independent of task and physical activity level. These findings indicate that the kinematic and kinetic parameters of gait are affected by muscle fatigue irrespective of the physical activity level of the subjects and type of gait. Inactive individuals used a slightly different strategy than active individuals when crossing an obstacle, independently of muscle fatigue.
本研究旨在分析肌肉疲劳对活跃和不活跃的年轻成年人正常步态和跨越障碍物的运动学和动力学参数的影响。20 名男性受试者根据自我报告的身体活动情况分为活跃组（10 名）和不活跃组（10 名）。参与者在疲劳方案前后进行了三次两项任务（正常步态和跨越障碍物）的试验，疲劳方案包括重复坐站转移，直到无法维持规定的速度。MANOVA 用于比较依赖变量与以下因素：身体活动水平、疲劳和任务。疲劳方案中不活跃组的耐力时间较低。步态参数随疲劳的变化，其中步幅增宽和步速增加最为一致，与任务和身体活动水平无关。这些发现表明，无论受试者的身体活动水平和步态类型如何，肌肉疲劳都会影响步态的运动学和动力学参数。不活跃的个体在跨越障碍物时使用了一种与活跃个体略有不同的策略，而这种策略与肌肉疲劳无关。
