Barbieri F A, Gobbi L T B, Lee Y J, Pijnappels M, van Dieën J H
a Department of Physical Education, Laboratório de Estudos da Postura e da Locomoção , São Paulo State University , Rio Claro , Brazil.
Ergonomics. 2014;57(6):934-42. doi: 10.1080/00140139.2014.903302. Epub 2014 Apr 4.
The aim of this study was to evaluate the effects of muscle fatigue of triceps surae and quadriceps muscles in stepping down in ongoing gait. We expected that the subjects would compensate for muscle fatigue to prevent potential loss of balance in stepping down. A total of 10 young participants walked over a walkway at a self-selected velocity to step down a height difference of 10-cm halfway. Five trials were performed before and after a muscle fatigue protocol. Participants performed two fatigue protocols: one for ankle muscle fatigue and another for knee muscle fatigue. Kinematics of and ground reaction forces on the leading leg were recorded. Fatigue did not cause a change in the frequency of heel or toe landing. Our results indicate that in stepping down fatigue effects are compensated by redistributing work to unfatigued muscle groups and by gait changes aimed at enhancing balance control, which was however only partially successful.
本研究的目的是评估在持续步态中进行下台阶动作时，小腿三头肌和股四头肌肌肉疲劳的影响。我们预计受试者会补偿肌肉疲劳，以防止下台阶时潜在的平衡丧失。共有10名年轻参与者以自我选择的速度走过一条通道，中途从10厘米的高度差处下台阶。在肌肉疲劳方案前后各进行5次试验。参与者进行了两种疲劳方案：一种用于脚踝肌肉疲劳，另一种用于膝盖肌肉疲劳。记录了前腿的运动学和地面反作用力。疲劳并未导致脚跟或脚趾着地频率的改变。我们的结果表明，在下台阶时，疲劳影响通过将工作重新分配到未疲劳的肌肉群以及通过旨在增强平衡控制的步态变化得到补偿，然而这只是部分成功。
