Bryanton Megan A, Bilodeau Martin
School of Human Kinetics, University of Ottawa, ON, Canada; Aging and Movement Laboratory, Bruyère Research Institute, ON, Canada.
School of Rehabilitation Sciences, University of Ottawa, ON, Canada; Aging and Movement Laboratory, Bruyère Research Institute, ON, Canada.
Hum Mov Sci. 2016 Oct;49:47-53. doi: 10.1016/j.humov.2016.06.006. Epub 2016 Jun 17.
Previous research has indicated that muscle fatigue due to repeated bouts of physical activity can have negative residual effects on balance; however investigations using multi-joint forms of exercise involved in everyday settings and determination of how control of posture is altered during the physical activity itself are limited. The purpose of this investigation was to evaluate alterations in postural stability before, during, and after prolonged multi-joint STS exercise in healthy young adults. Center of pressure (COP) acquisitions were collected during repetitive STS exercise, while voluntary limits of stability (LOS) testing was performed before, immediately after, and 10min after STS exercise. By 50% total STS exercise time, fatigue resulted in increased anterio-posterior (y) and medio-lateral (x) COP path lengths (p=0.003 and p=0.018 respectively) and an anterior shift of COP at seat-off towards the mid-foot (p=0.010). No significant change in LOS mean amplitude was found after STS exercise; however a significant fatigue effect resulted in increased COPy sway velocity at maximal lean positions (p=0.006), but returned to PRE values after 10min of rest. Declines in postural stability during repetitive STS exercise was associated with reduced control of COP, as well as a reduced ability to stably control COP at extreme postural limits; however, 10min was adequate in young adults for recovery. These results may have important implications for monitoring fall risk due to acute bouts of exercise induced muscle fatigue from repetitive multi-joint activities such as the STS.
先前的研究表明，由于反复进行体育活动导致的肌肉疲劳会对平衡产生负面残留影响；然而，在日常环境中使用多关节运动形式进行的调查以及确定在体育活动本身过程中姿势控制如何改变的研究有限。本研究的目的是评估健康年轻成年人在长时间多关节坐站运动之前、期间和之后姿势稳定性的变化。在重复性坐站运动期间收集压力中心（COP）数据，同时在坐站运动之前、之后立即以及之后10分钟进行自愿性稳定极限（LOS）测试。到坐站运动总时间的50%时，疲劳导致前后（y）和内外侧（x）COP路径长度增加（分别为p = 0.003和p = 0.018），并且在离座时COP向前脚中部偏移（p = 0.010）。坐站运动后LOS平均幅度未发现显著变化；然而，显著的疲劳效应导致在最大倾斜位置时COPy摆动速度增加（p = 0.006），但在休息10分钟后恢复到运动前值。重复性坐站运动期间姿势稳定性的下降与COP控制能力降低以及在极端姿势极限下稳定控制COP的能力降低有关；然而，10分钟对年轻人来说足以恢复。这些结果可能对监测由于重复性多关节活动（如坐站运动）引起的急性运动性肌肉疲劳导致的跌倒风险具有重要意义。
