Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.
Gait Posture. 2010 Mar;31(3):331-5. doi: 10.1016/j.gaitpost.2009.12.003. Epub 2010 Jan 6.
The current study examined variability and fluctuation in the running gait cycle, focusing on differences between trained distance runners and non-runners. The two groups of participants performed treadmill running at 80%, 100%, and 120% of their preferred speed for 10 min. Stride-interval time-series were recorded during running using footswitches. The average preferred speed was significantly higher for the trained runners than for the non-runners. The trained runners showed significantly smaller variability of stride interval than did the non-runners, and at the same time the scaling exponent alpha evaluated by detrended fluctuation analysis tended to be smaller for the trained runners. These results suggest that expert runners can reduce variability in the trained movement without loosing dynamical degrees of freedom for spatiotemporal organization of the gait pattern.
本研究考察了跑步步态周期的可变性和波动性，重点关注训练有素的长跑运动员和非跑步者之间的差异。两组参与者在跑步机上以 80%、100%和 120%的最佳速度分别进行了 10 分钟的跑步。使用脚踏开关记录跑步过程中的步长间隔时间序列。经过训练的跑步者的平均最佳速度明显高于非跑步者。与非跑步者相比，训练有素的跑步者的步长间隔变化性明显更小，同时，通过去趋势波动分析评估的标度指数 alpha 对于训练有素的跑步者也趋于更小。这些结果表明，专家跑步者可以在不失去步态模式时空组织的动力学自由度的情况下，减少训练动作的可变性。
