Variability of ground reaction forces during treadmill walking
Variability of ground reaction forces during treadmill walking
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DOI：
10.1152/japplphysiol.00969.2000
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发表时间：
2002-05-01
影响因子：
3.3
通讯作者：
Fukunaga, T
中科院分区：
文献类型：
--
作者：
Masani, K;Kouzaki, M;Fukunaga, T
本研究的目的是通过观察不同恒定速度下行走过程中地面反作用力（GRF）模式的变化，探讨神经肌肉运动系统是否在特定速度下得到优化。10名健康男性受试者被要求以3.0、4.0、5.0、6.0、7.0和8.0 km/h的速度在跑步机上行走。独立测量GRF的三个分量[垂直（F-x），前后（F-y）和中外侧（F-x）力]，每条腿连续走35步。为了量化GRIP模式，定义了5个指标（F-z的一、二峰、F-y的一、二峰和F-x峰）。计算这5个指标的变异系数，评价不同步行速度下的GRF变异性。在F-z和F-x峰的第一和第二峰，指数变异性随步行速度的增加而增加，而F-y的第一和第二峰在速度（5.5-5.8 km/h）时变异性最小，这与身体向前推进有关。这些结果表明，神经肌肉运动系统存在“最佳速度”，但只存在于推进控制机制。
The purpose of this study was to investigate whether or not the neuromuscular locomotor system is optimized at a unique speed by examining the variability of the ground reaction force (GRF) pattern during walking in relation to different constant speeds. Ten healthy male subjects were required to walk on a treadmill at 3.0, 4.0, 5.0, 6.0, 7.0, and 8.0 km/h. Three components [vertical (F-x), anteroposterior (F-y), and mediolateral (F-x) force] of the GRF were independently measured for similar to35 steps consecutively for each leg. To quantify the GRIP pattern, five indexes (first and second peaks of F-z, first and second peaks of F-y, and F-x peak) were defined. Coefficients of variation were calculated for these five indexes to evaluate the GRF variability for each walking speed. It became clear for first and second peaks of F-z and F-x peak that index variabilities increased in relation to increments in walking speed, whereas there was a speed (5.5-5.8 km/h) at which variability was minimum for first and second peaks of F-y, which were related to forward propulsion of the body. These results suggest that there is "an optimum speed" for the neuromuscular locomotor system but only for the propulsion control mechanism.