Movement Variability and Muscle Activity Relative to Center of Pressure During Unipedal Stance on Solid and Compliant Surfaces
Movement Variability and Muscle Activity Relative to Center of Pressure During Unipedal Stance on Solid and Compliant Surfaces
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DOI：
10.1123/mcj.12.4.283
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发表时间：
2008-10-01
期刊：
影响因子：
1.1
通讯作者：
Zernicke, Ronald F.
中科院分区：
文献类型：
--
作者：
Croft, James L.;von Tscharner, Vinzenz;Zernicke, Ronald F.
顺应性表面用于挑战姿势稳定性，但评估通常仅限于压力中心的汇总测量，无法深入了解运动协调的时间动态。在这里，我们测量了三个表面（固体，泡沫和充气椎间盘）上的压力中心变化，并量化了关节角度和肌肉活动变化相对于压力中心变化的相对时间。9名活跃的男性受试者（20-30岁）在三个表面中的每一个上进行了10次30秒的单足站立试验。摇摆范围，平均摇摆，平均摇摆速度，路径长度，并拟合椭圆面积增加，单调，从固体表面泡沫充气盘。与固体表面相比，柔顺表面的显著互相关的数量更大。肌肉活动先于压力中心位移的变化，表面类型影响了内外侧方向上的导联幅度。压力中心在内外侧方向上更受限制，表面不稳定。
Compliant surfaces are used to challenge postural stability, but assessments are frequently limited to summary measures of center of pressure that do not provide insights into the temporal dynamics of motor coordination. Here, we measured center-of-pressure changes on three Surfaces (solid, foam, and air-filled disc) and quantified the relative timing of changes in joint angles and muscle activity with respect to center-of-pressure changes. Nine active male subjects (20-30 years old)performed ten 30-s trials of unipedal stance on each of the three surfaces. Sway range, mean sway, mean sway velocity, path length, and fitted ellipse area increased, monotonically, from solid surface to foam to air-filled disc. The number of significant cross-correlations was greater for the compliant surfaces compared with the solid surface. Muscle activity preceded changes in center-of-pressure displacement, with the type of surface affecting the magnitude Of the lead ill the mediolateral direction. Center of pressure was more constrained oil less stable Surfaces and in the mediolateral direction.