Ferdjallah Mohammed, Harris Gerald F, Smith Peter, Wertsch Jacqueline J
Orthopaedic and Rehabilitation Engineering Center, Marquette University, Milwaukee, WI, USA.
Clin Biomech (Bristol). 2002 Mar;17(3):203-10. doi: 10.1016/s0268-0033(01)00121-8.
To estimate the contribution of body transverse rotation using weighted differential center of pressure signals during quiet standing in healthy children and in children with cerebral palsy.
Body sway was indirectly measured through center of pressure data, which was calculated using dual force platforms.
Assessment of postural control synergies using center of pressure data provides a unique method for center of mass data analysis in characterizing complex balance sway.
Using dual force platforms, linear expressions for the coordinates of right and left center of pressure signals were developed to identify and characterize balance control synergies during quiet standing. Subjects were also tested during eyes open and eyes closed trials to determine the significance of visual input on these control synergies.
The limb protraction/retraction control was found to be dominant during medial-lateral sway, whereas the estimated body transverse rotation contribution was found to be more significant than the previously reported measures of anterior-posterior balance. These findings were consistent in healthy children and in children with cerebral palsy during both eyes open and eyes closed trials.
The weighted differential center of pressure signals show that the estimated body transverse rotation contribution is significant in healthy children and critical for postural stability in children with cerebral palsy.
This study identifies the significance of body transverse rotation control contribution in upright posture. Children with cerebral palsy with relatively poor ankle control demonstrate the importance of body transverse rotation for postural stability.
利用加权差分压力中心信号评估健康儿童和脑瘫儿童安静站立时身体横向旋转的作用。
通过双力平台计算得出的压力中心数据间接测量身体摆动。
利用压力中心数据评估姿势控制协同作用为分析复杂平衡摆动中的质心数据提供了一种独特方法。
使用双力平台，推导左右压力中心信号坐标的线性表达式，以识别和描述安静站立时的平衡控制协同作用。还对受试者进行了睁眼和闭眼试验，以确定视觉输入对这些控制协同作用的影响。
发现肢体前伸/后缩控制在内侧-外侧摆动中占主导地位，而估计的身体横向旋转作用比先前报道的前后平衡测量更为显著。这些发现在健康儿童和脑瘫儿童的睁眼和闭眼试验中均一致。
加权差分压力中心信号表明，估计的身体横向旋转作用在健康儿童中很显著，对脑瘫儿童的姿势稳定性至关重要。
本研究确定了身体横向旋转控制作用在直立姿势中的重要性。踝关节控制相对较差的脑瘫儿童证明了身体横向旋转对姿势稳定性的重要性。
