Control of stance during lateral and anterior/posterior surface translations.
Control of stance during lateral and anterior/posterior surface translations.
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DOI：
10.1109/86.662618
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发表时间：
1998-03-01
期刊：
影响因子：
--
通讯作者：
Horak, F B
中科院分区：
文献类型：
--
作者：
Henry, S M;Fung, J;Horak, F B
本研究的目的是通过量化关节位置、双侧三维（3-D）地面反作用力以及下肢和躯干肌肉肌电图（EMG）活动来比较和对比对侧向和A/P表面平移的姿势反应。受试者站在一个可移动的平台上，该平台随机向四个不同的方向平移。响应于外侧和前/后（A/P）表面平移的运动学模式是相似的，因为小腿/大腿和躯干段依次发生位移和反转。虽然身体质心（CoM）位移相等，以响应横向和A/P平移，平衡保持通过重新分配的垂直力和改变对支撑表面施加的剪切力。这些力的反应是双边对称的A/P平移，但不是横向平移。对于EMG活动，第一个激活的肌肉是用于侧向平移的近端阔筋膜张肌，而第一个招募的是用于A/P平移的远端肌肉。这项研究的结果表明，姿势平衡的控制可能是类似的A/P和横向平移，虽然模式的具体差异可能反映了各种生物力学约束的躯干和下肢与两个平面的运动。
The purpose of this study was to compare and contrast postural responses to lateral and A/P surface translations by quantifying joint positions, bilateral three-dimensional (3-D) ground reaction forces, and lower limb and trunk muscle electromyographic (EMG) activity. Subjects stood on a movable platform which was randomly translated in four different directions. The kinematic patterns in response to lateral and anterior/posterior (A/P) surface translations were similar in that there was a sequential displacement and reversal of the shank/thigh and then trunk segments. While the body center of mass (CoM) was displaced equally in response to lateral and A/P translations, equilibrium was maintained by redistributing the vertical forces and changing the shear forces exerted against the support surface. These force responses were bilaterally symmetrical for A/P translations but not for lateral translations. With respect to EMG activity, the first muscle activated was the proximal tensor fascia latae for lateral translations whereas the distal muscles were recruited first for A/P translations. Results from this study suggest that control of postural equilibrium may be similar for A/P and lateral translations, although specific differences in patterns may reflect various biomechanical constraints of the trunk and the lower extremities associated with the two planes of movement.