Biomechanical analysis of failed sit-to-stand.
Biomechanical analysis of failed sit-to-stand.
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DOI：
10.1109/86.650289
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发表时间：
1997-12-01
期刊：
影响因子：
--
通讯作者：
Popat, R A
中科院分区：
文献类型：
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作者：
Riley, P O;Krebs, D E;Popat, R A
背景坐立（STS）失败是一种短暂的平衡丧失，可能导致老年人跌倒。本文的目的是描述失败的 STS 与成功的 STS 的不同机制。作者将 11 名正常老年人的成功 STS 与 13 名受试者中的 20 名“坐姿式”和 20 名“台阶式”失败的 STS 进行了比较。运动学和动力学数据被纳入我们的 11 节段全身模型中，以估计净关节力和扭矩以及身体节段动量。组间在动量产生和消散的大小和时间、膝关节伸肌扭矩和垂直地面反作用力的大小方面存在显着差异。这两种失败的从坐到站的动作都没有成功的起身更有活力。 STS 失败可能是由于无力或平衡控制和协调障碍，或两者兼而有之，导致精力不足。需要进一步研究来区分这两种可能的损害来源。确定功能限制的根本原因对于制定有效的干预措施是必要的。
Background sit-to-stand (STS) failure is a transient loss of balance that can engender falls among elders. The purpose of this paper is to describe the mechanisms whereby failed STS differs from successful STS. The authors compared successful STS from 11 normal elders to 20 "sitback" and 20 "step" type failed STS's in 13 subjects. Kinematic and kinetic data were incorporated into our 11-segment whole body model to estimate the net joint forces and torques and body segment momenta. Significant between group differences in the magnitude and timing of momentum generation and dissipation, knee extensor torques and the magnitude of the vertical ground reaction force were identified. Both types of failed sit-to-stand maneuvers are less energetic than successful rises. STS failures might result from either weakness or balance control and coordination impairment, or both, resulting in an insufficiently energetic effort. Further research is required to differentiate between these two possible sources of impairment. Determining the root cause of functional limitations is necessary to develop effective interventions.