Biomechanical analysis of sit-to-stand transfer in healthy and paraplegic subjects
Biomechanical analysis of sit-to-stand transfer in healthy and paraplegic subjects
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DOI：
10.1016/s0268-0033(99)00044-3
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发表时间：
2000-02-01
影响因子：
1.8
通讯作者：
Schmidt, G
中科院分区：
文献类型：
--
作者：
Bahrami, F;Riener, R;Schmidt, G
目标。对有/无手臂支撑的健康成人和有/无股四头肌电刺激的截瘫患者进行了坐立转位的实验研究。本研究旨在比较健康受试者和截瘫受试者的关节扭矩、动量转移假说和坐立转移的稳定性。采用平面三连杆刚体模型，根据测量数据计算了人体各节段的线动量以及关节处的反力和扭矩。在健康受试者中，手臂支撑扩大了身体的支撑基础，从而增加了姿势的稳定性。强有力的手臂辅助使髋关节和膝关节的最大扭矩减少50%以上。观察到，健康的受试者在手臂支撑下站起来，使用动量转移来促进从坐着到站立的转变。截瘫患者没有应用动量转移策略，坐-立转移是以准静态的方式完成的。刺激股四头肌，腿部可参与部分运动动力学。我们的结果表明截瘫患者的站立动作与健康成人用胳膊支撑站起的策略有一些显著的差异。
Objective. An experimental study of the sit-to-stand transfer in healthy adults with/without arm-support and in paraplegic patients with/without electrical stimulation of the quadriceps muscles was performed. The study was aimed to compare the joint torques, momentum transfer hypothesis, and stability of the sit-to-stand transfer in the healthy and paraplegic subjects.Methods. A planar 3-linkage rigid body model was used to compute the body-segmental linear momentum and the reaction forces and torques at the joints from measured data.Results. In healthy subjects the arm-support enlarged the support base of the body and thus, increased the postural stability. Strong arm-assistance reduced the maximum hip and knee joint torques by more than 50%. It was observed that the healthy participants rising with arm-support used momentum transfer to facilitate the transition from sitting to standing. The paraplegic participants did not apply the momentum transfer strategy and the sit-to-stand transfer was accomplished in a quasi-static manner. Stimulating the quadriceps, the legs could participate partly in the movement dynamics.Conclusion. Our results indicate that some significant differences exist between the maneuver applied by the paraplegic patients to stand up and the strategies used by the healthy adults rising with arm-support.