Position as Well as Velocity Dependence of Spasticity-Four-Dimensional Characterizations of Catch Angle.
Position as Well as Velocity Dependence of Spasticity-Four-Dimensional Characterizations of Catch Angle.
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DOI：
10.3389/fneur.2018.00863
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发表时间：
2018
影响因子：
3.4
通讯作者：
Zhang LQ
中科院分区：
文献类型：
--
作者：
Wu YN;Park HS;Chen JJ;Ren Y;Roth EJ;Zhang LQ
我们使用便携式手动痉挛评估器定量研究了与中风痉挛相关的肌肉变化。方法：在康复医院的研究实验室中，对中风幸存者和健康对照者在受控被动肘部伸展下进行定量神经力学评估。十二名中风幸存者和九名健康对照者参与了这项研究。通过实时视听反馈控制速度，以 90°/s 和 270°/s 评估痉挛和抓角。以 30°/s 的慢速测定肘关节活动度 (ROM)、刚度和能量损失。联合分析关节位置、扭矩、速度和扭矩变化率等四维测量值来确定捕捉角度。结果：捕捉角度取决于拉伸速度，并且随着速度的增加而发生得更晚（p < 0.001），表明痉挛的位置依赖性。检查者在较高速度下感受到的较高阻力也是由于更极端的关节位置（关节角度），因为痉挛关节以较高速度显着进一步移动到更僵硬的肘部位置。中风幸存者表现出较小的 ROM (p < 0.001)、较高的刚度 (p < 0.001) 和较大的能量损失 (p = 0.005)。与对照组相比，中风幸存者表现出反射兴奋性增加，反射介导的扭矩更高（p < 0.001），速度更高（p = 0.02）。结论：痉挛的速度依赖性部分是由于关节角度位置依赖性，即关节以更高的速度进一步移动（到达感受到更高阻力的更僵硬的位置）。包括关节角度、速度、扭矩和扭矩变化率的“4维表征”提供了定量表征抓角和痉挛的系统工具。
We investigated the muscle alterations related to spasticity in stroke quantitatively using a portable manual spasticity evaluator. Methods: Quantitative neuro-mechanical evaluations under controlled passive elbow stretches in stroke survivors and healthy controls were performed in a research laboratory of a rehabilitation hospital. Twelve stroke survivors and nine healthy controls participated in the study. Spasticity and catch angle were evaluated at 90°/s and 270°/s with the velocities controlled through real-time audiovisual feedback. The elbow range of motion (ROM), stiffness, and energy loss were determined at a slow velocity of 30°/s. Four-dimensional measures including joint position, torque, velocity and torque change rate were analyzed jointly to determine the catch angle. Results: The catch angle was dependent on the stretch velocity and occurred significantly later with increasing velocity (p < 0.001), indicating position dependence of spasticity. The higher resistance felt by the examiner at the higher velocity was also due to more extreme joint position (joint angle) since the spastic joint was moved significantly further to a stiffer elbow position with the higher velocity. Stroke survivors showed smaller ROM (p < 0.001), higher stiffness (p < 0.001), and larger energy loss (p = 0.005). Compared to the controls, stroke survivors showed increased reflex excitability with higher reflex-mediated torque (p < 0.001) and at higher velocities (p = 0.02). Conclusion: Velocity dependence of spasticity is partially due to joint angle position dependence with the joint moved further (to a stiffer position where higher resistance was felt) at a higher velocity. The “4-dimensional characterization” including the joint angle, velocity, torque, and torque change rate provides a systematic tool to characterize catch angle and spasticity quantitatively.
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影响因子：
3.2
作者：
DIFABIO, RP
通讯作者：
DIFABIO, RP
影响因子：
11
作者：
Lee, HM;Huang, YZ;Hwang, IS
通讯作者：
Hwang, IS
DOI：
10.1097/00004356-200103000-00003
发表时间：
2001-03-01
影响因子：
1.7
作者：
Allison, SC;Abraham, LD
通讯作者：
Abraham, LD
DOI：
10.1109/tnsre.2013.2291203
发表时间：
2014-03-01
影响因子：
4.9
作者：
Kang, Sang Hoon;Lee, Song Joo;Zhang, Li-Qun
通讯作者：
Zhang, Li-Qun
DOI：
10.1016/j.apmr.2003.11.041
发表时间：
2004-10-01
影响因子：
4.3
作者：
Chung, SG;van Rey, E;Zhang, LQ
通讯作者：
Zhang, LQ