Mechanical and neural changes in plantar-flexor muscles after spinal cord injury in humans.
Mechanical and neural changes in plantar-flexor muscles after spinal cord injury in humans.
复制标题
人类脊髓损伤后跖屈肌的机械和神经变化。
DOI：
10.1038/sc.2015.9
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发表时间：
2015
期刊：
影响因子：
2.2
通讯作者：
Kawashima N.
中科院分区：
文献类型：
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作者：
Yaeshima K;Negishi D;Yamamoto S;Ogata T;Nakazawa K;Kawashima N.
研究设计：横断面研究。目的：确定慢性脊髓损伤（SCI）和痉挛状态患者损伤持续时间对跖屈肌弹性特性的影响。设置：日本国家残疾人康复中心。方法：共有16名慢性SCI患者（年龄，33±9.3岁;损伤部位，C6-T12;损伤持续时间，11-371个月）参加。采用改良Ashworth量表（MAS）评估踝跖屈肌痉挛。测量腓肠肌内侧、外侧和比目鱼肌的围度和肌肉厚度。此外，使用测力计以5 ° s-1的速度将脚踝从10个跖屈旋转到20个背屈，并记录脚踝角度和扭矩。在对数据进行归一化（将角度和扭矩的初始点设置为零）后，我们计算了峰值扭矩和能量。此外，用二阶和四阶多项式和指数（Sten-Knudsen）模型拟合角度-扭矩数据（归一化前后），并计算刚度指数（SI SOP、SI FOP、SI SK）和角度SLACK（跖屈肌被动扭矩等于零的角度）。在50、90、120和150 deg s− 1下，从0-10背屈确定牵张反射增益和偏移。结果：MAS、小腿围度、MG厚度、峰值扭矩和SI FOP均随伤后时间的延长而显著降低（r log-log=-0.63、-0.69、-0.63、-0.53和-0.55，P< 0.05）。结论：慢性SCI患者的跖屈肌弹性随损伤时间的延长而降低，其他研究者也观察到了类似的结果
Study design:Cross-sectional study.Objectives:To determine the effect of injury duration on plantar-flexor elastic properties in individuals with chronic spinal cord injury (SCI) and spasticity.Setting:National Rehabilitation Center for Persons with Disabilities, Japan.Methods:A total of 16 chronic SCI patients (age, 33±9.3 years; injury localization, C6-T12; injury duration, 11–371 months) participated. Spasticity of the ankle plantar-flexors was assessed using the Modified Ashworth Scale (MAS). The calf circumference and muscle thickness of the medial gastrocnemius (MG), lateral gastrocnemius and soleus were assessed using tape measure and ultrasonography. In addition, the ankle was rotated from 10 plantar-flexion to 20 dorsiflexion at 5 deg s− 1 with a dynamometer, and the ankle angle and torque were recorded. After normalizing the data (the initial points of angle and torque were set to zero), we calculated the peak torque and energy. Furthermore, angle–torque data (before and after normalization) were fitted with a second-and fourth-order polynomial, and exponential (Sten–Knudsen) models, and stiffness indices (SI SOP, SI FOP, SI SK) and Angle SLACK (the angle at which plantar-flexor passive torque equals zero) were calculated. The stretch reflex gain and offset were determined from 0–10 dorsiflexion at 50, 90, 120 and 150 deg s− 1. After logarithmic transformation, Pearson’s correlation coefficients were calculated.Results:MAS, calf circumference, MG thickness, peak torque and SI FOP significantly decreased with injury duration (r log-log=− 0.63,− 0.69,− 0.63,− 0.53 and− 0.55, respectively, P< 0.05). The peak torque and SI FOP maintained significant relationships even after excluding impacts from muscle morphology.Conclusion:Plantar-flexor elasticity in chronic SCI patients decreased with increased injury duration.Similar content being viewed by others