Graduate School of Health Sciences, Graduate School of Kansai University of Health Sciences, Osaka, Japan.
NeuroRehabilitation. 2013;33(1):171-6. doi: 10.3233/NRE-130942.
It is unclear whether mental simulation without actual muscle contraction associated with actual motion can increase the excitability of the spinal neural function.
To determine the best method for mental simulation without actual muscle contraction, we analyzed the F-wave of thenar muscles after stimulating the median nerve by motor imagery whilst holding the sensor of a pinch meter between the thumb and index finger and without holding the sensor.
Healthy volunteers (n = 11; mean age, 34 years) participated in this study after providing informed consent. We examined the F-wave of the left thenar muscles after stimulating the left median nerve at the wrist at rest and under holding and motor imagery conditions. For the motor imagery condition, the subjects were asked to establish 50% maximal voluntary contraction (MVC) of isometric contraction while holding the sensor between the thumb and index finger (motor imagery with the sensor condition) and without holding the sensor on another day (motor imagery without the sensor condition).
The persistence and amplitude ratio of F/M during motor imagery with or without the sensor was better than that during relaxation. In particular, this ratio was significantly higher under the with sensor condition than under the without sensor condition.
Movement preparation for a motor imagery task involving 50% MVC isometric contraction of the opponens pollicis is important.
目前尚不清楚是否可以通过与实际运动无关的精神模拟来增加脊髓神经功能的兴奋性。
为了确定无需实际肌肉收缩的最佳精神模拟方法，我们通过在拇指和食指之间夹着捏力计的传感器进行运动想象的同时不夹传感器来刺激正中神经，分析大鱼际肌的 F 波。
在获得知情同意后，我们招募了 11 名健康志愿者（平均年龄 34 岁）参与本研究。我们在休息、握持和运动想象状态下分别刺激左手腕正中神经后，检查左手大鱼际肌的 F 波。对于运动想象状态，要求参与者在拇指和食指之间夹着传感器进行 50%最大自主收缩（MVC）的等长收缩（夹传感器的运动想象状态），而在另一天不夹传感器进行（不夹传感器的运动想象状态）。
在有或没有传感器的运动想象过程中，F/M 的持续时间和幅度比在放松时更好。特别是，在夹传感器条件下，该比值明显高于不夹传感器条件。
对于涉及拇指对掌肌 50% MVC 等长收缩的运动想象任务，运动准备很重要。
