等尺性収縮を用いた母指対立運動の運動イメージの効果には性差があるか : F波を用いた検討

概要

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To study spinal neural function during motor imagery tasks, we analyzed F-wave of left thenar muscles after stimulating the left median nerve at the wrist at rest, and under touch and motor imagery conditions in 14 healthy subjects (7 males and 7 females; mean age, 30.8 years). Touch condition was defined as holding the sensor of the pinch meter between the thumb and index finger. For the motor imagery condition, the subjects were asked to imagine holding the sensor between the thumb and index finger, i.e., isometrically contracting opponens pollicis, and the contraction obtained at 50% MVC(maximum voluntary contraction) was recorded. We investigated (1) the F-wave response during motor imagery and (2) the relationship between motor imagery and gender. (1) Persistence during the touch and motor imagery conditions was significantly higher than that at rest (paired t-test; p<0.01). The amplitude ratio of F/M during motor imagery was significantly higher than that at rest (paired t-test; p<0.01). The F/M ratio during the touch condition tended to increase compared with that recorded at rest. There were no other significant differences in findings among these three conditions. (2) No significant difference in F-wave responses was observed between the male and female groups. Hence, it is suggested that F-wave response during motor imagery involving isometric opponens pollicis contraction at 50% MVC was not affected by gender.
関西医療大学の論文