Tanii K
Electroencephalogr Clin Neurophysiol. 1984 May;57(5):435-40. doi: 10.1016/0013-4694(84)90073-7.
The aim of the present study was to investigate whether an EMG slower wave prior to a rapid straightening-up movement is associated with motor preparation to perform the movement. The straightening movement was performed at 6 load intensities and under 3 conditions: without any external load; with an additional load; lifting a load. The subject could freely begin the rapid movement from a moderate forward-bending position whenever he was fully ready for the beginning of the movement after he held the bent posture. Bipolar surface EMGs of the erector spinal muscles at the L1 and L4 level, the gluteus maximus muscle and the semitendinosus muscle were led by a pair of skin electrodes with a time constant of 0.03 sec. The signal from the hip goniometer was measured simultaneously to identify the period of the movement. A distinct relationship between the occurrence of the slower wave and both load intensities and conditions was not found. However, the rhythmic slower wave often occurred in the muscles 200-450 msec before the movement. The occurrence of the wave in the muscles was often simultaneous. The signal from the hip goniometer did not change with the occurrence of the slower wave. The amplitude of the slower wave increased frequently. The present results suggest that the slower wave may reflect a significant change of motoneuronal activity in connection with motor preparation to perform the movement.
本研究的目的是调查快速伸直动作之前的肌电图慢波是否与执行该动作的运动准备相关。伸直动作在6种负荷强度下和3种条件下进行：无任何外部负荷；附加负荷；举起负荷。受试者在保持弯曲姿势后，当完全准备好开始运动时，可从适度前倾位置自由开始快速动作。L1和L4水平竖脊肌、臀大肌和半腱肌的双极表面肌电图由一对时间常数为0.03秒的皮肤电极引出。同时测量髋部角度计的信号以确定运动周期。未发现慢波出现与负荷强度和条件之间存在明显关系。然而，有节奏的慢波常在运动前200 - 450毫秒出现在肌肉中。慢波在肌肉中的出现常常是同步的。髋部角度计的信号并不随慢波的出现而变化。慢波的幅度经常增加。目前的结果表明，慢波可能反映了与执行该动作的运动准备相关的运动神经元活动的显著变化。
