Parkington H C, Harding R, Sigger J N
Department of Physiology, Monash University, Clayton, Victoria, Australia.
J Reprod Fertil. 1988 Mar;82(2):697-705. doi: 10.1530/jrf.0.0820697.
The co-ordination of spontaneous and evoked electromyographic (EMG) activity was examined in the uterus of ewes from Day 100 of pregnancy and during labour. During pregnancy the onset of bursts of EMG activity was synchronous to within 2-3 min when recorded by electrodes at any recording site. Individual EMG spikes, whether occurring spontaneously or evoked by electrical stimulation of the myometrium, appeared to propagate between recording electrodes that were 1-3 cm apart, in the longitudinal or circular orientation of the uterus, but not when the electrodes were separated by more than 3 cm. Apparent conduction velocity in the longitudinal orientation was 7 cm sec-1 during pregnancy and increased to 13 cm sec-1 during labour. No consistent pattern could be distinguished in the sites at which EMG activity was first observed at any stage of pregnancy studied. The nature of propagation of EMG activity remains unresolved but it is clear that it is not initiated at a single site in the myometrium.
在怀孕100天的母羊子宫以及分娩期间，对自发和诱发的肌电图（EMG）活动的协调性进行了检查。在怀孕期间，当通过电极在任何记录部位进行记录时，EMG活动爆发的起始时间同步在2 - 3分钟内。单个EMG尖峰，无论是自发出现还是由子宫肌层的电刺激诱发，似乎都能在子宫纵向或环形方向上相距1 - 3厘米的记录电极之间传播，但当电极间距超过3厘米时则不能。怀孕期间纵向方向的表观传导速度为7厘米/秒，分娩期间增加到13厘米/秒。在所研究的怀孕任何阶段，首次观察到EMG活动的部位没有一致的模式。EMG活动的传播性质仍未解决，但很明显它不是在子宫肌层的单个部位起始的。
