Kiuchi M, Nagata N, Ikeno S, Terakawa N
Department of Obstetrics and Gynecology, Tottori University School of Medicine, 36-1 Nishimachi, 683-8504, Yonago, Japan.
Early Hum Dev. 2000 May;58(2):153-65. doi: 10.1016/s0378-3782(00)00074-8.
To determine the effects of external light stimulation on fetal behavioral states and know the difference from those of vibroacoustic stimulation.
A flashlight and a vibroacoustic stimulator was applied directly on the maternal abdomen to determine the response of 56 normal fetuses at 36-40 weeks gestation. Fetal heart rate (FHR) and body movements were recorded using an actocardiograph, and fetal eye movements were observed using real-time ultrasonography. Using Nijhuis's criteria, the fetal behavioral states (1F-4F) were determined. FHR acceleration was considered a fetal response to the stimulations.
The lag time between stimulation and fetal response was within 4 s. A positive response rate to the light stimulation was higher at behavioral states 2F (82%) and 3F (83%) than at state 1F (4%). Light stimulation changed the behavioral state of two of the six 3F fetuses (33%) from 3F to 4F. No change of state was observed in fetuses that were in states 1F and 2F. For vibroacoustic stimulation, fetal response was 100% positive and changes of states were observed frequently irrespective of the behavioral state before the stimulation.
Fetal response to light stimulation is closely connected to fetal behavioral states and may reflect some distinct stages of the sleep-wakefulness cycle.
确定外部光刺激对胎儿行为状态的影响，并了解其与振动声刺激影响的差异。
将手电筒和振动声刺激器直接置于孕妇腹部，以确定56例孕36 - 40周正常胎儿的反应。使用心动描记仪记录胎儿心率（FHR）和身体运动，并用实时超声观察胎儿眼球运动。采用尼胡伊斯标准确定胎儿行为状态（1F - 4F）。FHR加速被视为胎儿对刺激的反应。
刺激与胎儿反应之间的延迟时间在4秒以内。在行为状态2F（82%）和3F（83%）时，对光刺激的阳性反应率高于状态1F（4%）。光刺激使6例处于3F状态的胎儿中有2例（33%）的行为状态从3F转变为4F。处于1F和2F状态的胎儿未观察到状态变化。对于振动声刺激，胎儿反应的阳性率为100%，且无论刺激前的行为状态如何，均频繁观察到状态变化。
胎儿对光刺激的反应与胎儿行为状态密切相关，可能反映了睡眠 - 觉醒周期的一些不同阶段。
