Swartjes J M, van Geijn H P, Mantel R, van Woerden E E, Schoemaker H C
Department of Obstetrics and Gynaecology, Academisch Ziekenhuis Vrije Universiteit, Amsterdam, The Netherlands.
Early Hum Dev. 1990 Aug;23(2):75-83. doi: 10.1016/0378-3782(90)90130-b.
The fetal behavioural state concept was used to study fetal rest-activity cycles in normal pregnancies at gestational ages of 32 and 38 weeks. In addition, it was investigated if clustering of fetal movements was already present in recordings obtained at 20 weeks. At 20 weeks, 17 periods lasting longer than 3 min were found in which fetal body movements were absent. The mean duration of these periods was 4.0 +/- 0.8 min. On the basis of random scattering of movements on a time axis, it appeared unlikely that these periods of inactivity occurred by chance alone. At 32 and 38 weeks, data on body movements were combined with data on eye movements and the FHR pattern. At 32 weeks, true fetal behavioural states were not found. The average coincidence of 1F to 4F was 58%, while only 23% was to be expected if state parameters had fulfilled state criteria purely by chance. At 38 weeks, coincidence of 1F to 4F had increased to 80% (P less than 0.001). Expected coincidence purely by chance was 30%. True fetal behavioural states were found in 17 out of 35 recordings. For transitions from 1F into 2F, the FHR changed relatively early, i.e. as first or second parameter, while for the reverse transitions it changed relatively late (P less than 0.05). There was no clearly preferred sequence for body and eye movements within transitions.
胎儿行为状态概念被用于研究孕32周和38周正常妊娠中的胎儿休息 - 活动周期。此外，还研究了在20周获得的记录中是否已经存在胎儿运动的聚集现象。在20周时，发现了17个持续时间超过3分钟的时间段，其中没有胎儿身体运动。这些时间段的平均持续时间为4.0 +/- 0.8分钟。基于运动在时间轴上的随机分布，这些不活动时间段仅靠偶然出现的可能性似乎不大。在32周和38周时，身体运动数据与眼动数据和胎儿心率模式数据相结合。在32周时，未发现真正的胎儿行为状态。1F到4F的平均符合率为58%，而如果状态参数纯粹偶然满足状态标准，预期符合率仅为23%。在38周时，1F到4F的符合率增加到80%（P小于0.001）。纯粹偶然的预期符合率为30%。在35份记录中的17份中发现了真正的胎儿行为状态。对于从1F转变为2F，胎儿心率变化相对较早，即作为第一个或第二个参数，而对于相反的转变，它变化相对较晚（P小于0.05）。在转变过程中，身体和眼动没有明显优先的顺序。
