Asaka Yoko, Takada Satoshi
Kobe University Graduate School of Health Sciences, Japan.
Brain Dev. 2010 Feb;32(2):150-5. doi: 10.1016/j.braindev.2008.12.006. Epub 2009 Jan 10.
The aim of this study is to identify the characteristics of sleep behaviors assessed from activity data among very low-birth weight (VLBW) preterm infants in comparison to full-term infants at the age of around 12 corrected months, due to the possibility that sleep behaviors of preterm infants may be different from those of full-term infants.
Cross-sectional study. Infant sleep measures were obtained through actigraphs (Micro-mini RC, Ambulatory Monitoring Inc., Ardsley, NY), which were attached to the infants' ankles during a week-long period. The subjects were 14 preterm infants and 14 full-term infants in which the mean ages were 13.3+/-2.1 corrected months and 12.3+/-2.4 month, respectively.
Preterm infants showed significantly less sleep duration during nighttime than full-term infants. The mean activity score and ACTX (Activity Index: percentage minutes with more than 0 activity score) of preterm infants during nighttime were significantly higher than those of full-term infants. No significant differences in total sleep duration, daytime sleep duration, the number of night-wakings, and sleep efficiency were found between the two groups.
Preterm infants slept less and had a larger percentage of less restful sleep during nighttime. The results indicated that prematurity at the time of birth remained throughout the developmental course of sleep behaviors among preterm infants at around the age of 12 corrected months.
本研究旨在确定极低出生体重（VLBW）早产儿与足月出生婴儿在约12个校正月龄时从活动数据评估的睡眠行为特征，因为早产儿的睡眠行为可能与足月儿不同。
横断面研究。通过活动记录仪（Micro-mini RC，动态监测公司，纽约州阿兹利）获取婴儿睡眠测量数据，记录仪在为期一周的时间内附着于婴儿脚踝。研究对象为14名早产儿和14名足月儿，其平均年龄分别为13.3±2.1个校正月龄和12.3±2.4个月。
早产儿夜间睡眠时间明显少于足月儿。早产儿夜间的平均活动评分和ACTX（活动指数：活动评分大于0的分钟百分比）显著高于足月儿。两组在总睡眠时间、白天睡眠时间、夜间醒来次数和睡眠效率方面未发现显著差异。
早产儿夜间睡眠时间较少，且睡眠不安稳的比例较高。结果表明，出生时的早产在约12个校正月龄的早产儿睡眠行为发育过程中持续存在。
