Asaka Yoko, Takada Satoshi
Faculty of Nursing and Rehabilitation, Konan Women's University, Kobe, Hyogo.
No To Hattatsu. 2011 Nov;43(6):448-52.
The objective of this study is to identify the developmental changes in nocturnal sleep behaviors among preterm infants in comparison with full-term infants (control group). The subjects were 18 preterm infants and 23 full-term infants with mean gestational weeks of 26.5 +/- 2.3 and 39.1 +/- 1.3, and average weights of 879 +/- 188 g and 2,940 +/- 352 g, respectively. Sleep measures were obtained through Actigraph (Micro-mini RC, Ambulatory Monitoring Inc., Ardsley, NY) over a week-long period. Results showed that the sleep duration was significantly different depending on the corrected age of months in only the preterm group (Preterm group: 504 +/- 55 min in under 12 months group, 543 +/- 68 min in over 13 months group. Full-term group: 548 +/- 68 min in under 12 months group, 544 +/- 79 min in over 13 months group). ACTX (percentage of minutes with higher than 0 activity score) was significantly higher for the preterm infants at both age groups in months. In conclusion, the nocturnal sleep duration of preterm infants reached the same level as those of full-term infants after the age of 13 corrected months. Also preterm infants were found to have a higher percentage of less restful sleep during nighttime. Further research is needed to understand the developmental course of physical activity during night time of preterm infants.
本研究的目的是确定与足月儿（对照组）相比，早产儿夜间睡眠行为的发育变化。研究对象为18名早产儿和23名足月儿，其平均孕周分别为26.5±2.3周和39.1±1.3周，平均体重分别为879±188克和2940±352克。通过活动记录仪（微型RC，动态监测公司，纽约州阿兹利）在为期一周的时间内获取睡眠测量数据。结果显示，仅在早产儿组中，睡眠时间根据校正月龄有显著差异（早产儿组：12个月以下组为504±55分钟，13个月以上组为543±68分钟。足月儿组：12个月以下组为548±68分钟，13个月以上组为544±79分钟）。在两个月龄组中，早产儿的ACTX（活动评分高于0的分钟百分比）均显著更高。总之，校正月龄13个月后，早产儿的夜间睡眠时间达到了与足月儿相同的水平。此外，还发现早产儿夜间睡眠质量较差的百分比更高。需要进一步研究以了解早产儿夜间身体活动的发育过程。
