期刊
INFANT BEHAVIOR & DEVELOPMENT
卷 29, 期 2, 页码 143-152出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.infbeh.2005.11.001
关键词
actigraphy; sleep; circadian; ultradian; rhythm; periodogram
The development of the 24-h rest-activity pattern was investigated in human infants under naturalistic conditions as assessed by continuous actigraphy. Seven infants and their mothers were recorded for 4 (n = 1), 6 (n = 5) and 12 months (n = 1) after birth. Periodograrn analysis of rest-activity data was performed over consecutive 10-day intervals. A weak 24-h rest-activity pattern was already present in some infants during the newborn period. The magnitude of the 24-h component in individual periodograms increased across the first months following a saturating function. The time constants of fitted saturating exponential functions reflecting the rate of development of the 24-h pattern - ranged from 49 to 110 days (n = 6) indicating a large interindividual variability. Furthermore, intraindividual variation was observed; the magnitude of the 24-h rest-activity component showed fluctuations around the trend. Miniaturized actigraphs are ideal tools for long-term longitudinal monitoring of rest-activity behavior in infants. (c) 2005 Elsevier Inc. All rights reserved.
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