ULTRADIAN COMPONENTS OF THE SLEEP WAKE CYCLE IN BABIES

被引:34
作者
MENNABARRETO, L [1 ]
BENEDITOSILVA, AA [1 ]
MARQUES, N [1 ]
DEANDRADE, MMM [1 ]
LOUZADA, F [1 ]
机构
[1] UNIV SAO PAULO,FAC MED,DEPT CLIN MED,SAO PAULO,BRAZIL
基金
巴西圣保罗研究基金会;
关键词
ULTRADIAN; SLEEP WAKE; HUMAN; ONTOGENY; SPECTRAL ANALYSIS;
D O I
10.3109/07420529309059698
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Behavioral states may be analyzed as expressions of underlying cyclic activity involving several physiological systems. The human sleep-wake cycle in the first year of life shows, in addition to the establishment of circadian rhythmicity around the second month, the dynamics of its ultradian components, as can be seen in the more or less gradual decline of the polyphasic pattern. To detect these changes, we have analyzed the sleep-wake cycle of five babies of different ages (3, 4, 9, 11, and 13 months) observed for 5 consecutive days (Monday through Friday), 10 h (08:00-18:00 h) per day at a kindergarten by the first author, and during the night (18:00-08:00 h) by the parents. Behavioral observations were designed for minimizing interference with the babies' habits. Sleep/wake data were arranged in 60-min intervals, and the relative amount of time spent asleep per interval constituted the time series submitted for statistical analysis. The five resulting time series were submitted to spectral analysis for detecting the composition of frequencies contributing to the observed sleep/wake cycle. Several frequencies were thus obtained for each baby in the ultradian and circadian domain, ranging from one cycle in 2.0 h to one cycle in 24 h. The circadian component was the strongest rhythmic influence for all individuals except for the youngest (3-month-old) baby, who showed a semicircadian component as the main frequency in the power spectrum. Three individuals showed ultradian frequencies in the domain of 3-4 h. Differences in the spectra derive from three possible, and probably not exclusive, causes: 1) ontogenetic changes, 2) different masking effects, and 3) individual differences.
引用
收藏
页码:103 / 108
页数:6
相关论文
共 8 条