title: Factors affecting sleep spindle activity during infancy.
abstract: Sleep spindle activity was evaluated in 32 twins at 52 weeks postconceptional age. Significantly increased mature spindle activity was seen in infants born at older gestational ages, in femals, and in infants who were stressed by intra-uterine growth retardation or with mild postnatal respiratory illness.
mesh_terms: D002540:Cerebral Cortex / Q000502:physiology; D004569:Electroencephalography; D005071:Evoked Potentials; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D011247:Pregnancy; D012737:Sex Factors; D012894:Sleep Stages / Q000502:physiology*; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic