The Circadian Response to Evening Light Spectra in Early Childhood: Preliminary Insights

褪黑素 昼夜节律 傍晚 就寝时间 光强度 医学 听力学 日光 相位响应曲线 内科学 心理学 生物钟 光学 物理 天文
作者
Lauren E. Hartstein,Kenneth P. Wright,Cecilia Diniz Behn,Shelby R. Stowe,Monique K. LeBourgeois
出处
期刊:Journal of Biological Rhythms [SAGE Publishing]
标识
DOI:10.1177/07487304241311652
摘要

Although the sensitivity of the circadian system to the characteristics of light (e.g., biological timing, intensity, duration, spectrum) has been well studied in adults, data in early childhood remain limited. Utilizing a crossover, within-subjects design, we examined differences in the circadian response to evening light exposure at two different correlated color temperatures (CCT) in preschool-aged children. Healthy, good sleeping children ( n = 10, 3.0-5.9 years) completed two 10-day protocols. In each protocol, after maintaining a stable sleep schedule for 7 days, a 3-day in-home dim-light circadian assessment was performed. On the first and third evenings of the in-home protocol, dim-light melatonin onset (DLMO) was assessed. On the second evening, children received a 1-h light exposure of 20 lux from either 2700 K (low CCT) or 5000 K (high CCT) (~9 and ~16 melanopic equivalent daylight illuminance (mEDI lux), respectively) centered around their habitual bedtime. Children received the remaining light condition during their second protocol, with the order counterbalanced across participants. Salivary melatonin was collected to compute melatonin suppression and circadian phase shift resulting from each experimental light condition. Melatonin suppression across the 1-h light stimulus was significantly greater during exposure to the high CCT light ( M = 56.3%, SD = 19.25%) than during the low CCT light ( M = 23.90%, SD = 41.06%). Both light conditions resulted in marked delays of circadian timing, but only a small difference ( d = −0.25) was observed in the delay between the 5000 K ( M = 35.3 min, SD = 34.3 min) and 2700 K ( M = 26.7 min, SD = 15.9 min) conditions. Together, these findings add to a growing literature demonstrating high responsivity of the circadian clock to evening light exposure in early childhood and provide preliminary evidence of melatonin suppression sensitivity to differences in light spectrum in preschool-aged children.
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