Effects of tryptophan intake and light exposure during the daytime on sleep factors

本研究的目的是通过改变早餐色氨酸的摄入量和白天的光照，以及测量睡眠质量和夜间褪黑激素的分泌，来研究色氨酸摄入和光照对睡眠和褪黑激素分泌的影响。33名男大学生完成了为期5天4夜的实验。受试者被随机分为4组：早晨缺乏色氨酸的早餐(55 mg/餐)和白天昏暗的光环境(&lt；50lx)；富含色氨酸的早餐(476 mg/餐)和暗光、缺乏色氨酸的早餐和强光(&gt；5000lx)；富含色氨酸的早餐和强光。Poor*Dim组第四天的唾液褪黑素浓度显著低于第一天，而Rich*Bright组第四天的唾液褪黑素浓度高于第一天。结果表明，富含色氨酸的早餐和白天的强光照射相结合，可以促进夜间褪黑激素的分泌。

The purpose of this study is to investigate effects of tryptophan intake and light exposure on sleep and melatonin secretion, by modifying tryptophan ingestion at breakfast and light exposure during the daytime, and measuring sleep quality and melatonin secretion at night. Thirty three of male University students completed the experiments lasting 5 days and 4 nights. The subjects were randomly divided into 4 groups: tryptophan-poor breakfast (55mg/meal) in the morning and dim light environment (<50lx) during daytime, tryptophan-rich breakfast (476mg/meal) and dim light, tryptophan-poor breakfast and bright light (>5000lx), tryptophan-rich breakfast and bright light. Saliva melatonin concentrations on the fourth day was significantly lower than on the first day in Poor*Dim, whereas it was higher on the fourth day in Rich*Bright. The result indicates that the combination of a tryptophan-rich breakfast and bright light exposure during daytime could promote melatonin secretion at night.