Effects of 2-hour nighttime nap on melatonin concentration and alertness during 12-hour simulated night work

Sang Il Lee, Takeshi Nishi, Masaya Takahashi, Shigekazu Higuchi

    研究成果: ジャーナルへの寄稿学術誌査読

    抄録

    A nighttime nap is expected to mitigate melatonin suppression during night work by blocking light input to the retina, but it is unclear. In the present study, we investigated the effects of a nap break on melatonin level, subjective sleepiness, and vigilance performance during simulated night work. Eleven healthy young males (mean ± SD age: 22.2 ± 4.1 years) participated in counterbalanced crossover design experiments with two conditions (nap vs. no nap). The subjects performed 12-hour simulated night work from 21:00 to 09:00 h (illuminance: ~500 lx). Subjects with a nap condition took a nap for 2 hours in a dark room from 03:00, while subjects with a no nap condition continued the simulated night work. The results showed that immediately after the 2-h nap break, the melatonin level at 05:00 h temporarily recovered from light-induced melatonin suppression during the simulated night work but significantly suppressed again at 07:00 and 09:00 h. Subjective alertness and vigilance performance were impaired immediately after the nap break but subsequently enhanced. The results suggest that a single nap break for 2 hours could be a strategy to enhance alertness during the last part of night shift but inadequate for mitigating melatonin suppression.

    本文言語英語
    ページ(範囲)393-402
    ページ数10
    ジャーナルIndustrial health
    59
    6
    DOI
    出版ステータス出版済み - 2021

    !!!All Science Journal Classification (ASJC) codes

    • 公衆衛生学、環境および労働衛生
    • 健康、毒物学および変異誘発

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