Bridging the gap: examining circadian biology and fatigue alongside work schedules

Malena Mul Fedele, Leandro P. Casiraghi, Santiago A. Plano, Giannina Bellone, Diego A. Golombek, Daniel E. Vigo
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Abstract

We compared three different work schedules in a large oil company: 1) two days of 12 h of daytime shifts followed by two consecutive 12 h night shifts, followed by four work-free days (“2 x 2 x 4”), 2) four consecutive 12 h daytime shifts and four consecutive 12 h night shifts, flanked by four work-free days (“4 x 4 x 4”), 3) a non-rotating schedule involving continuous 12 h daytime shifts during 40 days (“fixed 12 h”). We measured wrist-actigraphy, peripheral temperature rhythms, and subjective self-reports regarding fatigue, somnolence, and psycho-affective features. Sleep duration on the resting period was significantly less than the recommended 7 h. The “2 x 2 x 4” schedule resulted in decreased sleep regularity and increased circadian disruption, higher levels of insomnia, increased fatigue impact, lower alertness levels, and heightened symptoms of depression associated with more nocturnal sleep time after diurnal work. Our findings indicate that health and safety vary depending on the type of schedule employed.

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缩小差距:研究昼夜节律生物学和疲劳与工作时间表的关系
我们比较了一家大型石油公司的三种不同工作安排:1)两天 12 小时的白班,然后是连续两次 12 小时的夜班,接着是四天的无工作日("2 x 2 x 4");2)连续四次 12 小时的白班和连续四次 12 小时的夜班,中间是四天的无工作日("4 x 4 x 4");3)40 天内连续 12 小时白班的非轮换时间表("固定 12 小时")。我们测量了腕动仪、外周温度节律以及有关疲劳、嗜睡和心理情感特征的主观自我报告。2 x 2 x 4 "时间表导致睡眠规律性降低、昼夜节律紊乱加剧、失眠程度升高、疲劳影响增加、警觉性降低,以及与昼间工作后夜间睡眠时间增加有关的抑郁症状加剧。我们的研究结果表明,健康和安全因采用的时间表类型而异。
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