Seasonal Variation in the Responsiveness of the Melanopsin System to Evening Light: Why We Should Report Season When Collecting Data in Human Sleep and Circadian Studies

IF 2.1 Q3 CLINICAL NEUROLOGY
Isabel Schöllhorn, Oliver Stefani, Christine Blume, Christian Cajochen
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Abstract

It is well known that variations in light exposure during the day affect light sensitivity in the evening. More daylight reduces sensitivity, and less daylight increases it. On average days, we spend less time outdoors in winter and receive far less light than in summer. Therefore, it could be relevant when collecting research data on the non-image forming (NIF) effects of light on circadian rhythms and sleep. In fact, studies conducted only in winter may result in more pronounced NIF effects than in summer. Here, we systematically collected information on the extent to which studies on the NIF effects of evening light include information on season and/or light history. We found that more studies were conducted in winter than in summer and that reporting when a study was conducted or measuring individual light history is not currently a standard in sleep and circadian research. In addition, we sought to evaluate seasonal variations in a previously published dataset of 72 participants investigating circadian and sleep effects of evening light exposure in a laboratory protocol where daytime light history was not controlled. In this study, we selectively modulated melanopic irradiance at four different light levels (<90 lx). Here, we aimed to retrospectively evaluate seasonal variations in the responsiveness of the melanopsin system by combining all data sets in an exploratory manner. Our analyses suggest that light sensitivity is indeed reduced in summer compared to winter. Thus, to increase the reproducibility of NIF effects on sleep and circadian measures, we recommend an assessment of the light history and encourage standardization of reporting guidelines on the seasonal distribution of measurements.
黑视素系统对夜间光线反应的季节变化:为什么我们在收集人类睡眠和昼夜节律研究数据时应该报告季节
众所周知,白天光照的变化会影响晚上的光敏度。更多的日光会降低灵敏度,而更少的日光会增加灵敏度。平均而言,冬天我们在户外的时间比夏天少,接受到的光线也比夏天少得多。因此,在收集光对昼夜节律和睡眠的非图像形成(NIF)影响的研究数据时,它可能是相关的。事实上,仅在冬季进行的研究可能会导致比夏季更明显的NIF效应。在这里,我们系统地收集了关于夜间光照对NIF影响的研究在多大程度上包括季节和/或光照历史的信息。我们发现,在冬季进行的研究比在夏季进行的研究要多,而在睡眠和昼夜节律研究中,报告何时进行研究或测量个人光照史并不是目前的标准。此外,我们试图在先前发表的72名参与者的数据集中评估季节性变化,这些参与者在实验室协议中调查了夜间光照对昼夜节律和睡眠的影响,其中白天的光照历史没有控制。在本研究中,我们在四种不同的光照水平(<90 lx)下选择性地调制了褪黑辐照度。在这里,我们旨在通过探索性的方式结合所有数据集,回顾性地评估黑视素系统响应性的季节性变化。我们的分析表明,与冬季相比,夏季的光敏感性确实降低了。因此,为了提高NIF对睡眠和昼夜节律测量影响的可重复性,我们建议对光照史进行评估,并鼓励标准化测量数据季节性分布的报告指南。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Clocks & Sleep
Clocks & Sleep Multiple-
CiteScore
4.40
自引率
0.00%
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0
审稿时长
7 weeks
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