Self-reported discomfort associated with Daylight Saving Time in Brazilian tropical and subtropical zones
Self-reported discomfort associated with Daylight Saving Time in Brazilian tropical and subtropical zones
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DOI：
10.1080/03014460.2017.1355982
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发表时间：
2017-01-01
影响因子：
1.7
通讯作者：
Pedrazzoli, Mario
中科院分区：
文献类型：
--
作者：
Nascimento de Alencar, Joao Carlos;Leocadio-Miguel, Mario Andre;Pedrazzoli, Mario
背景：夏令时(DST)每年将时钟向前拨1小时，此时白天比夜晚长。之前在中高纬度地区的研究已经指出，DST对人类昼夜节律有破坏作用。由于巴西是实施降温的赤道国家，光同步器和社会同步器之间的不同关系可能会干扰降温效果。目的：了解巴西居民(纬度12-33度S，西经39-57度)与降温相关的自我报告不适的发生率和持续时间。结果：在所有样本中，45.43%的人报告没有与DST有关的不适，所有的时间类型都有意义。然而，夜晚与不适的关系最大。大约四分之一的样本报告在整个DST期间感到不适。结论：低纬地区的DST可能会对昼夜节律产生干扰，因为赤道附近日出的季节性可以忽略或非常温和。
Background: Daylight Saving Time (DST) annually moves clocks 1 hour forward, when daytime is longer than night. Previous studies from medium and high latitude locations have pointed to a disruptive effect of DST on human circadian rhythms. Since Brazil is an equatorial country implementing DST, a different relationship between photic and social synchronisers may interfere with DST effects.Aim: To explore the prevalence and duration of self-reported discomfort related to DST among Brazilian residents (latitude 12-33 degrees S, longditude 39-57 degrees W). It was hypothesised that an elevated prevalence of self-reported discomfort would be found in Brazil, due to the pronounced uncoupling between social and geophysical synchronisers.Subjects and methods: In total, 12 467 volunteers completed a web-based, Brazilian version of Horne-ostberg Morningness-Eveningness Questionnaire, provided demographic information, and answered questions related to DST complaints (discomfort, duration of discomfort).Results: Of the total sample, 45.43% reported no discomfort related to DST, with meaningful proportions for all chronotypes. However, eveningness was most associated with discomfort. About one fourth of the total sample reported discomfort over the whole DST period. Gender interaction is largely supported by these results.Conclusions: DST at low latitude locations may be disruptive for circadian rhythms, since seasonality of sunrise near the equator is negligible or very mild.