Studying 24-hour rhythms of light exposure, alignment with rest-activity cycle, and cardiometabolic health in a nationally representative sample

项目总结 昼夜节律，由内源分子时钟产生，由明暗循环所牵连，发挥着 在协调与心脏代谢健康相关的许多生理和行为过程中发挥核心作用。一个 越来越多的证据将一天中不同时间的光照暴露与心脏代谢结果联系起来， 提示24小时明暗周期特征可能是疾病风险的唯一预测因子。然而， 缺乏以全面评估24小时光照暴露为重点的调查，尤其是， 它与昼夜行为的一致性，以了解其在人类群体中的健康影响。一口井- 一个健康的昼夜节律计时系统的既定标志是同步和适当地对齐 要素，例如环境刺激(例如，明暗循环)和日常行为(例如，活动-- 休息周期)。我们在老年男性中的初步研究应用相量分析来评估动作图- 测量了24小时的日光-黑暗和活动-休息周期，我们发现两者之间的一致性受损 与糖尿病有关。这些发现表明，光暴露的时间不同步 活动模式可能是心脏代谢风险的唯一预测因子，这是一个需要 在更广泛的人群中进行了测试。我们建议通过进行二次数据分析来检验这一假设 全国健康和营养检查调查(NHANES，2011-2014)，其中有24小时的详细数据 光线和活动模式以及有关心脏代谢健康的丰富信息。此外，多元化和全国性的 有代表性的样本将使我们能够确定24小时光照模式，它与 活动-休息周期及其与心脏代谢结果的相关性在患有以下疾病的亚组中可能不同 不同的人口统计、社会经济和职业特征。目的1研究24-6岁儿童的特征。 小时光暴露及其与休息和活动模式的一致性与心脏代谢健康的关系 在NHANES的成年参与者中。在这个目标中，我们将应用参数和非参数方法来 表征明暗循环和相量分析的多个方面，以表征 光-暗和活动-休息周期，以研究它们与心脏代谢结果的关系。目标2书房灯光 成人暴露、与休息和活动的一致性及其与心脏代谢健康的关系 具有不同人口、社会经济和职业属性的人口。为了实现这一目标，我们将 考察作为24小时明暗周期决定因素的多种种群属性及其与活动的一致性- 休息周期，并作为光暴露与心脏代谢健康之间关系的调节剂。灯 暴露是心脏代谢性疾病的一个潜在的可改变的危险因素，我们的研究将有助于更好地 了解光照对心脏代谢健康和疾病差异的贡献，并提供 制定预防和治疗干预措施的证据，目的是控制光暴露和 活动-休息模式，以改善昼夜节律功能和心脏代谢健康。

PROJECT SUMMARY Circadian rhythms, generated by endogenous molecular clocks and entrained by the light-dark cycle, play a central role in orchestrating many physiological and behavioral processes related to cardiometabolic health. A growing body of evidence has linked light exposure at different times of the day and cardiometabolic outcomes, suggesting that characteristics of 24-hour light-dark cycle may be unique predictors of disease risk. However, there is a lack of investigation focusing on comprehensively assessing 24-hour light exposure, and in particular, its alignment with diurnal behavioral, to understand its health implications in human populations. A well- established hallmark of a healthy circadian timing system is the synchronization and proper alignment of multiple elements, such as between the environmental stimuli (e.g., light-dark cycle) and diurnal behaviors (e.g., activity- rest cycle). Our pilot study in older men applied phasor analysis to assess the alighnment between actigraphy- measured 24-hour light-dark and activity-rest cycles, and we found that impaired alignment between the two was associated with diabetes. These findings suggest that poor synchronization between the timing of light exposure and activity patterns may be a unique predictor of cardiometabolic risk, a novel hypothesis that needs to be tested in broader populations. We propose to test this hypothesis by conducting secondary data analysis in the National Health and Nutrition Examination Survey (NHANES, 2011-2014), which has detailed data on 24-hour light and activity patterns and rich information on cardiometabolic health. Moreover, the diverse and nationally representative sample will allow us to determine how 24-hour patterns of light exposure, its interrelationship with activity-rest cycles, and their associations with cardiometabolic outcomes may vary among subgroups with different demographic, socioeconomic, and occupational characteristics. Aim 1 Study characteristics of 24- hour light exposure and its alignment with rest and activity patterns in relation to cardiometabolic health in adult participants in NHANES. In this aim we will apply parametric and nonparametric methods to characterize multiple aspects of light-dark cycles and phasor analysis to characterize the alignment between light-dark and activity-rest cycles to study their associations with cardiometabolic outcomes. Aim 2 Study light exposure, alignment with rest and activity, and their associations with cardiometabolic health in adult populations with different demographic, socioeconomic and occupational attributes. In this aim we will examine multiple population attributes as determinants of 24-hour light-dark cycles and its alignment with activity- rest cycles, and as moderators of the association between light exposure and cardiometabolic health. Light exposure is a potentially modifiable risk factor for cardiometabolic diseases, and our study will help better understand the contribution of light exposure to cardiometabolic health and disease disparities, and provide evidence for developing preventive and therapeutic interventions aimed at manipulating light exposure and activity-rest patterns to improve circadian function and cardiometabolic health.