Abstract

ABSTRACT A weekly actigraphy was conducted within a single month in 122 young adults, who were categorized into two groups: COVID(-): individuals without SARS-CoV-2 infection, n = 43; COVID(+), n = 79: individuals with confirmed SARS-CoV-2 infection. Physical activity, wrist temperature, sleep parameters, and light exposure were compared. Higher daytime ambient light exposure (LE), blue light exposure (BLE) and ultraviolet B light exposure (UVBE) in COVID(-) group. In a multivariate model, incorporating BLE amplitude, M10 of physical activity, age, sex, BLE amplitude remained the only significant predictor of COVID-19 status (observed power = 0.701, p = 0.013). ANOVA revealed significant interactions in LE, BLE, and UVBE between COVID-19 status and time of day (LE: F = 2.040, p = 0.0025; BLE: F = 2.426, p = 0.0002; UVBE: F = 3.096, p < 0.0001), with higher values observed during office hours differing between the two groups around 3 pm.

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