Objectives: Short sleep duration compromises adolescents' functioning across many domains, yet risk for short sleep is not evenly distributed among youth in the United States. Significant Black-White disparities in sleep duration have been observed, with Black/African American youth on average sleeping fewer minutes per night than their White/European American peers. However, not all Black adolescents have short sleep, and identification of moderators of effects, including protective and vulnerability factors in the association between race/ethnicity and sleep duration, is warranted. We examined whether engagement in physical activity attenuates the gap in sleep duration between Black and White teenagers. Method: A sample of 246 adolescents (Mage = 15.79 years; 32.9% Black, 67.1% White) reported on their physical activity and participated in 1 week of at-home actigraphic sleep assessment, which was used to derive sleep duration (minutes scored as asleep from sleep onset to wake time). Results: At higher levels of physical activity, relatively long sleep duration was observed for all youth regardless of their race/ethnicity. However, at lower levels of physical activity, an association emerged between race and sleep minutes, illustrating that youth most at risk for shorter sleep were Black adolescents with lower physical activity. Conclusions: Findings suggest that for Black adolescents, physical activity is a protective factor against short sleep duration and, conversely, low physical activity is a vulnerability factor. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

中文翻译：

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青少年睡眠时间的种族差异：身体活动作为保护因素。

目标：睡眠时间短会影响青少年在许多方面的功能，但美国青少年中短睡眠的风险并未平均分配。已经观察到黑人和白人在睡眠时长方面的显着差异，黑人/非洲裔美国青年平均每晚睡眠时间少于白人/欧洲裔美国同龄人。然而，并非所有黑人青少年的睡眠时间都很短，因此有必要确定影响的调节因素，包括种族/民族与睡眠时间之间关联的保护性和脆弱性因素。我们研究了参与体育活动是否会缩小黑人和白人青少年之间的睡眠时间差距。方法：246 名青少年样本（法师 = 15.79 岁；32.9% 黑人，67。1% 的白人）报告了他们的身体活动，并参加了 1 周的在家活动记录睡眠评估，该评估用于推算睡眠持续时间（从入睡到醒来的入睡分钟数）。结果：在较高水平的体力活动下，无论种族/民族如何，所有青年都观察到相对较长的睡眠时间。然而，在体力活动水平较低的情况下，种族和睡眠时间之间出现了关联，这表明最有可能缩短睡眠时间的是体力活动较少的黑人青少年。结论：研究结果表明，对于黑人青少年来说，体力活动是防止睡眠时间短的保护因素，相反，低体力活动是脆弱因素。（PsycInfo 数据库记录 (c) 2021 APA，保留所有权利）。