The worldwide prevalence of insufficient physical activity (PA) and prolonged sedentary behavior (SB) were high before the coronavirus (COVID-19) pandemic. Measures that were taken by governments (such as home confinement) to control the spread of COVID-19 may have affected levels of PA and SB. This cross-sectional study among South American adults during the first months of COVID-19 aims to (i) compare sitting time (ST), screen exposure, moderate PA (MPA), vigorous PA (VPA), and moderate-to-vigorous PA (MVPA) before and during lockdown to sociodemographic correlates and (ii) to assess the impact of lockdown on combinations of groups reporting meeting/not-meeting PA recommendations and engaging/not-engaging excessive ST (≥7 h/day). Bivariate associations, effect sizes, and multivariable linear regressions were used. Adults from Argentina (n = 575) and Chile (n = 730) completed an online survey with questions regarding demographics, lifestyle factors, and chronic diseases. Mean reductions of 42.7 and 22.0 min./day were shown in MPA and VPA, respectively; while increases of 212.4 and 164.3 min./day were observed in screen and ST, respectively. Those who met PA recommendations and spent <7 h/day of ST experienced greatest changes, reporting greater than 3 h/day higher ST and more than 1.5 h/day lower MVPA. Findings from the present study suggest that efforts to promote PA to South American adults during and after COVID-19 restrictions are needed.

中文翻译：

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南美成年人Covid-19锁定期间坐着时间，屏幕曝光和体育锻炼的变化：跨部门研究

在冠状病毒（COVID-19）大流行之前，全世界缺乏足够的体育活动（PA）和久坐的行为（SB）的流行率很高。政府为控制COVID-19的传播采取的措施（例如家庭隔离）可能会影响PA和SB的水平。这项在COVID-19的头几个月中进行的南美成年人横断面研究旨在（i）比较就座时间（ST），屏幕暴露，中度PA（MPA），剧烈PA（VPA）和中度至剧烈在锁定与社会人口统计学相关因素之前和之中的PA（MVPA），以及（ii）评估锁定对报告会议/未满足PA建议和参与/不参与过多ST（≥7 h /天）的人群组合的影响。使用双变量关联，效应量和多变量线性回归。来自阿根廷的成年人（n = 575）和智利（n = 730）完成了有关人口统计，生活方式因素和慢性病的在线调查。MPA和VPA分别显示每天平均减少42.7和22.0分钟。而筛查和ST则分别增加212.4和164.3分钟/天。那些满足PA建议且每天ST花费少于7小时的人经历了最大的变化，他们报告的ST升高超过3小时/天，MVPA降低超过1.5小时/天。从本研究中发现，在COVID-19限制期间和之后，需要努力向南美成年人推广PA。