31st Jan 2024

Background: only 28.8% of preschoolers in worldwide meet World Health Organization´s recommendations for sleep time. While this low prevalence could be associated with screen time (ST), this relation between sleep duration with physical activity (PA) and sedentary behavior (SB) remains inconsistent, especially on week and weekend days. Aim: to describe preschoolers´ profiles of time accumulated in PA, SB, and ST among short and adequate sleepers’ preschoolers during week and weekend days. Methods: 148 Brazilian preschoolers (53.6±8.9 months) participated in the study (77 females). PA and SB were measured with accelerometry (Actigraph®, wGT3-X), hip protocol, during seven consecutive days. Sleep duration and ST were parent-reported in a face-to-face interview. Comparative analyses were developed to verify differences between bedtime and wake-up time, light PA (LPA), moderate PA (MPA), vigorous PA (VPA), and moderate to vigorous PA (MVPA), SB and ST of short and adequate sleepers, on weekdays and weekends. The t-test was used for unpaired samples (p<0.05). Results: on weekdays, adequate sleepers slept earlier than short sleepers (08:25:55pm vs. 09:53:20pm), and there was no difference regarding wake-up time, or on weekends. On weekdays, adequate sleepers accumulated more time in SB (3344.2±271.3min vs. 2241.5±243.8min; p<0.001, Cohen's d= -0.92), VPA ( 139.6±16min vs. 94.4±69.9min; p0.05). Conclusion: adequate sleepers go to bed earlier on weekdays. Also, they spent more time in vigorous and moderate to vigorous physical activity during the week.