The Canadian 24-h movement guidelines have led to an increased focus on movement behaviours (sleep, screen, sedentary, and physical activity) throughout the day. We examined the cross-sectional and longitudinal associations between 24-h movement behaviours and parent-reported levels of internalizing, externalizing, and total behaviour problems in a subset of the CHILD birth cohort study at ages 3 (N Age 3 = 541, 48.1% girls) through 5 (N Age 5 = 575, 49.6% girls). Physical activity, sedentary time, and sleep were measured using an accelerometer worn on the non-dominant wrist for seven days following a 24-h protocol. Screen time was measured via parent-report and date-matched to daily accelerometer recordings. Compositional isotemporal substitution models predicted change in behaviour problems with reallocating time between movement behaviours. Cross-sectional analysis indicated that screen time relative to other movement behaviours was associated with greater externalizing behaviours at age 3 and greater internalizing and total problem behaviours at ages 3 and 5. This was supported in the longitudinal analysis, where increased screen time at 3 was associated with increased internalizing, externalizing, and total problem behaviours at 5. Cross-sectional reallocation from screen to non-screen sedentary time was associated with reductions in internalizing and total behaviour problems at 3 and 5 years and reductions in externalizing at 3. Contrary to previous findings, cross-sectional proportional increases in moderate-to-vigorous-intensity physical activity were associated with increased externalizing and total problem behaviours at 5. Clinicians should prioritize supporting families to find a balanced approach rather than promoting specific movement behaviours.

中文翻译：

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找到平衡：运动行为对儿童行为问题的影响

加拿大 24 小时运动指南让人们更加关注全天的运动行为（睡眠、屏幕、久坐和体力活动）。我们在 3 岁儿童出生队列研究的一个子集中检查了 24 小时运动行为与家长报告的内化、外化和总体行为问题水平之间的横断面和纵向关联（N 年龄 3 = 541，48.1%女孩）到 5 岁（N 岁年龄 = 575，49.6% 是女孩）。按照 24 小时方案，使用戴在非惯用手手腕上的加速度计测量 7 天的体力活动、久坐时间和睡眠。屏幕时间是通过家长报告测量的，并与每日加速度计记录进行日期匹配。成分等时替代模型通过重新分配运动行为之间的时间来预测行为问题的变化。横断面分析表明，相对于其他运动行为，屏幕时间与 3 岁时更大的外化行为以及 3 岁和 5 岁时更大的内化和总体问题行为相关。纵向分析支持了这一点，其中 3 岁时增加的屏幕时间与与 5 岁时内化、外化和总体问题行为的增加相关。从屏幕到非屏幕久坐时间的横截面重新分配与 3 和 5 岁时内化和总体行为问题的减少以及 3 岁时外化的减少相关。之前的研究结果显示，5岁时，中等至剧烈强度身体活动的横截面比例增加与外化和总体问题行为的增加有关。临床医生应优先支持家庭找到平衡的方法，而不是促进特定的运动行为。