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Abstract：
Little is known about the longitudinal association of familial socio-demographic factors, behaviours, attitudes, or home environment with meeting physical activity guidelines. Our objective was to a) describe 4-year change in the prevalence of meeting guidelines, and characteristics of participants across categories of physical activity maintenance, and b) identify familial factors in childhood that are longitudinally associated with meeting guidelines in adolescence. Data on 17 parent- and child-reported family variables and objectively measured physical activity (ActiGraph GT1M) were available from 406 children (10.3 ± 0.3 years, 53.5% female) participating in the SPEEDY study. Average duration of week- and weekend day moderate-to-vigorous physical activity (MVPA, ≥ 2000 cpm) at baseline and follow-up (14.3 ± 0.3 years) were calculated to determine whether participants met 60 min MVPA/day guidelines at each assessment. Descriptives were calculated across four MVPA change categories. Multi-level logistic regression examined the association of baseline familial factors with meeting guidelines at follow-up, adjusting for sex, baseline physical activity, family socio-economic position, and school clustering. At follow-up, 51.5% and 36.1% of adolescents met guidelines on weekdays and weekend days, respectively (baseline: 68.0%, 67.2%). Girls were less likely than boys to remain sufficiently active, particularly on weekdays. Family social support was positively associated with adolescents meeting guidelines at weekends (OR 1.2; 95% CI 1.0-1.4). The presence of play equipment at home was negatively associated with meeting guidelines on weekdays (OR 0.5; 95% CI 0.3-0.8). Interventions that foster parent\'s facilitation of physical activity may help to encourage the upkeep of healthy behaviours during the transition from childhood to adolescence.
摘要：
对家族社会人口因素的纵向关联知之甚少，行为,态度，或家庭环境符合体育活动指南。我们的目标是a)描述会议指南流行率的4年变化，以及不同类别的身体活动维护参与者的特征，和b）确定与青春期满足指南纵向相关的儿童期家族因素。从406名儿童（10.3±0.3岁，53.5%女性）参与SPEEDY研究。每周和周末中等至剧烈体力活动的平均持续时间(MVPA，计算基线和随访（14.3±0.3年）时≥2000cpm），以确定参与者在每次评估中是否符合60分钟MVPA/天指南。在四个MVPA变化类别中计算描述性。多水平logistic回归检查了基线家族因素与随访时符合指南的关系，适应性，基线体力活动，家庭社会经济地位,和学校集群。在后续行动中,分别有51.5%和36.1%的青少年在工作日和周末符合准则,分别(基线：68.0%，67.2%）。女孩比男孩更不可能保持足够的活跃，特别是在工作日。家庭社会支持与周末满足指南的青少年呈正相关（OR1.2；95％CI1.0-1.4）。在家玩耍设备的存在与工作日的会议指南呈负相关（OR0.5；95％CI0.3-0.8）。促进父母促进身体活动的干预措施可能有助于鼓励从童年到青春期的健康行为。
