Timperio Anna, Salmon Jo, Ball Kylie, Baur Louise A, Telford Amanda, Jackson Michelle, Salmon Louisa, Crawford David
Centre for Physical Activity and Nutrition Research, Deakin University, Burwood, Australia.
Int J Pediatr Obes. 2008;3(3):160-7. doi: 10.1080/17477160801970385.
To examine associations between family physical activity and sedentary environment and changes in body mass index (BMI) z-scores among 10-12-year-old children over three years.
Design. Longitudinal (three-year follow-up). Subjects. In total, 152 boys and 192 girls aged 10-12 years at baseline.
Measured height and weight at baseline and follow-up (weight status, BMI z-scores); aspects of the family physical activity and sedentary environment (parental and sibling modelling, reinforcement, social support, family-related barriers, rules/restrictions, home physical environment) measured with a questionnaire completed by parents at baseline.
At baseline, 29.6% of boys and 21.9% of girls were overweight or obese, and mean (standard deviation, SD) BMI z-scores were 0.44 (0.99) and 0.28 (0.89), respectively. There was a significant change in BMI z-score among girls (mean change = 0.19, SD = 0.55, p < 0.001), but not boys. Among boys, the number of items at home able to be used for sedentary behaviour (B = 0.11, p = 0.037) was associated with relatively greater increases in BMI z-score. Among girls, sibling engagement in physical activity at least three times/wk (B = -0.17, p = 0.010) and the number of physical activity equipment items at home (B = -0.05, p = 0.018) were associated with relatively greater decreases in BMI z-score.
Sibling physical activity and environmental stimuli for sedentary behaviours and physical activity within the home may be important targets for prevention of weight gain during the transition from childhood to adolescence.
研究10至12岁儿童家庭体育活动和久坐环境与三年间体重指数（BMI）z评分变化之间的关联。
设计。纵向研究（三年随访）。研究对象。共有152名男孩和192名女孩，基线年龄为10至12岁。
在基线和随访时测量身高和体重（体重状况，BMI z评分）；通过家长在基线时填写的问卷测量家庭体育活动和久坐环境的各个方面（父母和兄弟姐妹的示范、强化、社会支持、家庭相关障碍、规则/限制、家庭体育环境）。
在基线时，29.6%的男孩和21.9%的女孩超重或肥胖，平均（标准差，SD）BMI z评分分别为0.44（0.99）和0.28（0.89）。女孩的BMI z评分有显著变化（平均变化 = 0.19，SD = 0.55，p < 0.001），但男孩没有。在男孩中，家中可用于久坐行为的物品数量（B = 0.11，p = 0.037）与BMI z评分的相对较大增加有关。在女孩中，兄弟姐妹每周至少进行三次体育活动（B = -0.17，p = 0.010）和家中体育活动设备的数量（B = -0.05，p = 0.018）与BMI z评分的相对较大降低有关。
兄弟姐妹的体育活动以及家庭中久坐行为和体育活动的环境刺激可能是预防儿童向青少年过渡期间体重增加的重要目标。
