BMI from 3-6 y of age is predicted by TV viewing and physical activity, not diet
BMI from 3-6 y of age is predicted by TV viewing and physical activity, not diet
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DOI：
10.1038/sj.ijo.0802969
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发表时间：
2005-06-01
影响因子：
4.9
通讯作者：
Greaves, KA
中科院分区：
文献类型：
--
作者：
Jago, R;Baranowski, T;Greaves, KA
目的：为了研究饮食、体力活动、久坐行为或看电视是否能预测3-7岁儿童的体重指数（BMI），设计：从1986年至1989年对3-4岁儿童的三种族队列进行为期3年的随访。心率监测和观察用于评估体力活动。每年通过直接观察评估饮食（卡路里、脂肪和碳水化合物的卡路里百分比）、久坐行为和看电视情况。以年份为因子，以每年年底的BMI为因变量进行重复测量回归分析。结果：每小时看电视的分钟数与研究年限、每小时体力活动的分钟数与研究年限之间的交互作用有显著性（P < 0.05）。从研究开始，看电视、体育活动和BMI也有显著的主效应。该模型解释了三年研究期间BMI变化的65%。绘制显着的相互作用表明，体力活动与BMI在第1年呈正相关，在第2年和第3年呈负相关，第3年的负相关性比第2年更强。看电视成为正相关与BMI在第三个studyear.CONCLUSION：体育活动和看电视是唯一显着的预测因子（基线BMI以外）的BMI在一个三种族队列的3-4岁的儿童，随后为3年的体育活动（负相关）和看电视（正相关）成为更强的预测因子作为儿童年龄。6岁或7岁似乎是看电视和体育活动可能影响BMI的关键年龄。因此，减少看电视的时间，增加体育活动的时间可能是预防这个年龄组肥胖的成功方法。国际肥胖杂志（2005）。
OBJECTIVE: To investigate whether, diet, physical activity, sedentary behavior or television ( TV) viewing predicted body mass index (BMI) among 3-7-y-old children.DESIGN: A triethnic cohort of 3-4-y-old children was followed for 3 y from 1986 to 1989.MEASUREMENTS: BMI was assessed at the beginning and end of each measurement year. Heart rate monitoring and observation were used to assess physical activity. Diet ( calories, % calories from fat and carbohydrate), sedentary behavior and TV viewing were assessed by direct observation in each year. A repeated measures regression analysis with year as a factor and BMI at the end of each year as dependent variables was run. Nonsignificant variables were removed in a stepwise backward deletion process and significant interactions graphed.RESULTS: The interactions between minutes of TV viewing per hour and study year and minutes of physical activity per hour and study year were significant (P < 0.05). There were also significant main effects for TV viewing, physical activity and BMI from the beginning of the study. The model accounted for 65% of the variance in BMI across the three study years. Plotting the significant interactions demonstrated that physical activity was positively associated with BMI in year 1, and negatively associated in years 2 and 3 with a stronger negative relationship in year 3 than 2. TV viewing became positively associated with BMI during the third study year.CONCLUSION: Physical activity and TV viewing were the only significant predictors ( other than baseline BMI) of BMI among a triethnic cohort of 3-4-y-old children followed for 3 y with both physical activity ( negatively associated) and TV viewing ( positively associated) becoming stronger predictors as the children aged. It appears that 6 or 7 y is a critical age when TV viewing and physical activity may affect BMI. Therefore, focusing on reducing time spent watching television and increasing time spent in physical activity may be successful means of preventing obesity among this age group. International Journal of Obesity (2005).