Association between obesity and blood pressure,vital capacity among children aged 7～12 years old in Weihua primary school in Zhangjiakou

【Objective】 To investigate the prevalence of overweight and obesity among children aged 7～12years old in Weihua primary school in Zhangjiakou,and analyze their relationships between obesity and blood pressure,vital capacity.【Methods】 In September 2012,1 530children aged 7～12years old were involved by a cluster sampling method in Weihua primary school in Zhangjiakou.The weight,height,blood pressure,vital capacity,and other related indexes were measured,with body mass index(BMI)being calculated.According to the BMI value,the overweight and obese children were defined.The relationships between obesity and blood pressure levels,vital capacity were also analyzed.【Results】 The total prevalence of overweight and obesity in involved children were 13.01% and 14.25%,respectively.Among boys and girls,the prevalences were 17.2%and 8.31%for overweight,while 14.23%and 8.59%for obesity,respectively.Both the prevalences of overweight and obesity in boys were significantly higher than those in girls(P0.01).The systolic blood pressure(SBP)and diastolic blood pressure(DBP)levels were higher in overweight and obese children than those in the normal weight children(P0.01).The detection rates of high blood pressure among overweight,obesity and normal children were 10.55%,39.95%and 4.85%,respectively,which had a significant difference(P0.01).When the children's BMI was less than 30,BMI was positively correlated with vital capacity,and when the children's BMI was greater than or equal to 30,BMI was negatively correlated with vital capacity.【Conclusions】 The prevalences of overweight and obesity are high among children in Weihua primary school in Zhangjiakou,and higher prevalence is found in the boys.The SBP and DBP levels of children are increasing continuously following by increasing obesity,and the prevalence of high blood pressure is also increasing from normal weight,overweight to obesity.When children's BMI is greater than or equal to 30,the obesity has already affected lung's function.Results show that overweight and obesity in childhood made the function of heart and lung reduced.Therefore,the prevention and control of obesity is imperative in childhood.