Study on bone mineral density level and its influencing factors in obese school-age children

ZHANG Jin; ZHANG Tian; SUN Hui-hui; SHANG Ran; SHI Wei-jia; DENG Yu-kun; HE Yue-hui; WAN Nai-jun

doi:10.11852/zgetbjzz2020-0452

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Chinese Journal of Child Health Care ›› 2020, Vol. 28 ›› Issue (11) : 1271-1275. DOI: 10.11852/zgetbjzz2020-0452

Study on bone mineral density level and its influencing factors in obese school-age children

ZHANG Jin¹, ZHANG Tian¹, SUN Hui-hui¹, SHANG Ran¹, SHI Wei-jia¹, DENG Yu-kun², HE Yue-hui³, WAN Nai-jun¹

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Abstract

Objective To investigate changes and influencing factors of bone mineral density (BMD) in school-aged children with obesity. Methods A total of 96 school-age children (aged 6 to12 years) who visited the pediatric department of Beijing Jishuitan Hospital from October 2018 to October 2019, were enrolled in this study to complete a questionnaire survey.A series of physical examination were performed for these participants, including body composition, BMD of both distal ulnar and radius, abdominal ultrasound, blood level of lipids, calcium, vitamin D and fasting insulin.SPSS 25.0 software was used for statistical analysis. Results The average age of 96 children was (9.10±1.88) years old.There was no significant difference on BMD between left and right distal ulnar and radius, or between boys and girls (P>0.05).BMD of 10- to 12-year-old children was significantly higher than that in children aged 6-7 years and 8-9 years(H=13.917,P＜0.05).Age and muscle mass were both positively correlated with BMD of obese school-age children (r=0.359, 0.315, P<0.05), while the levels of total cholesterol, triglyceride, low density lipoprotein-cholesterol and calcium were negatively related to BMD (r=-0.311, -0.203, -0.246, -0.207, P<0.05).Milk and dairy products, carbonated beverage, moderate exercise, sunlight exposure and sedentary time were found to be influencing factors of BMD (P<0.05).Multiple linear regression analysis showed that sunlight exposure time was an independent factor affecting BMD(β=0.036, t=2.836, P< 0.05). Conclusion BMD increases with age for obese school-aged children.Dietary and environmental factors are important contributors to ensure the healthy growth of BMD.

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obesity / school-age children / bone mineral density

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ZHANG Jin, ZHANG Tian, SUN Hui-hui, SHANG Ran, SHI Wei-jia, DENG Yu-kun, HE Yue-hui, WAN Nai-jun. Study on bone mineral density level and its influencing factors in obese school-age children[J]. Chinese Journal of Child Health Care. 2020, 28(11): 1271-1275 https://doi.org/10.11852/zgetbjzz2020-0452

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