title: Sedentary Behavior Is Independently Related to Fat Mass among Children and Adolescents in South China.
abstract: We aim to explore the independent associations of sedentary behaviors (SB) with body mass distribution among Chinese children. Data on the screen-based sedentary time (television viewing and computer use) and doing homework, physical activities and dietary intake of 1586 Chinese children (50.3% girls) aged 7-15 years were obtained through validated questionnaires. Skin-fold thickness, body height, and weight were measured to calculate percent body fat (%BF), fat mass index (FMI), and fat-free mass index (FFMI). Parental characteristics were collected by questionnaires. Among girls, time of SB (screen time or doing homework) was positively related to %BF, FMI, and FFMI (p< 0.03) after adjusting for maternal overweight, the average annual income of family, moderate-to-vigorous physical activity energy expenditure, and energy intake: Girls in the highest tertile of screen time/homework had 16.7%/23.3% higher relative FMI and 2.9%/2.9% higher relative FFMI than girls in the lowest tertile. Among boys, screen time was positively associated with FFMI (p< 0.003), but not related to %BF and FMI (p> 0.09), while time of doing homework was positively related to %BF and FMI (p= 0.03). Sedentary behaviors might be positively and independently related to fat mass among Chinese children, and were more pronounced in girls.
authors: Department of Nutrition, Food Safety and Toxicology, West China School of Public Health, Sichuan University, Chengdu 610041, China. xhmei_1109@163.com.
authors: Hongmei
authors: H
authors: Xue
authors: Department of Nutrition, Food Safety and Toxicology, West China School of Public Health, Sichuan University, Chengdu 610041, China. tg_723@126.com.
authors: Guo
authors: G
authors: Tian
authors: Department of Clinical Nutrition, Jincheng People's Hospital, Jincheng 048026, China. duanrn121@163.com.
authors: Ruonan
authors: R
authors: Duan
authors: Office of Scientific Research Management, West China School of Public Health, Sichuan University, Chengdu 610041, China. quanlm2002@126.com.
authors: Liming
authors: L
authors: Quan
authors: West China Research Center for Rural Health Development, Sichuan University Huaxi Medical Center, Chengdu 610041, China. zhaoli@scu.edu.cn.
authors: Li
authors: L
authors: Zhao
authors: West China Research Center for Rural Health Development, Sichuan University Huaxi Medical Center, Chengdu 610041, China. yangmin2013@scu.edu.cn.
authors: Min
authors: M
authors: Yang
authors: Department of Child and Adolescent Psychiatry, University Hospital Essen, University of Duisburg-Essen, Essen, Duisburg 47057, Germany. Lars.Libuda@uni-due.de.|Department of Pediatrics, Research Institute for the Prevention of Allergies and Respiratory Diseases in Childhood, Marien-Hospital Wesel, Wesel 46483, Germany. Lars.Libuda@uni-due.de.
authors: Lars
authors: L
authors: Libuda
authors: Berlin School of Public Health, Charité-Universitätsmedizin, Berlin 10117, Germany. rebecca.muckelbauer@charite.de.
authors: Rebecca
authors: R
authors: Muckelbauer
authors: Department of Nutrition, Food Safety and Toxicology, West China School of Public Health, Sichuan University, Chengdu 610041, China. gcheng@scu.edu.cn.
authors: Guo
authors: G
authors: Cheng
mesh_terms: D050154:Adiposity / Q000208:ethnology; D000293:Adolescent; D000294:Adolescent Behavior / Q000208:ethnology; D015992:Body Mass Index; D002648:Child; D002652:Child Behavior / Q000208:ethnology; D002681:China / Q000453:epidemiology; D016000:Cluster Analysis; D003430:Cross-Sectional Studies; D005192:Family Health / Q000208:ethnology; D005260:Female; D006801:Humans; D008297:Male; D050177:Overweight / Q000453:epidemiology / Q000208:ethnology / Q000209:etiology*; D063766:Pediatric Obesity / Q000453:epidemiology / Q000208:ethnology / Q000209:etiology*; D015995:Prevalence; D012574:Schools; D057185:Sedentary Behavior / Q000208:ethnology; D057566:Self Report; D012737:Sex Factors; D012885:Skinfold Thickness; D013997:Time Factors
keywords: body fat; energy intake; physical activity; sedentary time