Body Fat In Children Research Articles

Comparison of BMI, triponderal mass index, and paediatric body adiposity Index for predicting body fat and screening obesity in preschool children.

Several novel anthropometric indices, including paediatric body adiposity index (BAIp) and triponderal mass index (TMI), have emerged as potential tools for estimating body fat in preschool children. However, their comparative validity and accuracy, particularly when compared to established indicators such as Body Mass Index (BMI), have not been thoroughly investigated. This cross-sectional study enrolled 2869 preschoolers aged 3-6 years in Wuhan, China. The nonparametric Bland-Altman analysis was employed to evaluate the agreement between BMI, BAIp, and TMI with percentage of body fat (PBF), determined by bioimpedance analysis (BIA), serving as the reference measure of adiposity. Additionally, Receiver Operating Characteristic Curve (ROC) analysis was conducted to assess the effectiveness of BMI, BAIp, and TMI in screening for obesity. BAIp demonstrated the least bias in estimating PBF, showing discrepancies of 3.64% (95%CI: 3.40% to 4.12%) in boys and 3.95% (95%CI: 3.79% to 4.23%) in girls. Conversely, BMI underestimated PBF by 3.89% (95%CI: 3.70% to 4.37%)in boys and 4.81% (95%CI: 4.59% to 5.09%) in girls, while TMI also underestimated PBF by 5.15% (95%CI: 4.90% to 5.52%) in boys and 5.68% (95%CI: 5.30% to 5.91%) in girls. BAIp exhibited the highest area under the curve (AUC) values (AUC=0.867-0.996) in boys, whereas in girls, there was no statistically significant difference between BMI (AUC = 0.936, 95% CI: 0.921-0.948) and BAIp(AUC = 0.901, 95% CI 0.883-0.916) in girls (P=0.054). In summary, when considering the identification of obesity, BAIp shows promise as a screening tool for both boys and girls.

Maintained cognitive gains after 10 weeks of cognitively engaging exercise via reducing body fat in overweight children

ABSTRACT This study aimed to determine whether the exercise-induced cognitive benefits persist after the interventions end and whether the persistence of cognitive gains following the intervention depends on the post-intervention exercise behaviour. Overweight children aged 10–12 years were enrolled in a 16-week afterschool program. During the first 10 weeks, children were randomised to receive the cognitively engaging movement games (CEMG) (N = 27) or the sedentary control (N = 27) interventions. During the subsequent 6-week post-intervention period, children self-selected either CEMG or sedentary activities daily. Perceptual discrimination performance, fitness, and body fat were measured before, immediately after, and 6-week after the intervention. Immediately after the intervention, the CEMG group improved aerobic capacity, muscular endurance, muscle power, body fat, and perceptual discrimination performance compared with the control group, and most of these benefits persisted after 6 weeks following the cessation of intervention. During the 6-week post-intervention period where CEMG and sedentary activities were both available, the CEMG group chose to engage in CEMG more frequently and with higher intensity on those days than the control group. The post-intervention exercise behaviours were positively related to the persistence of cognitive gains, and these associations were mediated through decreased body fat. Collectively, the 10-week CEMG intervention has positive effects not only on physical and cognitive outcomes, but also post-intervention self-selected exercise behaviours that may help maintain intervention-induced cognitive gains in overweight children. Future research controlling for factors impacting children’s behavioural choice and determining the differential effects of CEMG versus traditional exercise regimen is needed. Trial registration: Thai Clinical Trials Registry identifier: TCTR20220913006.

Percent Body Fat and Weight Status of Youth Participating in Pediatric Weight Management Programs in the Pediatric Obesity Weight Evaluation Registry.

Factors associated with change in percent body fat (%BF) of children in pediatric weight management (PWM) care may differ from those associated with change in weight status. Objective: To describe %BF and weight status at initial visits to 14 PWM sites, identify differences by sex, and evaluate factors associated with change over 6 months. Methods: Initial visits of 2496 males and 2821 females aged 5-18 years were evaluated. %BF was measured using bioelectrical impedance analysis. Results: Sex-specific logistic regressions [806 males (32.3%), 837 females (29.7%)] identified associations with primary outcomes: lower %BF and metabolically impactful ≥5-point drop in percent of the 95th BMI percentile (%BMIp95) over 6 months. At the initial visit, males had lower %BF and higher %BMIp95 than females. Over 6 months, males had significantly (p < 0.001) greater median drop in %BF (-1.4% vs. -0.4%) and %BMIp95 (-3.0% vs. -1.9%) and a higher frequency of decreased %BF (68.9% vs. 57.8%), but similar percentage with ≥5-point %BMIp95 drop (36.5% vs. 32.4%; p = 0.080). For males, factors significantly associated with decreased %BF (older age, ≥6 visits, lack of developmental or depression/anxiety concerns) were not related to having a ≥5-point %BMIp95 drop. For females, lack of depression/anxiety concern was significantly associated with decreased %BF but was not associated with ≥5-point %BMIp95 drop. Conclusions: There are differences by sex in initial visit %BF and %BMIp95 and in characteristics associated with changes in these measures. PWM interventions should consider evaluating body composition and sex-stratifying outcomes.

A school-based food and nutrition education intervention increases nutrition-related knowledge and fruit consumption among primary school children in northern Ghana

BackgroundProviding children with the opportunity to learn about nutrition is critical in helping them establish a healthy lifestyle and eating behaviours that would remain with them till adulthood. We determined the effect of a school-based food and nutrition education (SFNE) intervention on the nutrition-related knowledge, attitudes, dietary habits, physical activity levels and the anthropometric indices (BMI-for-age z scores, %Body fat and waist circumference) of school-age children in northern Ghana.MethodsFollowing a controlled before-and-after study design, we recruited school-age children in primary 4 and 5 from public and private schools and assigned them non-randomly to intervention and control groups (4 schools total). A SFNE intervention called ‘Eat Healthy, Grow Healthy (EHGH)’ was implemented in intervention schools. Components of the intervention included children, teachers, school officials, and the school environment. Nutrition education didactic sessions, active discussions, nutrition games, charades, art work, and physical activity sessions were among the teaching and learning activities implemented. At 0 and 6 months, primary (anthropometry) and secondary (fruit, vegetable, and breakfast consumption) outcomes were obtained.ResultsMean BMI-for-age z-scores did not differ significantly between intervention and control groups (F1,261 = 0.45, P = 0.503, η2 = 0.01). However, significantly greater nutrition-related knowledge scores were recorded in the intervention group than in the control group at post-intervention (M = 6.07 SD = 2.17 vs. M = 5.22 SD = 1.92; p = 0.002). Mean number of days intervention children consumed fruits differed across time (F1, 263 = 33.04, p = 0.002, η2 = 0.04) but not between the control and intervention groups (F1, 263 = 0.28, p = 0.60, η2 = 0.00).ConclusionsThe EHGH intervention had positive effects on the nutrition-related knowledge and the consumption of fruits among children although it did not impact their anthropometric indices.

BODYFAT: a new calculator to determine the risk of being overweight validated in Spanish children between 11 and 17 years of age

The assessment of body fat of children in primary care requires consideration of the dynamic changes in height, weight, lean mass, and fat mass during childhood growth. To achieve this, we aim to develop a predictive equation based on anthropometric values, with optimal diagnostic utility. This is a cross-sectional observational study, involving schoolgoers aged 11–17 years in the Vigo metropolitan area. Out of 10,747 individuals, 577 were randomly recruited. Variables: age, sex, ethnicity/country of origin, weight, height, 8 skinfolds, 3 diameters, 7 perimeters, and 85% percentile of body fat mass as the gold standard. Generalized additive regression was selected by cross-validation and compared using receiver operating characteristic curves (ROC curves). Sensitivity, specificity, positive and negative predictive values, true positive and true negative values, false positive and false negative values, accuracy, and positive and negative likelihood ratios were calculated. Two models were identified. The optimal model includes sex, weight, height, leg perimeter, and arm perimeter, with sensitivity of 0.93 (0.83–1.00), specificity of 0.91 (0.83–0.96), accuracy of 0.91 (0.84–0.96), and area under the curve (AUC) of 0.957 (0.928–0.986). The second model includes sex, age, and body mass index, with sensitivity of 0.93 (0.81–1.00), specificity of 0.90 (0.80–0.97), accuracy of 0.90 (0.82–0.96), and an AUC of 0.944 (0.903–0.984).Conclusion: Two predictive models, with the 85th percentile of fat mass as the gold standard, built with basic anthropometric measures, show very high diagnostic utility parameters. Their calculation is facilitated by a complementary online calculator.What is Known:• In routine clinical practice, mainly in primary care, BMI is used to determine overweight and obesity. This index has its weaknesses in the assessment of children.What is New:• We provide a calculator whose validated algorithm, through the determination of fat mass by impedanciometry, makes it possible to determine the risk of overweight and obesity in the community setting, through anthropometric measurements, providing a new practical, accessible and reliable model that improves the classification of overweight and obesity in children with respect to that obtained by determining BMI.

Associations of childhood BMI, general and visceral fat mass with metabolite profiles at school-age.

Childhood obesity increases metabolic disease risk. Underlying mechanisms remain unknown. We examined associations of body mass index (BMI), total body fat mass, and visceral fat mass with serum metabolites at school-age, and explored whether identified metabolites improved the identification of children at risk of a metabolically unhealthy phenotype. We performed a cross-sectional analysis among 497 children with a mean age of 9.8 (95% range 9.1, 10.6) years, participating in a population-based cohort study. We measured BMI, total body fat mass using DXA, and visceral fat mass using MRI. Serum concentrations of amino-acids, non-esterified-fatty-acids, phospholipids, and carnitines were determined using LC-MS/MS. Children were categorized as metabolically healthy or metabolically unhealthy, according to BMI, blood pressure, lipids, glucose, and insulin levels. Higher BMI and total body fat mass were associated with altered concentrations of branched-chain amino-acids, essential amino-acids, and free carnitines. Higher BMI was also associated with higher concentrations of aromatic amino-acids and alkyl-lysophosphatidylcholines (FDR-corrected p-values < 0.05). The strongest associations were present for Lyso.PC.a.C14.0 and SM.a.C32.2 (FDR-corrected p-values < 0.01). Higher visceral fat mass was only associated with higher concentrations of 6 individual metabolites, particularly Lyso.PC.a.C14.0, PC.aa.C32.1, and SM.a.C32.2. We selected 15 metabolites that improved the prediction of a metabolically unhealthy phenotype, compared to BMI only (AUC: BMI: 0.59 [95% CI 0.47,0.71], BMI + Metabolites: 0.91 [95% CI 0.85,0.97]). An adverse childhood body fat profile, characterized by higher BMI and total body fat mass, is associated with metabolic alterations, particularly in amino acids, phospholipids, and carnitines. Fewer associations were present for visceral fat mass. We identified a metabolite profile that improved the identification of impaired cardiometabolic health in children, compared to BMI only.

Phthalate and phthalate replacement concentrations in relationship to adiposity in a multi-racial cohort of children

Background/ObjectivePhthalates and phthalate replacements are used in multiple everyday products, making many of them bioavailable to children. Experimental studies suggest that phthalates and their replacements may be obesogenic, however, epidemiologic studies remain inconsistent. Therefore, our objective was to examine the association between phthalates, phthalate replacements and childhood adiposity/obesity markers in children.Subjects/MethodsA cross-sectional study was conducted in 630 racial/ethnically diverse children ages 4–8 years. Urinary oxidative metabolites of DINCH and DEHTP, three low molecular weight (LMW) phthalates, and eleven high molecular weight (HMW) phthalates were measured. Weight, height, waist circumference and % body fat were measured. Composite molar sum groups (nmol/ml) were natural log-transformed. Linear regression models adjusted for urine specific gravity, sex, age, race-ethnicity, birthweight, breastfeeding, reported activity level, mother’s education and pre-pregnancy BMI.ResultsAll children had LMW and HMW phthalate metabolites and 88% had DINCH levels above the limit of detection. One unit higher in the log of DINCH was associated with 0.106 units lower BMI z-score [β = −0.106 (95% CI: −0.181, −0.031)], 0.119 units lower waist circumference z-score [β = −0.119 (95% CI: −0.189, −0.050)], and 0.012 units lower percent body fat [β = −0.012 (95% CI: −0.019, −0.005)]. LMW and HMW group values were not associated with adiposity/obesity.ConclusionsWe report an inverse association between child urinary DINCH levels, a non-phthalate plasticizer that has replaced DEHP in several applications, and BMI z-score, waist circumference z-score and % body fat in children. Few prior studies of phthalates and their replacements in children have been conducted in diverse populations. Moreover, DINCH has not received a great deal of attention or regulation, but it is a common exposure. In summary, understanding the ubiquitous nature of these chemical exposures and ultimately their sources will contribute to our understanding of their relationship with obesity.

Beyond Obesity and Overweight: The Clinical Assessment and Treatment of Excess Body Fat in Children : Part 1 - Insulin Resistance as the Root Cause of Pediatric Obesity.

Pediatric obesity and comorbidities related to insulin resistance continue to be a growing public health crisis. If lifestyle measures are unsuccessful, pharmacological and surgical interventions are offered. In this paper, we describe the driving force of the obesity crisis: hyperinsulinemia and the development of insulin resistance. We give historical background of key policy issues which have contributed to this pandemic as well as the physiologic mechanisms of insulin resistance. The prevalence of obesity will continue to rise unless the root cause of hyperinsulinemia is addressed. Current research on insulin resistance demonstrates that a decreased consumption of carbohydrates is an effective first-line dietary intervention for the treatment of obesity and related metabolic diseases. Evidence shows it is safe and beneficial. A low-carbohydrate eating pattern can be helpful to address pediatric obesity. However, there must be policy guardrails in place to ensure that this is a sustainable and viable option for children and their families. There must be a change in the nutritional environment to help individuals battle the chronic disease of obesity.

Beyond Obesity and Overweight: the Clinical Assessment and Treatment of Excess Body Fat In Children : Part 2 - the Prescription of Low-Carbohydrate Eating as the First Approach.

Pediatric obesity and comorbidities related to insulin resistance continue to be a growing public health crisis. If lifestyle measures are unsuccessful, pharmacological and surgical interventions are offered. In this paper, we describe the driving force of the obesity crisis: hyperinsulinemia and the development of insulin resistance. We give historical background of key policy issues which have contributed to this pandemic as well as the physiologic mechanisms of insulin resistance. The prevalence of obesity will continue to rise unless the root cause of hyperinsulinemia is addressed. Current research on insulin resistance demonstrates that a decreased consumption of carbohydrates is an effective first-line dietary intervention for the treatment of obesity and related metabolic diseases. Evidence shows it is safe and beneficial. A low-carbohydrate eating pattern can be helpful to address pediatric obesity. However, there must be policy guardrails in place to ensure that this is a sustainable and viable option for children and their families. There must be a change in the nutritional environment to help individuals battle the chronic disease of obesity.

Cytokine Response to Resistance Exercise in Children with Excess Fat and Prader-Willi Syndrome

Background: Tumor necrosis factor alpha (TNF-α) is a proinflammatory cytokine that is secreted from adipose tissue and macrophages; interleukin-6 (IL-6), secreted from adipose tissue, macrophages and skeletal muscle, has both proinflammatory and anti-inflammatory properties. Previous research showed excess adiposity leads to an increased concentration of both cytokines at rest while there is limited research on resistance exercise. Purpose: To compare IL-6 and TNF-α responses to resistance exercise in children with Prader-Willi Syndrome (PWS), a genetic cause for obesity, vs. children with normal fat mass (lean), or excess body fat (obesity) Methods: Nine children with PWS (11.4 ± 3.3 years, 45.6 ± 5.2% body fat), 11 lean children (9.2 ± 1.4 years, 18.6 ± 5.0% bodyfat), and 12 children with obesity (9.6 ± 1.3 years, 40.4 ± 5.4% body fat) participated. Children stepped onto an elevated platform wearing a weighted vest for 6 sets of 10 repetitions per leg (sets separated by 1 min of rest). Children with PWS, stepped to a platform height of 23.0 cm and wore a vest load that was computed as (20% of stature* 50% of lean body mass)/23.0 cm. For the controls, the platform height was 20% of the stature and the vest load was 50% of the lean body mass. Blood samples were obtained before (pre), immediately after (post), and during recovery from exercise (+15 and +60 min). Areas under the curve (AUC) were computed for IL-6 and TNF-α. Results: There was no group by time interaction for IL-6 ( p=0.378) but a group effect ( p=0.011) and a time effect ( p&lt;0.001). Pairwise comparisons showed 60+ (1.065 ± 0.10 pg/mL) was higher than pre (0.660 ± 0.05 pg/mL), post (0.728 ± 0.06 pg/mL), and +15 (0.764 ± 0.066 pg/mL), p&lt;0.001 for all. Children with PWS and children with obesity had higher IL-6 concentrations than lean children (0.943 ± 0.12 pg/mL and 0.951 ± 0.10 pg/mL vs. 0.519 ± 0.11 pg/mL, p≤0.038 for both). For TNF-α, there were no group by time interaction, time or group effects ( p≥0.420 for all). IL-6 AUC ( p=0.013) but not TNF-α AUC ( p=0.404) were different between groups. Children with PWS and children with obesity showed a higher IL-6 AUC than lean children (85.106 ± 41.81 pg/mL, 86.796 ± 33.60 pg/mL vs. 47.611 ± 21.00 pg/mL, p≤ 0.041 for both). Conclusion: There were no differences in IL-6 or TNF-α responses to exercise based on having PWS or having excess body fat in children. However, excess body fat was associated with higher IL-6 concentration and AUC. Peak concentrations for IL-6 were observed at 60 minutes after exercise similar to other studies. Potentially, IL-6 concentrations immediately post-exercise were not elevated because the exercise protocol was not of high intensity or long enough. Study funded by the US Army Medical Research and Material Command Contract W81XWH-08-1-0025 (DAR). This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

Associations of Early-Life and Adult Anthropometric Measures with the Expression of Stem Cell Markers CD44, CD24, and ALDH1A1 in Women with Benign Breast Biopsies.

According to the stem cell hypothesis, breast carcinogenesis may be related to the breast stem cell pool size. However, little is known about associations of breast cancer risk factors, such as anthropometric measures, with the expression of stem cell markers in noncancerous breast tissue. The analysis included 414 women with biopsy-confirmed benign breast disease in the Nurses' Health Study and Nurses' Health Study II. Birthweight, weight at age 18, current weight, and current height were reported via self-administered questionnaires. IHC staining of stem cell markers (CD44, CD24, and aldehyde dehydrogenase family 1 member A1) in histopathologically normal epithelial and stromal breast tissue was quantified using an automated computational image analysis system. Linear regression was used to examine the associations of early-life and adult anthropometric measures with log-transformed stem cell marker expression, adjusting for potential confounders. Birthweight [≥10.0 vs. <5.5 lbs: β (95% confidence interval) = 4.29 (1.02, 7.56); P trend = 0.001 in the stroma] and adult height [≥67.0 vs. <63.0 inch: 0.86 (0.14, 1.58); P trend = 0.02 in the epithelium and stroma combined] were positively associated with CD44 expression. Childhood body fatness was inversely associated (P trend = 0.03) whereas adult height was positively associated with CD24 expression in combined stroma and epithelium (P trend = 0.03). Our data suggest that anthropometric measures, such as birthweight, adult height, and childhood body fatness, may be associated with the stem cell expression among women with benign breast disease. Anthropometric measures, such as birthweight, height, and childhood body fatness, may have long-term impacts on stem cell population in the breast.

Obesity contagion among classmates: Children's relation with each other regarding weight status, physical activity, and dietary intake

A series of influential articles suggests that obesity may spread between couples, siblings, and close friends via an obesity contagion phenomenon. Classmates, as important structural equivalents in one's social network, may experience obesity contagion. However, this has rarely been examined. Anthropometric measurements, questionnaire surveys, and geographic information were collected from 3670 children from 26 schools in Northeast China. We found that classmates were positively related in terms of body mass index (BMI), body fat, physical activity, and intake of vegetables, fruits, fast food, snacks, and sugar-sweetened beverages. One standard deviation (SD) increase in classmates' mean BMI and percentage body fat was associated with 0.19 SD higher individual BMI (95% confidence interval [CI]: 0.00, 0.39) and 0.31 SD higher percentage body fat (95% CI: 0.13, 0.48). Coefficients ranged from 0.48 to 0.76 in models for physical activity, and the dietary intake of vegetables, fruit, fast food, snacks, and sugar-sweetened beverages. Children's BMI and body fat were more strongly associated with the maximum and minimum body fat levels of their same-sex classmates than with those of their general classmates. Their dietary intake and physical activity were more strongly associated with the mean/median levels of their general classmates than with those of their same-sex classmates. This study suggests that children's BMI, body fat, physical activity, and dietary intake may be related to those of their classmates. Modeling healthy behaviors in the classroom may help children develop habits that support achieving and maintaining a healthy weight. Future interventions should consider the inclusion of classmates as a social network strategy for obesity prevention.

Development and Validation of a Simple Equation to Fat Mass and Percentage of Body Fat in Children and Adolescents

Development and Validation of a Simple Equation to Fat Mass and Percentage of Body Fat in Children and Adolescents

EDC mixtures during pregnancy and body fat at 7 years of age in a Swedish cohort, the SELMA study

BackgroundSome endocrine disrupting chemicals (EDC), are “obesogens” and have been associated with overweight and obesity in children. Daily exposure to different classes of EDCs demands for research with mixtures approach. ObjectivesThis study evaluates the association, considering sex-specific effects, between prenatal exposure to EDC mixture and children's body fat at seven years of age. MethodsA total of 26 EDCs were assessed in prenatal urine and serum samples from first trimester in pregnancy from 737 mother-child pairs participating in the Swedish Environmental Longitudinal, Mother and child, Asthma and allergy (SELMA) study. An indicator for children's “overall body fat” was calculated, using principal component analysis (PCA), based on BMI, percent body fat, waist, and skinfolds measured at seven years of age. Weighted quantile sum (WQS) regression was used to assess associations between EDC mixture and children's body fat. ResultsPrincipal component (PC1) represented 83.6 % of the variance, suitable as indicator for children's “overall body fat”, with positive loadings of 0.40–0.42 for each body fat measure. A significant interaction term, WQS*sex, confirmed associations in the opposite direction for boys and girls. Higher prenatal exposure to EDC mixture was borderline significant with more “overall body fat” for boys (Mean β = 0.20; 95 % CI: −0.13, 0.53) and less for girls (Mean β = −0.23; 95 % CI: −0.58, 0.13). Also, higher prenatal exposure to EDC mixture was borderline significant with more percent body fat (standardized score) for boys (Mean β = 0.09; 95 % CI: −0.04, 0.21) and less for girls (Mean β = −0.10 (−0.26, 0.05). The chemicals of concern included bisphenols, phthalates, PFAS, PAH, and pesticides with different patterns for boys and girls. DiscussionBorderline significant associations were found between prenatal exposure to a mixture of EDCs and children's body fat. The associations in opposite directions suggests that prenatal exposure to EDCs may present sex-specific effects on children's body fat.

Relationships between physical behaviour phenotypes of mothers in pregnancy and their offspring with child body composition.

The aim of this study was to identify physical behaviour phenotypes in mothers in the first trimester and in their offspring at 24 months of age. The secondary aim was to examine relationships between mother and child behaviours with child body composition at age 24 months. Longitudinal secondary analysis of the Glowing cohort collected between 1 February 2011 and 22 August 2017 in Little Rock, Arkansas. Behaviours were measured using ankle-worn accelerometers in mothers during the first trimester and offspring at 24 months of age, including total activity, sleep, sedentary time and a novel variable of daily variation, patternicity. Child body fat was measured using quantitative nuclear magnetic resonance. Three phenotypes were identified for mothers and children (n = 159 complete dyads). There were no relationships between mother and child phenotypes, but higher maternal patternicity was associated with higher child patternicity (0.2, 95% CI 0.1, 0.3, p = 0.001). There were no associations between mother or child phenotypes with child body composition, however higher child activity was associated with lower body fat (-0.01, 95% CI: -0.02, -0.001, p = 0.031). Limited associations were found between mothers' pregnancy physical behaviours with child behaviours or child body composition at 24 months of age. Factors such as child diet or current parental physical activity may be better predictors of early childhood outcomes.

A115: Revision of the Chinese Version of Physical Self-Description Questionnaire-Short for Middle School Students

Purpose: The Physical Self-Description Questionnaire -Short (PSDQ-S) is one of the world's recognized effective tools for measuring Physical Self-Concept (PSC). However, Latent profile analysis of the physical self-description among Chinese adolescents only supported the 3-dimensional model of PSDQ-S, that is, it could only distinguish the Physical Activity (PA), Appearance, and Body Fat of Chinese children and adolescents, but could not effectively distinguish the 8 dimensions of Coordination, Flexibility, Strength, Endurance, Sport, Global Physical, Health, and Global Esteem. It cannot meet the needs of PSC measurement in the field of sports psychology in China. The purpose of this study was to revise the PSDQ-S for Chinese middle school students, and to test its reliability, validity, and gender measurement equivalence in Chinese middle school students. Methods: A stratified random cluster sampling method was used to conduct a questionnaire survey on the Chinese version of PSDQ-S. 2505 middle school students in grades 7-12 (12-18 years old) were selected from seven administrative geographic regions of North China, Northeast China, East China, Central China, South China, Southwest and Northwest China, among which 1239 were male subjects, with an average age of (15.07±1.93) years, Female subjects were 1266, with an average age of (15.02±2.04) years. SPSS 24.0 and Mplus 8.3 were used for data analysis. Results: Eight common factors were extracted by exploratory factor analysis, and the cumulative variance interpretation rate was 79.45%. Confirmatory factor analysis support 8 factor model hypothesis (χ2 / df = 1.846, CFI = 0.939, TLI = 0.929, SRMR = 0.050, RMSEA = 0.061). The 8 dimensions were Physical Activity, Appearance, Body Fat, Flexibility &amp; Coordination, Endurance, Sport, Global Physical and Health. The average variance extraction of each factor of the Chinese version PSDQ-S convergence validity index was greater than 0.50, and the combination reliability was greater than 0.60. The gender equivalence hypothesis was established. Conclusions: The revised Chinese version of PSDQ-S has good reliability, validity, and gender equivalence. It can be used as a measurement tool of PSC of Chinese middle school students.

Childhood body fatness and the risk of epithelial ovarian cancer: A population-based case-control study in Montreal, Canada

ObjectiveTo assess the association between childhood body fatness and epithelial ovarian cancer (EOC), and whether this association differs by type of EOC. MethodsUsing data from a population-based case-control study (497 cases and 902 controls) in Montreal, Canada conducted 2011–2016, we examined the association between childhood body fatness and EOC, overall and separately for invasive vs. borderline EOCs. A figure rating scale was used to measure body fatness at ages 5 and 10. Multivariable logistic regression was used to estimate adjusted odds ratios (aORs) and 95% confidence intervals (95% CI). Quantitative bias analyses were conducted to assess the impact of exposure misclassification and non-participation. ResultsThe aOR (95% CI) of overall EOC for high vs. low body fatness was 1.07 (0.85–1.34) at age 5 and 1.28 (0.98–1.68) at age 10. The associations were stronger for invasive EOC, specifically the endometrioid histological type. For borderline cancers, the aORs were below the null value with wide confidence intervals. Bias analyses did not reveal a strong influence of non-participation. Non-differential exposure misclassification may have biased aORs towards the null for invasive cancers but did not appear to have an appreciable influence on the aORs for borderline cancers. ConclusionsChildhood body fatness may be a risk factor for invasive EOC in later adult life. Our study highlights the potential importance of examining early life factors for a comprehensive understanding of EOC development.

FTO and MC4R polymorphisms, and selected pre-, peri- and postnatal factors as determinants of body mass index and fatness in children: a thorough analysis of the associations

BackgroundOverweight and obesity among children have become significant global health concerns. Previous studies have highlighted the potential role of genetic factors, particularly polymorphisms in the FTO and MC4R genes, as well as environmental factors in the development of childhood obesity. This study aimed to investigate the relationships between genetic, socioeconomic and perinatal factors, adverse childhood events (ACEs), and lifestyle, and their impact on overweight, obesity and body composition parameters in children. Additionally, we explored potential interactions between genetic factors and ACEs.MethodsFour hundred fifty-six children aged 6–12 years participated in our study. Information on the socioeconomic status, perinatal factors, ACEs and lifestyle of the children was collected with a questionnaire completed by their parents/guardians. We examined the children’s body weight and conducted an electrical bioimpedance analysis. Overweight and obesity were diagnosed based on the International Obesity Task Force and McCarthy criteria. We genotyped two selected polymorphisms in the FTO and MC4R genes using the TaqMan SNP allelic discrimination method.ResultsHigher BMI (Body Mass Index) z scores were related to higher paternal BMI and lower maternal age at the child’s birth. Higher FMI (Fat Mass Index) z scores were associated with higher paternal BMI, increased gestational weight, lower maternal education and the presence of the FTO risk allele. Higher FatM (fat mass in kg) z scores were linked to lower maternal education, lower maternal age at the child’s birth, higher maternal body weight gain, paternal BMI and the presence of the FTO risk allele. Moreover, interaction effects were observed on BMI z scores between ACE and FTO AA, and on FMI z scores and FatM z scored between ACE and MC4R CC.ConclusionsThe contribution of environmental factors is more strongly related to changes in body composition than genetic ones. Additionally, the presence of the risk allele combined with unfavourable environmental factors like ACEs leads to visible interaction effects, resulting in increased BMI z scores and FMI z scores in children.

Obesogenic neighborhood environment is associated with body fat and low-grade inflammation in Brazilian children: could the mother's BMI be a mediating factor?

To evaluate the direct and indirect associations of obesogenic and leptogenic neighborhood environments with body fat, and pro- and anti-inflammatory adipokines in Brazilian children. Cross-sectional study. The body fat distribution was assessed using dual-energy X-ray absorptiometry (DXA). Concentrations of leptin and adiponectin were measured. Four hundred meters (0·25 miles) road network buffer was the neighborhood unit used to assess the environmental characteristics around households. Obesogenic and leptogenic environments were the latent variables obtained from the observed characteristics. The mother's BMI, ultra-processed food consumption, and physical activity before and after school, were tested as mediating variables. A hybrid model of structural equations was used to test the direct and indirect associations of obesogenic and leptogenic environments with body fat, leptin and adiponectin concentrations. Urban area of Viçosa, Minas Gerais, Brazil. Children aged 8- and 9-years (n 367). Obesogenic environment was directly associated with the mother's BMI (β: 0·24, P = 0·02) and the child's body fat (β: 0·19, P = 0·02). The mother's BMI and body fat mediated the association of the obesogenic environment with leptin concentrations (β: 0·05, P = 0·02). Obesogenic neighborhood environment was directly associated with body fat and mother's BMI, and indirectly associated with leptin concentrations in Brazilian children, mediated by the mother's BMI and body fat.

О взаимосвязи некоторых антропометрических индексов с биоимпедансной оценкой относительной жировой массы у детей и подростков

Introduction. The study of adiposity in children and adolescents is an important issue in the era of the global epidemic of obesity. Body mass index is the most common, but not the only body fat index. There are also indexes based on waist and hip circumferences. The purpose of this work is to analyze the age variability and correlation between various anthropometric indices and bioimpedance estimates of the percentage of body fat in children and adolescents. Materials and methods. We analyzed the data of children and adolescents of both sexes 7-17 years old, 1885 boys and 1453 girls, collected in the course of cross-sectional anthropological surveys of schoolchildren in Moscow, Arkhangelsk and the Arkhangelsk region. Body mass index (BMI), waist-to-hip ratio (WHR), waist-to-height ratio (WHtR), hip-to-height ratio (HHtR) were calculated. The percentage of fat mass (% FM) was obtained by bioimpedance with the ABC-01 “Medas” device. Correlation analysis was used to assess the relationship between indices and %FM. Results and discussion. The paper analyzes the age-related variability of height and weight, BMI, waist circumference, hip circumference, WHR, WHtR, HHtR and % FM in children and adolescents of both sexes. Age-related changes in % FM have clear sex differences. In girls, during puberty, there is an accumulation of fat mass, while in boys – its decrease. Body weight, BMI, waist circumference, hip circumference, HHtR increase in the process of growth, WHR and WHtR decrease. For all indicators, except for WHR, in boys and girls in younger age groups, correlations with % FM are high and decrease with age, reaching average values. While the correlations of WHR with %FM are weak in all studied age groups. Conclusion. Based on the analysis performed, it is shown that body mass, waist circumference, hip circumference, BMI, WHtR, HHtR are good predictors of relative body fat mass, they significantly correlate with % FM, while WHR correlates very weakly. @ 2023. This work is licensed under a CC BY 4.0 license