Relative Fat Mass as an estimator of whole-body fat percentage among children and adolescents: A cross-sectional study using NHANES

Abstract We evaluated the ability of the Relative Fat Mass (RFM) to estimate whole-body fat percentage among children and adolescents who participated in the National Health and Nutrition Examination Survey from 1999 through 2006 (n = 10,390). The RFM equation for adults (64 − (20 × height/waist circumference) + (12 × sex)) may be used for adolescents 15 to 19 years of age. For children and adolescents 8 to 14 years of age, we suggest a modified RFM equation, named as the RFMp (RFM pediatric): 74 − (22 × height/waist circumference) + (5 × sex). In both equations, sex equals 0 for boys and 1 for girls. RFMp was more accurate than BMI to estimate whole-body fat percentage (measured by dual energy X-ray absorptiometry, DXA) among girls (percentage of estimates that were <20% of measured body fat percentage, 88.2% vs. 85.7%; P = 0.027) and boys 8 to 14 years of age (83.4% vs. 71.0%; P < 0.001). RFM was more accurate than BMI among boys 15 to 19 years of age (82.3% vs. 73.9%; P < 0.001) but slightly less accurate among girls (89.0% vs. 92.6%; P = 0.002). Compared with BMI-for-age percentiles, RFMp had lower misclassification error of overweight or obesity (defined as a DXA-measured body fat percentage at the 85th percentile or higher) among boys 8 to 14 years of age (6.5% vs. 7.9%; P = 0.018) but not girls (RFMp: 8.2%; BMI-for-age: 7.9%; P = 0.681). Misclassification error of overweight or obesity was similar for RFM and BMI-for-age percentiles among girls (RFM: 8.0%; BMI-for-age: 6.6%; P = 0.076) and boys 15 to 19 years of age (RFM: 6.9%; BMI-for-age: 7.8%; P = 0.11). RFMp for children and adolescents 8 to 14 years of age and RFM for adolescents 15 to 19 years of age were useful to estimate whole-body fat percentage and diagnose body fat-defined overweight or obesity.

Download Full-text

Relative fat mass (RFM) as a new estimator of whole-body fat percentage ─ A cross-sectional study in American adult individuals

Scientific Reports ◽

10.1038/s41598-018-29362-1 ◽

2018 ◽

Vol 8 (1) ◽

Cited By ~ 42

Author(s):

Orison O. Woolcott ◽

Richard N. Bergman

Keyword(s):

Body Fat ◽

Fat Mass ◽

Cross Sectional Study ◽

Whole Body ◽

Body Fat Percentage ◽

Sectional Study ◽

Fat Percentage ◽

Cross Sectional ◽

American Adult

Download Full-text

The Influence of Age, Sex and Body Mass Index on the Effectiveness of Brisk Walking for Obesity Management in Adults: A Systematic Review and Meta-Analysis

Journal of Physical Activity and Health ◽

10.1123/jpah.2016-0064 ◽

2017 ◽

Vol 14 (5) ◽

pp. 389-407 ◽

Cited By ~ 5

Author(s):

Leon Mabire ◽

Ramakrishnan Mani ◽

Lizhou Liu ◽

Hilda Mulligan ◽

David Baxter

Keyword(s):

Body Mass Index ◽

Body Weight ◽

Waist Circumference ◽

Body Fat ◽

Fat Mass ◽

Fat Free Mass ◽

Body Fat Percentage ◽

Brisk Walking ◽

Obesity Management ◽

Fat Percentage

Background:Brisk walking is the most popular activity for obesity management for adults. We aimed to identify whether participant age, sex and body mass index (BMI) influenced the effectiveness of brisk walking.Methods:A search of 9 databases was conducted for randomized controlled trials (RCTs). Two investigators selected RCTs reporting on change in body weight, BMI, waist circumference, fat mass, fat-free mass, and body fat percentage following a brisk walking intervention in obese adults.Results:Of the 5072 studies screened, 22 met the eligibility criteria. The pooled mean differences were: weight loss, –2.13 kg; BMI, –0.96 kg/m2; waist circumference, –2.83 cm; fat mass, –2.59 kg; fat-free mass, 0.29 kg; and body fat percentage, –1.38%. Meta-regression of baseline BMI showed no effect on changes.Conclusions:Brisk walking can create a clinically significant reduction in body weight, BMI, waist circumference, and fat mass for obese men and women aged under 50 years. Obese women aged over 50 years can achieve modest losses, but gains in fat-free mass reduce overall change in body weight. Further research is required for men aged over 50 years and on the influence of BMI for all ages and sexes.

Download Full-text

Anthropometric measures associated with fat mass estimation in children and adolescents with HIV

Applied Physiology Nutrition and Metabolism ◽

10.1139/apnm-2018-0230 ◽

2019 ◽

Vol 44 (5) ◽

pp. 493-498

Author(s):

Carlos A.S. Alves Junior ◽

Luiz Rodrigo Augustemak de Lima ◽

Michele Caroline de Souza ◽

Diego Augusto Santos Silva

Keyword(s):

Children And Adolescents ◽

Body Fat ◽

Cross Sectional Study ◽

Body Fat Percentage ◽

Fat Percentage ◽

Anthropometric Measures ◽

Cross Sectional ◽

Significance Level ◽

Air Displacement Plethysmography ◽

Anthropometric Indicators

To verify the association between anthropometric indicators and body fat percentage estimated by dual X-ray absorptiometry (DXA) and air displacement plethysmography (ADP) in children and adolescents diagnosed with human immunodeficiency virus (HIV). This cross-sectional study was carried out with 62 children and adolescents with HIV (aged 8 to 15 years). Body fat percentage was estimated by DXA and ADP. Anthropometric indicators were skinfolds (abdominal, triceps, subscapular, calf), perimeter relaxed arm (PRA), waist circumference (WC), perimeter neck, body mass index (BMI), waist-to-height ratio, conicity index, and body adiposity index. Linear regressions were performed with 5% significance level. In boys (adjusted R2 (R2adj) = 0.38 to R2adj = 0.67) and girls (R2adj = 0.41 to R2adj = 0.57), all anthropometric indicators were associated with body fat percentage estimated by DXA. For boys, skinfolds were associated with body fat percentage estimated by ADP (R2adj = 0.18 to R2adj = 0.35). In girls, skinfolds (R2adj = 0.27 to R2adj = 0.44, BMI (R2adj = 0.31), PRA (R2adj = 0.36), and WC (R2adj = 0.26) were associated to body fat percentage by ADP. Abdominal skinfold was the indicator that most explained the variation in body fat percentage measured by DXA and ADP in both sexes. Anthropometric indicators are strongly associated with body fat, measured by reference methods, and can assist health professionals in monitoring the health of children and adolescents with HIV.

Download Full-text

Strength Training and Insulin Resistance: The Mediating Role of Body Composition

Journal of Diabetes Research ◽

10.1155/2020/7694825 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

McKayla J. Niemann ◽

Larry A. Tucker ◽

Bruce W. Bailey ◽

Lance E. Davidson

Keyword(s):

Insulin Resistance ◽

Waist Circumference ◽

Strength Training ◽

Body Fat ◽

Fat Free Mass ◽

Outcome Variable ◽

Body Fat Percentage ◽

Fat Percentage ◽

Cross Sectional ◽

Confounding Variables

The main objective of the present study was to assess the association between participation in strength training and insulin resistance. Another goal was to assess the influence of several potential confounding variables on the strength training and insulin resistance relationship. Lastly, the influence of waist circumference, fat-free mass (kg), body fat percentage, and the fat-free mass index on the association between strength training and insulin resistance was assessed. This cross-sectional study included 6,561 randomly selected men and women in the U.S. Data were collected using the precise protocol established by NHANES. HOMA-IR was used as the outcome variable to index insulin resistance. Both time spent strength training and frequency of strength training bouts were used as exposure variables. There was not a statistically significant relationship between strength training and insulin resistance in women. However, before and after controlling for 11 potential confounding variables, men who reported no strength training had significantly higher levels of HOMA-IR compared to men who reported moderate or high levels of strength training (F=9.87, P<0.0001). Odds ratios were also assessed. Men reporting no strength training had 2.42 times the odds of having insulin resistance compared to men reporting moderate levels of strength training (95% CI: 1.19-4.93). Similarly, men reporting no strength training had 2.50 times the odds of having insulin resistance compared to men reporting high levels of strength training (95% CI: 1.25-5.00). In conclusion, there was a strong relationship between strength training and insulin resistance in U.S. men, but not in U.S. women. Differences in waist circumference, fat-free mass (kg), body fat percentage, and the fat-free mass index, as well as demographic and lifestyle measures, do not appear to mediate the relationship. The present study was not a clinical trial.

Download Full-text

Knowledge, Attitude and Practices (KAP) of Sugar Sweetened Beverages (SSBs) Amongst Adolescents in Malaysian Secondary Schools: A cross-Sectional Study

10.21203/rs.3.rs-46842/v1 ◽

2020 ◽

Author(s):

NUR ISLAMI MOHD FAHMI TENG ◽

Norsham Juliana Nordin ◽

Nur Liyana Izlin Mohamad Rodi ◽

Nur Zulaikha Semaon

Keyword(s):

Waist Circumference ◽

Secondary Schools ◽

Body Fat ◽

Cross Sectional Study ◽

Body Fat Percentage ◽

Sectional Study ◽

Fat Percentage ◽

Sugar Sweetened Beverages ◽

Cross Sectional ◽

Sweetened Beverages

Abstract Background: This study aims to examine the level of knowledge, attitude and practices (KAP) of adolescents towards sugar-sweetened beverages (SSB) together with the associated factors that determines their KAP. Methods: This is a cross-sectional study. Data was collected using self-administered questionnaires that consisted of sociodemographic, the KAP for the SSB questionnaire, and the BEVQ questionnaire. The respondents’ height, weight, waist circumference and body fat percentage were measured. This study involved 439 adolescents (with a 97.6% response rate), aged between 13 to 17 years old, in public secondary schools in Selangor, Malaysia. Results: The results reveal that 35% of the adolescents were overweight, 26% had a high waist circumference, and 45% had a high body fat percentage. Caffeinated drinks and full cream milk were the most frequently consumed SSBs. The KAP score revealed a high attitude (88.4%), a moderate knowledge (51.8%) and a low practice (40.5%). Those with a higher body fat percentage showed significantly higher attitude scores (p<0.05). Low household income groups (adjusted OR=0.51; 95% CI=0.26-0.99), females (adjusted OR=0.41, 95% CI=0.27-0.62), adolescents aged 16-17 years old (adjusted OR=0.44, 95% CI=0.22-0.85), and urban areas (adjusted OR=1.78, 95% CI=1.16-2.72) demonstrated a significant (p<0.05) positive determinant towards the KAP score. Conclusion: This study revealed that high awareness of negative health outcomes associated with SSBs among adolescents was not in accord with the level of their lifestyle choices. Future interventions must consider this critical situation so that any knowledge being transferred to the adolescents can be translated into their own practices.

Download Full-text

Comparison of the Effect of Soy protein and Whey protein on Body Composition: A Meta-Analysis of Randomized Clinical Trials

British Journal Of Nutrition ◽

10.1017/s0007114521001550 ◽

2021 ◽

pp. 1-27

Author(s):

Masoome Piri Damaghi ◽

Atieh Mirzababaei ◽

Sajjad Moradi ◽

Elnaz Daneshzad ◽

Atefeh Tavakoli ◽

...

Keyword(s):

Body Composition ◽

Whey Protein ◽

Lean Body Mass ◽

Body Mass ◽

Body Fat ◽

Fat Mass ◽

Soy Protein ◽

Protein Supplementation ◽

Body Fat Percentage ◽

Fat Percentage

Abstract Background: Essential amino acids (EAAs) promote the process of regulating muscle synthesis. Thus, whey protein that contains higher amounts of EAA can have a considerable effect on modifying muscle synthesis. However, there is insufficient evidence regarding the effect of soy and whey protein supplementation on body composition. Thus, we sought to perform a meta-analysis of published Randomized Clinical Trials that examined the effect of whey protein supplementation and soy protein supplementation on body composition (lean body mass, fat mass, body mass and body fat percentage) in adults. Methods: We searched PubMed, Scopus, and Google Scholar, up to August 2020, for all relevant published articles assessing soy protein supplementation and whey protein supplementation on body composition parameters. We included all Randomized Clinical Trials that investigated the effect of whey protein supplementation and soy protein supplementation on body composition in adults. Pooled means and standard deviations (SD) were calculated using random-effects models. Subgroup analysis was applied to discern possible sources of heterogeneity. Results: After excluding non-relevant articles, 10 studies, with 596 participants, remained in this study. We found a significant increase in lean body mass after whey protein supplementation weighted mean difference (WMD: 0.91; 95% CI: 0.15, 1.67. P= 0.019). Subgroup analysis, for whey protein, indicated that there was a significant increase in lean body mass in individuals concomitant to exercise (WMD: 1.24; 95% CI: 0.47, 2.00; P= 0.001). There was a significant increase in lean body mass in individuals who received 12 or less weeks of whey protein (WMD: 1.91; 95% CI: 1.18, 2.63; P<0.0001). We observed no significant change between whey protein supplementation and body mass, fat mass, and body fat percentage. We found no significant change between soy protein supplementation and lean body mass, body mass, fat mass, and body fat percentage. Subgroup analysis for soy protein indicated there was a significant increase in lean body mass in individuals who supplemented for 12 or less weeks with soy protein (WMD: 1.48; 95% CI: 1.07, 1.89; P< 0.0001). Conclusion: Whey protein supplementation significantly improved body composition via increases in lean body mass, without influencing fat mass, body mass, and body fat percentage.

Download Full-text

Trends in obesity and adiposity measures by race or ethnicity among adults in the United States 2011-18: population based study

BMJ ◽

10.1136/bmj.n365 ◽

2021 ◽

pp. n365

Author(s):

Buyun Liu ◽

Yang Du ◽

Yuxiao Wu ◽

Linda G Snetselaar ◽

Robert B Wallace ◽

...

Keyword(s):

Body Mass Index ◽

Waist Circumference ◽

Ethnic Groups ◽

Body Mass ◽

Body Fat ◽

Lean Mass ◽

The United States ◽

Population Based ◽

Body Fat Percentage ◽

Fat Percentage

AbstractObjectiveTo examine the trends in obesity and adiposity measures, including body mass index, waist circumference, body fat percentage, and lean mass, by race or ethnicity among adults in the United States from 2011 to 2018.DesignPopulation based study.SettingNational Health and Nutrition Examination Survey (NHANES), 2011-18.ParticipantsA nationally representative sample of US adults aged 20 years or older.Main outcome measuresWeight, height, and waist circumference among adults aged 20 years or older were measured by trained technicians using standardized protocols. Obesity was defined as body mass index of 30 or higher for non-Asians and 27.5 or higher for Asians. Abdominal obesity was defined as a waist circumference of 102 cm or larger for men and 88 cm or larger for women. Body fat percentage and lean mass were measured among adults aged 20-59 years by using dual energy x ray absorptiometry.ResultsThis study included 21 399 adults from NHANES 2011-18. Body mass index was measured for 21 093 adults, waist circumference for 20 080 adults, and body fat percentage for 10 864 adults. For the overall population, age adjusted prevalence of general obesity increased from 35.4% (95% confidence interval 32.5% to 38.3%) in 2011-12 to 43.4% (39.8% to 47.0%) in 2017-18 (P for trend<0.001), and age adjusted prevalence of abdominal obesity increased from 54.5% (51.2% to 57.8%) in 2011-12 to 59.1% (55.6% to 62.7%) in 2017-18 (P for trend=0.02). Age adjusted mean body mass index increased from 28.7 (28.2 to 29.1) in 2011-12 to 29.8 (29.2 to 30.4) in 2017-18 (P for trend=0.001), and age adjusted mean waist circumference increased from 98.4 cm (97.4 to 99.5 cm) in 2011-12 to 100.5 cm (98.9 to 102.1 cm) in 2017-18 (P for trend=0.01). Significant increases were observed in body mass index and waist circumference among the Hispanic, non-Hispanic white, and non-Hispanic Asian groups (all P for trend<0.05), but not for the non-Hispanic black group. For body fat percentage, a significant increase was observed among non-Hispanic Asians (30.6%, 29.8% to 31.4% in 2011-12; 32.7%, 32.0% to 33.4% in 2017-18; P for trend=0.001), but not among other racial or ethnic groups. The age adjusted mean lean mass decreased in the non-Hispanic black group and increased in the non-Hispanic Asian group, but no statistically significant changes were found in other racial or ethnic groups.ConclusionsAmong US adults, an increasing trend was found in obesity and adiposity measures from 2011 to 2018, although disparities exist among racial or ethnic groups.

Download Full-text

Characterization and prevalence of obesity among normal weight college students

International Journal of Adolescent Medicine and Health ◽

10.1515/ijamh-2020-0240 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Kara C. Anderson ◽

Katie R. Hirsch ◽

Austin M. Peterjohn ◽

Malia N.M. Blue ◽

Alexis A. Pihoker ◽

...

Keyword(s):

College Students ◽

Body Fat ◽

Fat Mass ◽

Vigorous Physical Activity ◽

Normal Weight ◽

High Density ◽

High Density Lipoproteins ◽

Cardiometabolic Health ◽

Body Fat Percentage ◽

Fat Percentage

AbstractNormal weight obesity (NWO) describes individuals who have a normal weight body mass index (BMI), but have an unhealthy amount of body fat. Based on the life-long habits that develop during college, exploring NWO among a college-aged population may be essential in identifying and preventing obesity that develops in early adulthood. This study aimed to characterize NWO among young adults with normal weight BMI. 94 college students (Mean ± SD: Age: 19.6 ± 1.5 yrs; BMI: 21.9 ± 1.8 kg/m2) enrolled during the Fall semester (Aug-Oct) were assessed for body composition by dual energy X-ray absorptiometry to determine body fat percentage, fat mass, lean mass and trunk fat; lifestyle habits were characterized from validated questionnaires. Mean arterial pressure and metabolic biomarkers [total cholesterol, high density lipoproteins, non-high density lipoproteins, and glucose] were evaluated for cardiometabolic health. NWO was defined using data from the National Health and Nutrition Examination Survey (NHANES) for body fat percentage. Data was analyzed by group (NWO vs NWL) and sex. with independent t-tests to investigate continuous data, and chi-square test of independence for categorical data. Rates of NWO for the total sample were 13.8%. Males (n=30) had a higher rate of NWO (26.7%) compared to females (n=64; 7.8%). NWO individuals had higher fat mass (p=0.024), trunk fat (p<0.001), and larger waist to hip ratio (p<0.001) than normal weight lean. NWO also engaged in less vigorous physical activity (p=0.043). The occurrence of NWO among otherwise healthy college students is evident. Identification of these individuals may be an effective component for obesity prevention and treatment. Determining feasible methods to measure body fat in this population is essential, as BMI may mask obesity in a young adult population.

Download Full-text

Uric acid is associated with adiposity factors, especially with fat mass reduction during weight loss in obese children and adolescents

Nutrition & Metabolism ◽

10.1186/s12986-020-00500-9 ◽

2020 ◽

Vol 17 (1) ◽

Author(s):

Yang Niu ◽

Xue-lin Zhao ◽

Hui-juan Ruan ◽

Xiao-meng Mao ◽

Qing-ya Tang

Keyword(s):

Weight Loss ◽

Body Composition ◽

Uric Acid ◽

Children And Adolescents ◽

Body Fat ◽

Fat Mass ◽

Dietary Control ◽

Obese Children ◽

Fat Percentage ◽

Before And After

Abstract Background Current adult studies suggest that uric acid (UA) is associated with body fat, but the relationship in obese children is unclear. Thus, we aim to evaluate the association between uric acid and body composition of obese children. Methods A total of 79 obese children were included in this study, and 52 children (34 boys and 18 girls) underwent a 6-week weight loss camp, including 34 boys and 18 girls. Six-week weight-loss interventions were performed on all participants through aerobic exercise and appropriate dietary control. Laboratory tests and body composition were collected before and after the intervention. Results Before the intervention, correlation analysis demonstrated that uric acid was positively correlated with height, weight, body mass index (BMI), waist circumference, hip circumference, fat mass (FM), and free fat mass (FFM) with adjusting for age and gender (P < 0.05). After 6 weeks of intervention, the participants gained 3.12 ± 0.85 cm in height, body fat percentage decreased by 7.23 ± 1.97%, and lost 10.30 ± 2.83 kg in weight. Univariate and multivariate analysis indicated that uric acid at baseline was associated with FM reduction during weight loss (P < 0.05). Conclusions This study is the first report that uric acid is associated with BMI and FM, and may play an important role in the reduction of FM during weight loss in obese children and adolescents. The interaction between UA and adiposity factors and its underlying mechanisms need to be further explored. Trial registration This study was registered in Clinical Trials.gov (NCT03490448) and approved by the Ethics Committee of Xinhua Hospital, Shanghai Jiao Tong University School of Medicine.

Download Full-text