Identification of and Associations among Low, Middle, and High Body Composition Trajectories from Age 5- to 17-Years

Abstract

Our objective was to identify sex-specific age 5- to 17-year body composition (body mass index (BMI), % body fat, fat mass index, fat-free mass index) trajectories, compare trajectories assigned using age 5 (AGE5) data to those assigned using all available (ALL) data, and compare BMI assignments to other body composition assignments. Cluster analysis was used to identify low, medium, and high trajectories from body composition measures obtained from dual energy x-ray absorptiometry (DXA) scans at 5, 9, 11, 13, 15, and 17 years in a birth cohort followed longitudinally (n = 469). Moderate agreement was observed for comparisons between AGE5 data and ALL data cluster assignments for each body composition measure. Agreement between cluster assignments for BMI and other body composition measures was stronger using ALL data than using AGE5 data. Our results suggest that BMI, % body fat, fat mass index, and fat free mass index trajectories are established during early childhood, and that BMI is a reasonable predictor of body composition appropriate to track obesity in public health and clinical settings.

Premorbid body weight predicts weight loss in both anorexia nervosa and atypical anorexia nervosa: Further support for a single underlying disorder

“…Notably, in our study, premorbid body weight status was defined via a single estimation of premorbid BMI upon initial weight loss. We nevertheless regard the existent clinical, epidemiological, and genetic data as indirect support in light of short‐ and medium‐term tracking of age‐adjusted BMI in children and adolescents (e.g., Marshall et al, 2020). Matthews et al (2024) report a high correlation between estimated premorbid BMI based on recalled weight at initial onset of weight loss and estimated premorbid BMI based on historical growth data, measured and recorded by providers prior to illness development.…”

Classificação do estado nutricional de adultos jovens mediante o índice de massa gorda: uma comparação entre instrumentos

“…Na infância essas diferenças são menores entre os sexos, mas na adolescência se acentuam (EISSA et al, 2009;FREEDMAN et al, 2005;GUO et al, 2017;HATTORI et al, 2004;XIONG et al, 2012). As diferenças sexuais ocorrem mesmo quando IMC são semelhantes entre ambos (GUO et al, 2017;HATTORI et al, 2004;LU et al, 2012;PARK et al, 2011;XIONG et al, 2012 MARSHALL et al, 2020). Meninas e meninos que entram em puberdade precoce, exibem maiores valores de IMG e IMIG (BUYKEN et al, 2011;LABAYEN et al, 2009).…”