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- Title
Validity of the relative fat mass pediatric index (RFMp) for the analysis of body composition in physically active youths at different stages of biological maturation.
- Authors
de Almeida‐Neto, Paulo Francisco; Cesário, Tatianny de Macêdo; Fernandes da Costa, Roberto; de Matos, Dihogo Gama; Aidar, Felipe J.; Dantas, Paulo Moreira Silva; Cabral, Breno Guilherme de Araújo Tinôco
- Abstract
Background: The paediatric relative fat mass (RFMp) index was valid for analysis of percent body fat (BF%). However, the validation did not consider biological maturation (BM) stages. The present study aimed to verify the validity of the RFMp index in the estimation of BF% in children and adolescents of both sexes at different stages of BM. Methods: A cross‐sectional study was conducted with a sample of 146 young (males: 64.5%. females: 35.5%. age: 13.0 ± 2.2 years) practising sports modalities. We tested the validity of four RFMp equations (1: for boys aged 8–14 years; 2: for girls aged 8–14 years; 3: for both sexes aged 8–14 years; and 4: for both sexes aged 15–19 years) to analyse BF% using dual‐energy X‐ray absorptiometry as a reference method. BM was analysed by peak height velocity (PHV). Thus, we created subgroups by BM stage (pre‐PHV, circum‐PHV and post‐PHV). Results: Analyses of agreement between methods showed that only the RFMp‐3 equation was reliable to analyse BF% in subjects of both sexes aged 8–14 years at the circum‐PHV BM stage (proportion bias 95% confidence interval = −0.3 to 0.5, p = 0.7. concordance correlation coefficient = 0.3; validity = 0.9). Conclusions: The RFMp equation developed for the paediatric population of both sexes aged 8–14 years was valid for predicting BF% in children and adolescents of both sexes at the Circum‐PHV stage of the BM. Key points: When segregating the sample by stage of biological maturation (BM), the analyses of agreement between the methods pointed out that only the paediatric relative fat mass (RFMp) equation developed for both sexes aged 8–14 years was effective in estimating the percent body fat only in boys and girls in circum‐peak height velocity (PHV) BM stage.We suggest that additional studies develop appropriate equations to predict body fat percentage in boys and girls at pre‐ and post‐PHV BM stages.
- Subjects
BODY composition; PHOTON absorptiometry; CONFIDENCE intervals; RESEARCH methodology; RESEARCH methodology evaluation; CROSS-sectional method; ANTHROPOMETRY; PUBERTY; PEDIATRICS; PHYSICAL activity; DESCRIPTIVE statistics; BODY mass index; STATISTICAL correlation; ADIPOSE tissues; CHILDREN; ADOLESCENCE
- Publication
Journal of Human Nutrition & Dietetics, 2023, Vol 36, Issue 4, p1270
- ISSN
0952-3871
- Publication type
Article
- DOI
10.1111/jhn.13161