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Biomédica
versão impressa ISSN 0120-4157versão On-line ISSN 2590-7379
Resumo
LOPEZ, Ana Lucía; VELEZ, Juan David; GARCIA, Angélica María e ARANGO, Elkin Fernando. Concurrent validity of five prediction equations to evaluate fat percentage in a sports group expected to yield high performance from Medellín, Colombia. Biomed. [online]. 2021, vol.41, n.1, pp.131-144. Epub 19-Mar-2021. ISSN 0120-4157. https://doi.org/10.7705/biomedica.5333.
Introduction:
No equations to predict the body composition of athletes from Medellín expected to have high performance have been constructed and, thus, decisions regarding their training and nutrition plans lack support.
Objective:
To calculate the concurrent validity of five prediction equations for fat percentage in a group of athletes from Medellín, Colombia, expected to yield high performance.
Materials and methods:
We conducted a cross-sectional analysis to validate diagnostic tests using secondary-source data of athletes under the age of 18 who were part of the "Medellín Team'.' The gold standard was dual-energy X-ray densitometry (DEXA). We analyzed the Slaughter, Durnin and Rahaman, Lohman, and Johnston prediction equations, as well as the five-component model. We used the intraclass correlation coefficient to assess the consistency of the methods and the Bland-Altman plot to calculate the average bias and agreement limits of each of the equations.
Results:
We included 101 athletes (50,5 % of them women). The median age was 14,8 years (IR: 13,0 - 16,0). The concurrent validity was "good/excellent" for the Johnston and the Durnin and Rahaman equations and the five-components model. The Lohman equation overestimated the fat percentage in 12,7 points. All of the equations showed broad agreement limits.
Conclusions:
The Durnin and Rahaman and the Johnston equations, as well as the five-component model, can be used to predict the FP in the study population as they showed a "good/excellent" concurrent validity and a low average bias. The equations analyzed have low accuracy, which hinders their use to diagnose the individual fat percentage within this population.
Palavras-chave : Body composition; nutritional status; anthropometry; child; adolescent; nutrition assessment; adipose tissue; absorptiometry, photon.