Agreement between BMI and body fat obesity definitions in a physically active population
Arch. endocrinol. metab. (Online)
;
60(6): 515-525, Nov.-Dec. 2016. tab, graf
Artículo
en Inglés
| LILACS
| ID: biblio-827796
ABSTRACT
ABSTRACT Objectives Body mass index (BMI) is a widely used proxy of body composition (BC). Concerns exist regarding possible BMI misclassification among active populations. We compared the prevalence of obesity as categorized by BMI or by skinfold estimates of body fat percentage (BF%) in a physically active population. Subjects and methods 3,822 military firefighters underwent a physical fitness evaluation including cardiorespiratory fitness (CRF) by the 12 min-Cooper test, abdominal strength by sit-up test (SUT) and body composition (BC) by BF% (as the reference), as well as BMI. Obesity was defined by BF% > 25% and BMI ≥ 30 kg/m2. Agreement was evaluated by sensitivity and specificity of BMI, positive and negative predictive values (PPV/NPV), positive and negative likelihood (LR+/LR-), receiver operating characteristic (ROC) curves and also across age, CRF and SUT subgroups. Results The prevalence of obesity estimated by BMI (13.3%) was similar to BF% (15.9%). Overall agreement was high (85.8%) and varied in different subgroups (75.3-94.5%). BMI underestimated the prevalence of obesity in all categories with high specificity (≥ 81.2%) and low sensitivity (≤ 67.0). All indices were affected by CRF, age and SUT, with better sensitivity, NPV and LR- in the less fit and older groups; and higher specificity, PPV and LR+ among the fittest and youngest groups. ROC curves showed high area under the curve (≥ 0.77) except for subjects with CRF ≥ 14 METs (= 0.46). Conclusion Both measures yielded similar obesity prevalences, with high agreement. BMI did not overestimate obesity prevalence. BMI ≥ 30 was highly specific to exclude obesity. Because of systematic under estimation, a lower BMI cut-off point might be considered in this population.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Índice de Masa Corporal
/
Tejido Adiposo
/
Obesidad
Tipo de estudio:
Estudio diagnóstico
/
Estudio observacional
/
Estudio de prevalencia
/
Estudio pronóstico
/
Factores de riesgo
Límite:
Adulto
/
Humanos
/
Masculino
Idioma:
Inglés
Revista:
Arch. endocrinol. metab. (Online)
Asunto de la revista:
Endocrinologia
/
Metabolismo
Año:
2016
Tipo del documento:
Artículo
País de afiliación:
Estados Unidos
Institución/País de afiliación:
Harvard T. H. Chan School of Public Health/US
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