RESUMEN
Near infrared reactance (NIR) is used to measure body fat percentage (BF%), but there is little data on its use in non-obese, regularly exercising individuals. Therefore, this study aimed to examine the limits of agreement between NIR compared to dual x-ray absorptiometry (DXA) for the measurement of BF% in 2 cohorts of regularly exercising individuals. BF% was measured using DXA and NIR in a regular exercising (≥3 sessions/week), healthy active cohort (HA; n=57), and in a regularly exercising and resistance trained (≥2 sessions/week) cohort (RT; n=59). The RT cohort had lower BF% than the HA cohort (15.3±5.5% and 25.8±7.1%, P<0.001). In the HA and RT cohorts, NIR BF% was associated with DXA BF% (R2=0.72, SEE=3.7, p<0.001 and R2=0.50, SEE=4.1 p<0.001, respectively). In the HA cohort, NIR tended to under-predict BF% (mean difference: - 1.3%; 95% limits of agreement (LOA); - 8.8 to 6.2%) whereas in the RT cohort, NIR tended to over-predict BF% compared to DXA (mean difference: 1.1; 95% LOA; - 8.1 to 10.3%). In conclusion, NIR and DXA yield similar average BF% measurements in 2 cohorts of non-obese regularly exercising individuals. However, the rather broad LOA of NIR need to be considered when using NIR to screen for overweight and obesity, or measure and track changes in body composition.
Asunto(s)
Tejido Adiposo/fisiología , Adiposidad/fisiología , Composición Corporal/fisiología , Entrenamiento de Fuerza/métodos , Absorciometría de Fotón/métodos , Adulto , Distribución de la Grasa Corporal , Estudios de Cohortes , Ejercicio Físico/fisiología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Adulto JovenRESUMEN
A single locus controlling self-incompatibility (SI) was located on an RFLP and RAPD linkage map of Brassica oleracea by assaying for SI phenotype and segregation of an RFLP locus detected by the cloned St gene SLG6. The map was developed using an F2 population derived from a cabbage x broccoli cross and included 112 RFLP and 47 RAPD loci arranged into nine main linkage groups covering 921 cM. A portion of the population was assayed for St reaction by pollinating with the broccoli parent. The SI reactions cosegregated precisely with the RFLP locus detected by SLG6, and this locus mapped to linkage group 2.