Changes in body composition and cardiometabolic risk factors in relation to the reduction in body mass index in adolescents with obesity / Cambios en la composición corporal y factores de riesgo cardiometabólico en relación con la reducción del índice de masa corporal en adolescentes con obesidad

Introduction: there are controversial data in relation to the reduction in body mass index standard deviation score (BMI-SDS) needed to improve adiposity in the pediatric population with obesity. The aim of this work was to determine the minimum variation in BMI-SDS required to improve the values of adiposity markers and cardiometabolic risk factors in growing adolescents with obesity. Methods: a longitudinal study consisting of clinical evaluation (waist circumference, waist-to-height ratio, fat mass index, and blood pressure) and blood testing (insulin resistance and lipid profile) was conducted in 350 adolescents with obesity (152 boys and 198 girls) aged 10.2-14.3 years who went through a combined intervention (12 months). Results: a decrease in SDS-BMI ≤ 0.5 was not associated with any significant improvement in the clinical features and blood testing recorded. A decrease in BMI-SDS > 0.5, and especially if > 1.0, was linked to a significant improvement in adiposity markers. A decrease in BMI-SDS > 0.5 was associated with a significant improvement in insulin resistance, and a decrease in BMI-SDS > 1.0 was associated with a significant decrease in the percentage of patients who showed high values of systolic blood pressure, HOMA-IR, and lipid profile Conclusions: improvement in body composition, insulin resistance, and lipid profile can be observed with reductions in BMI-SDS ≥ 0.5 in obese adolescents, while extended benefits are obtained by losing at least 1.0 BMI-SDS (AU)

Introducción: los datos en relación con la reducción del índice de masa corporal (IMC-SDS) necesario para mejorar la adiposidad en la población pediátrica con obesidad son controvertidos. El objetivo de este trabajo es determinar la variación mínima del IMC-SDS necesaria para mejorar los valores de los marcadores de adiposidad y los factores de riesgo cardiometabólico en adolescentes obesos. Métodos: estudio longitudinal clínico (perímetro de cintura, índice cintura-estatura e índice de masa grasa y presión arterial) y analítico (HOMA-R y perfil lipídico) realizado en 350 adolescentes con obesidad (152 niños y 198 niñas) de entre 10,2 y 14,3 años de edad que completaron una intervención combinada (12 meses). Resultados: una disminución en el índice de masa corporal (SDS-BMI) ≤ 0,5 no se asoció con ninguna mejora significativa de las características clínicas y analíticas registradas. Una disminución del IMC-SDS > 0,5, y especialmente si > 1,0, se relacionó con una mejora significativa de los marcadores clínicos de adiposidad. Una disminución del IMC-SDS > 0,5 se asoció con una mejora significativa de la resistencia a la insulina y una disminución del BMI-SDS > 1,0 se asoció con una disminución significativa del porcentaje de pacientes que mostraban valores altos de presión arterial sistólica, HOMA-IR y perfil lipídico Conclusiones: con una reducción del IMC-SDS ≥ 0,5 se observa una mejoría tanto en la composición corporal como en los factores de riesgo cardiovascular en los adolescentes obesos; no obstante, estos beneficios son mayores si la reducción del IMC-SDS es superior a 1.0 (AU)

Do substantial BMI reduction episodes among Swedish schoolchildren have any impact on their final height?

AIM: This study investigated whether substantial body mass index (BMI) reductions in Swedish schoolchildren aged seven years to 19 years, caused by disease, healthy or unhealthy behaviour, had any impact on their final height. METHODS: We used height and weight data on 6572 subjects from two nationally representative longitudinal samples of Swedish children born in 1973 and 1981. These provided information on their final height and any BMI reduction episodes. RESULTS: Of the 6572 subjects (50.9% boys), among individuals with information on final height, 1118 had a BMI reduction of 5% and <10%, and 346 had at least one substantial BMI reduction of 10% or more. On a group level, there was no statistically significant difference in the final height of individuals with BMI reductions of 10% or more and those without. The findings were independent of age and the subject's BMI at the start of the reduction episode. However, there were a number of cases where a substantial BMI reduction probably had an impact on the subject's final height. CONCLUSION: Our study found no evidence that a substantial BMI reduction had any impact on final height on a group level, but further analyses of specific case studies are necessary to determine whether substantial BMI reduction might have an impact on final height.