Oxygen uptake of overweight and obese children at different stages of a progressive treadmill test. (Consumo de oxígeno de niños y niñas con sobrepeso y obesos en los diferentes estadios de una prueba progresiva en un tapiz rodante).

Abstract

Consumo de oxígeno de niños y niñas con sobrepeso y obesos en los Consumo de oxígeno de niños y niñas con sobrepeso y obesos en los diferentes estadios de una prueba progresiva en un tapiz rodante. diferentes estadios de una prueba progresiva en un tapiz rodante.Agustín Meléndez-Ortega Facultad de Ciencias de la Actividad Física y del Deporte-INEF-UPM. EspañaCatherine Lucy Davis Paule Barbeau Colleen Ann Boyle Georgia Prevention Institute, Department of Pediatrics, Medical College of Georgia. USA Introduction: Maximal oxygen uptake (VO2 max) is associated with cardiovascular and metabolic risks but it is difficult to assess in obese children. The objective of this study was to develop an equation to estimate VO2 (mL/kg/min) and to check the % of tests that were maximal according to recommended criteria. Methods: Stress tests were analyzed of 222 subjects (94 male and 128 female with a BMI above the 85 percentile for age and sex), and repeated 4 months later. Mean age was 9.4 + 1.1 years and weighed 52.4 + 13.3 kg. Body fat % (40.5 + 6.2) was determined by DXA (Hologic QDR 4500W). The protocol on the treadmill started with a warm up at 2.5 and 3 mph with a slope of 0% and 2%. The speed was kept at 3 mph for all the stages and the slope was increased 2% every 2 minutes. Statistical analysis (descriptive, ttest and ANOVAS 2x2x2) was done with SPSS 15.0. Results: Only 35% of the tests were maximal. The equation calculates was Y = 2.6x + 22.3 (x = protocol stage). Data pre and post treatment were not statistically different Discussion: Increments in VO2 were consistent despite subject diversity (sex, % body fat, physical fitness, treatment). Conclusion: To be able to estimate VO2 at the different stages of the test without complex equipment or specialized staff, will facilitate the performance of stress tests on a daily basis. R e s u m e nCorrespondence/correspondencia: Agustín Meléndez-Ortega Facultad de Ciencias de la Actividad Física y del Deporte-INEF. UPM. (España) e-mail: agustin.melendez@upm.es Introducción: El consumo máximo de oxígeno (VO2 max) está asociado con riesgos cardiovasculares y metabólicos pero resulta difícil valorarlo en niños y niñas obesos. El objetivo de este trabajo fue desarrollar una ecuación para estimar su VO2 (mL/kg/min) y comprobar el porcentaje de pruebas máximas según los criterios recomendados. Métodos: Se analizaron las pruebas de esfuerzo de 222 sujetos (94 varones y 128 mujeres con un IMC superior al percentil 85 para su edad y sexo), y las repetidas a los 4 meses. Su edad era 9,4 + 1,1 años y pesaban 52,4 + 13,3 kg. El % de grasa corporal (40,5 + 6,2) se determinó mediante DXA (Hologic QDR 4500W). El protocolo del tapiz rodante comenzó calentando a 4,02 km/h y a 4,83 km/h con pendientes del 0% y 2%. La velocidad se mantuvo a 4,83 km/h en los estadíos de la prueba incrementando la pendiente un 2% cada 2 minutos. El análisis estadístico (descriptivo, t-tests y ANOVAS 2x2x2) se realizó con SPSS 15.0. Resultados: Sólo 35% de las pruebas resultaron máximas. La ecuación resultante fu...

Comparison of cardiorespiratory fitness between preschool children with normal and excess body adipose ~ An observational study

“…This finding was contradictory to studies in school children and adolescents, which proved that those with excess body adipose had significantly lower peak maximal oxygen consumption or peak MET[43, 44]. Indeed, to carry out determinations of VO 2 max in children (not to mention preschool children and children with excess body adipose), is difficult due to many different factors, like lack of physical fitness and motivation, uncomfortable while using mask to collect samples of expired air and so on[45]. Therefore, many studies comparing the results of incremental CPET and supramaximal constant load verification CPET have been conducted, though with controversial conclusions[46].…”

Reduced Cardiorespiratory Capacity in Children with Autism Spectrum Disorders

“…Children who completed at least 3 out of the 4 following criteria during protocol test were considered to have achieved a maximal VO 2 test and reached their VO 2peak : (a) maximal heart rate >90% of predicted HR peak ; (b) respiratory quotient of ≥1.01; (c) achievement of an oxygen plateau (defined as a ≤2.0 mL/kg per min change in oxygen uptake during the last minute of test); (d) incapacity to follow the treadmill speed despite verbal encouragements [ 6 , 13 ]. In addition to these cardiorespiratory markers, maximal characteristics of exercise were assessed by blood lactate measure with 20 μL of arterialized blood sampled at a fingertip during the 4th min of recovery.…”

Influência da maturação sexual na aptidão cardiorrespiratória em escolares

“…Em relação à ACR, o presente estudo corrobora o estudo de Meléndez--Ortega et al 24 , ao não identificar diferenças significativas entre os estágios pubertários no sexo masculino e se contrapõe ao estudo de Machado et al 25 , ao afirmarem que, nos meninos, a entrada na puberdade promove uma melhora na ACR, apresentando uma tendência linear crescente. O estudo de Krahenbuhl et al 26 sinalizou que no sexo masculino o VO 2máx relativo permanece estável por toda a infância e adolescência, enquanto que no sexo feminino, diminui ao longo da adolescência.…”