RESUMO
Cardiorespiratory fitness (CRF) provides oxygen to the exercising muscles and is related to body adiposity, with cardiometabolic variables. The aim was to develop reference values and a predictive model of CRF in Chilean adolescents. A total of 741 adolescents of both genders (15.7 years old) participated in a basic anthropometry, performance in the six-minute walk test (SMWT), and in Course Navette was measured. Percentiles were determined for the SMWT, for the VÌO2max, and an equation was developed to estimate it. The validity of the equation was checked using distribution assumptions and the Bland-Altman diagram. The STATA v.14 program was used (p < 0.05). The 50th percentile values for males and females in the SMWT and in the VÌO2max of Course Navette were, respectively, from 607 to 690 and from 630 to 641 m, and from 43.9 to 45 and from 37.5 to 31.5 mlO2·kg·min-1, for the range of 13 to 17 years. For its part, the model to predict VÌO2max incorporated gender, heart rate, height, waist-to-height ratio (WHR), and distance in the SMWT (R2 = 0.62; estimation error = 0.38 LO2·min-1; p <0.001). Reference values can guide physical fitness in Chilean adolescents, and VÌO2max was possible to predict from morphofunctional variables.
Assuntos
Aptidão Cardiorrespiratória , Adolescente , Chile , Teste de Esforço , Feminino , Humanos , Masculino , Consumo de Oxigênio , Aptidão Física , Teste de CaminhadaRESUMO
El objetivo de esta investigación es obtener una ecuación para determinar VO2 máx. a través de una prueba submáxima utilizando la frecuencia cardíaca de recuperación (FCr). Se diseñó en un estudio descriptivo correlacional dentro de un marco cuantitativo y se evaluó a 18 sujetos, 9 damas y 9 varones, de primero a cuarto año estudiantes de educación física con un muestreo de tipo intencional. Se midió la FCr en la prueba submáxima en escalón de McArdle, utilizando el monitor de FC marca Polar mo-delo V800 (Finlandia), y el consumo máximo de oxígeno (VO2 máx.) en el test de esfuerzo máximo de Bruce con el analizador de gases marca COSMED, modelo Fitmate PRO (Italia). En los resultados, la correlación (coeficiente de Pearson) que se obtuvo fue de r = 0.84 (p<0.001) la cual se encuentra en una categoría considerable, obteniendo la ecuación y = 0.4132 x + 110.68 con un error de estimación estándar (EEE) de 5.8 ml.kg.min1.
The main aim of this research is to obtain an equation to determine the VO2 max through a submaximal test using heart rate recovery (HRr). A correlational descriptive study was designed within a quantitati-ve framework, where 18 subjects, all physical education college students, from freshman to senior year, were evaluated (9 females and 9 males), using diversity sampling (intentional). The HRr was measured in the McArdle submaximal step using the HR monitor, Polar V800 model (Finland), and the VO2 max. in the Bruce maximum effort test was measured with the gas analyzer COSMED model Fitmate PRO (Italy). In the results, the correlation (Pearson coefficient) obtained was r = −0.84 (p<0.001) which is within the considerable category, obtaining the equation y = 0.4132 x + 110.68 with a standard error of estimation (SEE) of 5.8 ml.kg.min−1.
