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2014, Número 2

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Rev Hosp Jua Mex 2014; 81 (2)


Comparison of modeling techniques used to characterize moderate and heavy phase two recovery Vo2 kinetics in old men

Padilla-Pérez J

Idioma: Español
Referencias bibliográficas: 34
Paginas: 92-103
Archivo PDF: 272.69 Kb.


RESUMEN

Se evaluó la cinética de absorción pulmonar de oxígeno (VO2) off-transitoria (recuperación del ejercicio) de las respuestas de intensidades moderada (M) e intensa (H) al ejercicio submáximo (Sub = M + H) al comparar entre varias estrategias de modelado comunes para evaluar el mejor modelo de ajuste exponencial. El parámetro estimado de la fase 2 de VO2 fue la constante de tiempo (off-τΦ2VO2) en hombres adultos mayores [n = 9; 72 (± 4) años; media (± sd)]. Una prueba tipo rampa (12 W•min-1) hasta el límite de tolerancia para determinar el VO2pico y el umbral estimado de lactato (VET). Ejercicio de ciclo de carga constante a 50 W (M) y a tasas de trabajo correspondientes a 80%VET (M) y a 120%VET (H). Cada una duró 6 min precedidos una línea de base (LB) de 6 min de ciclismo de 20 W, se repitió cuatro a seis veces. VO2 se midió de respiración a respiración. Pedaleando a 60 rpm, la prueba inició con una LB del último minuto del final del ejercicio, seguido de una disminución de potencia (sin advertir al sujeto) de vuelta al pedaleo sin resistencia por 6 min de recuperación (RE). Datos de cada transición se filtraron, interpolaron a intervalos de 1 s y su ensamblado promedio produjo una respuesta única para cada sujeto e intensidad. Las respuestas se modelaron con regresión no lineal y modelos exponenciales de uno (1C), dos (2C) y tres (3C) componentes (tiempo de retraso) de ventanas de ajuste diferente. Off-Φ2VO2 Sub fue fisiológica y estadísticamente bien descrita, y cinéticamente distinguida (off-τ2VO2) por las funciones de doble exponencial dos componentes (2C) para M (aτ2 = 56 ± 14 s) y triple exponencial tres componentes (3C) (bτ2 = 39 ± 7, agbP‹0.05) para H en hombres adultos mayores.


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