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2008, Número 3

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Rev Hosp Jua Mex 2008; 75 (3)


Phase two on-transient VO2 kinetics is slow age-related during submaximal exercise in adult men

Padilla J, Kowalchuk JM, Taylor AW, Paterson DH

Idioma: Ingles.
Referencias bibliográficas: 64
Paginas: 166-182
Archivo PDF: 602.55 Kb.


RESUMEN

Introducción. La cantidad y curso temporal del consumo muscular de oxígeno (VO2M) se refleja en su captación pulmonar (VO2, mL•min), en términos de tres fases de una respuesta transitoria al ejercicio; la cardio dinámica (Φ1VO2), el estado estable del ejercicio o el componente lento (Φ3VO2) y la que refleja (Φ2VO2) la VO2M. La respuesta cinética transitoria de la Φ2VO2 (ԏ, constante de tiempo, s) sigue siendo importantísima en la investigación detallada de la VO2M y del grado de entropía de la Φ2VO2 ԏ de un sistema vivo (S Φ2 VO2 ԏ , cal•ºC-1•s). Material y métodos. Ocho jóvenes (YG = 25 ± 3 años; media ± DE) y nueve adultos mayores (OG = 71 ± 5) masculinos, hicieron una prueba rampa de ejercicio de ciclismo de piernas (YG: 25W•min-1; OG: 15W•min-1). Cada uno completó de 4 8 repeticiones de ejercicio de ciclismo de piernas a base de uno de intensidad moderada absoluta (50W) y dos relativos al umbral láctico estimado (θL; moderado: 80%θL, intenso: 120%θL) (submáximo = moderado + intenso) con duración de 6 min cada uno. Comparamos Φ2 VO2 ԏ de YG y OG, del modelado con regresión no lineal de datos de VO2 respiración por respiración, mediante aislamiento fisiológico previo de la Φ2 VO2 ajustada (ventana modelada: desde una Línea Basal_Inicio al Final ejercicio) con modelos exponenciales de dos y tres componentes para el moderado y intenso respectivamente. El relativo fue determinado de la prueba rampa para poner al mismo nivel energético de ejercicio a las personas. Resultados. Observamos la respuesta característica de cinética lenta de la Φ2 VO2 del ejercicio de adultos mayores comparados con jóvenes (ԏ2: OG › YG), no sólo para el relativo (moderado: 62 ± 16 › 28 ± 10 e intenso: 40 ± 7 16 › 26 ± 10), sino también para el absoluto (52 ± 13 › 23 ± 12) (submáximo: 51.3 ± 15.1 › 25.7 ± 10.3), así como para la S Φ2 VO2 ԏ (x10-3) de cada uno de ellos (Sԏ2absoluto: 14 ± 1 › 11 ± 2; Sԏ2moderado relativo: 15 ± 1 › 12 ± 1, Sԏ2intenso: 13 ± 1 › 12 ± 2 y Sτ2submaximo: 14 ± 1 › 12 ± 2). La cinética lenta de la Φ2 VO2 y su entropía aumentada se relacionaron con la edad, tanto para las pruebas de carga constante del mismo nivel energético (relativo: moderado e intenso) como absoluta moderada.


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