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2007, Número 4

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Rev Hosp Jua Mex 2007; 74 (4)


Determinación de la cinética de la fase dos transitoria de la VO2 durante ejercicio de carga constante de intensidades moderada e intensa en hombres jóvenes

Padilla PJ, Kowalchuk JM, Taylor AW, Paterson DH

Idioma: Español
Referencias bibliográficas: 44
Paginas: 231-244
Archivo PDF: 333.47 Kb.


RESUMEN

Se evaluó el análisis de la respuesta transitoria (RT) de la fase dos de la captación pulmonar de O2 (Φ2 VO2) durante ejercicio (E) de carga constante de intensidad moderada (MOD) y alta (ALTA), en voluntarios jóvenes masculinos sanos (VMS) (n = 8; media ± DE: 25 ± 3 años). Los voluntarios completaron inicialmente una prueba de rampa (25 W min-1) hasta el esfuerzo máximo para determinar el umbral ventilatorio (VET) e intensidades de trabajo correspondientes a 80%VET (MOD) y 120%VET (ALTA). Se seleccionó tambien una intensidad de trabajo de 50 W (MOD). Transiciones de un paso de las intensidades de trabajo (4 a 6.6 min de duración) fueron iniciadas desde una línea de base de 15 W sin advertir al voluntario. VO2 se midió de respiración por respiración en la línea de base y a través de cada transición fue filtrado, interpolado a intervalos de 1 s y en promedio ensamblado para obtener un perfil de respuesta único (PRU) para cada voluntario e intensidad. El PRU de cada voluntario fue ajustado con modelos matemáticos exponenciales (MMEs) de uno (1C), dos (2C), y tres (3C) componentes por medio de diferentes ventanas de ajuste (→), y los parámetros estimados (constante de tiempo, T) de cada componente fueron determinados. El mejor ajuste (MA) de MME fue identificado con la prueba de Fisher y/o el significado fisiológico de sus parámetros. Los MA fueron 1C,4Parámetros 0.3333 min → 3 min para intra Φ2 VO2 MOD y ALTA (T2 = 25 ± 8 s); 2C,7PLíne de Base_Inicio → Fin Ejercicio para MOD (T2 = 26 ± 11 s) y 3C,10PLíne de Base_Inicio → Fin Ejercicio para ALTA (T2 = 28 Φ 10 s) Φ2Aislada VO2 (T2General = 25.6 ± 13 s). Los MMEs_MA fueron aquellos que aislaron la cinética (T2) Φ2 VO2 del E submáximo en VMS.


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