Benito PJ, Calderón FJ, Peinado AB, Lorenzo I, Díaz V

Idioma: Español
Referencias bibliográficas: 32
Paginas: 297-302
Archivo PDF: 119.23 Kb.

RESUMEN

Introducción. Pocos trabajos han abordado el estudio de la relación volumen corriente/tiempo inspiratorio (V_T/t_I) durante esfuerzos prolongados a intensidad constante en cinta rodante. Objetivo. Analizar la relación V_T/t_I a una intensidad correspondiente al punto medio entre los dos umbrales ventilatorios. Material y métodos. Veinticuatro varones han participado en el estudio, realizando dos pruebas en tapiz: 1) Prueba máxima incremental y 2) prueba de carga constante con intensidad correspondiente al punto medio entre los dos umbrales ventilatorios y 30 minutos de duración. Durante la prueba a carga constante se determinaron los parámetros de intercambio respiratorio, así como la concentración de lactato y parámetros ácido-base. Resultados. El punto medio de ruptura de la relación V_T/t_Idurante la prueba máxima se alcanzaba a V_T de 2,886 (465) mL, t_I de 0.57 (0.10) s y consumo de oxígeno (VO₂) de 4,606 (532.9) mL/min. Durante el esfuerzo a carga constante las relaciones V_T/t_I y t_I/t_TOT (tiempo inspiratorio/tiempo total) fueron significativamente inferiores a las correspondientes al punto de ruptura de Hering-Breuer (PHB). A pesar de que la concentración de lactato fue superior a 4 mmol/L, los parámetros del estado ácido base se mantuvieron dentro de unos límites que permitieron finalizar toda la prueba. Conclusiones. Durante un esfuerzo de 30 minutos a una intensidad correspondiente al punto medio entre los dos umbrales ventilatorios, se adopta un valor de la relación V_T/t_I por debajo del PHB determinado durante una prueba máxima. Tanto los valores de presión al final de la espiración de dióxido de carbono (Pet CO₂) como del estado ácido-base se mantienen estables y por debajo de los valores correspondientes al PHB.

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