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¿La activación cardíaca excesiva inducida por el ejercicio al inicio del ejercicio genera de forma independiente
Abigail K Zedic1, Stuart P S Mladen1, Stacey P A Forbes1
1School of Kinesiology and Health Studies Queen's University, Kingston, Ontario, Canada, K7L 3N6.
Journal of applied physiology (Bethesda, Md. : 1985)
|January 30, 2026
Resumen
La activación cardíaca excesiva (ECA) aumenta el flujo sanguíneo y el gasto cardíaco al inicio del ejercicio. Esta respuesta cardiovascular mejorada aumenta la perfusión de las piernas en ejercicio sin alterar la vasodilatación durante el ejercicio de extensión de rodilla.
Área de la Ciencia:
- Fisiología del Ejercicio
- Fisiología Cardiovascular
- Sistema Nervioso Autónomo
Sus antecedentes:
- La respuesta del sistema cardiovascular al inicio del ejercicio es crucial para satisfacer las demandas metabólicas.
- Es esencial comprender el papel del control cardíaco autónomo en la modulación de la hemodinámica del ejercicio.
Objetivo del estudio:
- Probar la hipótesis de que la activación cardíaca excesiva (ECA) aumenta el flujo del circuito cardiovascular al inicio del ejercicio.
- Investigar los efectos hemodinámicos de la ECA durante el ejercicio de extensión de rodilla con una sola pierna.
Principales métodos:
- 30 participantes realizaron 30 segundos de ejercicio de extensión de rodilla con una sola pierna en condiciones de control (CON) y de activación cardíaca excesiva (ECA).
- La ECA implicó el ejercicio simultáneo de la pierna derecha y una pierna izquierda ocluida para aumentar el impulso cardíaco.
- Se midieron la hemodinámica central y periférica, incluida la frecuencia cardíaca, el gasto cardíaco (Q̇), la presión arterial media y el flujo sanguíneo de las piernas (LBF), utilizando fotopletismografía y ultrasonido Doppler.
Principales resultados:
- La ECA aumentó significativamente la activación cardíaca (Δ frecuencia cardíaca) y el gasto cardíaco (Δ Q̇) en comparación con el CON.
- La presión arterial media y la conductancia vascular total se elevaron durante la ECA.
- El flujo sanguíneo de las piernas en ejercicio (Δ LBF) fue mayor en la ECA, pero la conductancia vascular de las piernas no difirió entre las condiciones.
Conclusiones:
- La activación cardíaca excesiva inducida por el ejercicio mejora el gasto cardíaco y la perfusión de las piernas en ejercicio al inicio del ejercicio.
- Este efecto ocurre sin un mayor aumento en la vasodilatación de las piernas en ejercicio durante el ejercicio de extensión de rodilla submaximal.
- El control cardíaco autónomo juega un papel importante en la modulación de la respuesta cardiovascular inicial al ejercicio.
Palabras clave:
activación cardíacagasto cardíacocontrol cardiovascularejercicio dinámicoflujo sanguíneo de las piernasMás Videos Relacionados
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