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Efecto en la capacitación sobre el equilibrio entre la oferta y la demanda de oxígeno miocárdico
Circulation
|August 1, 1977
Resumen
El entrenamiento de resistencia mejora el suministro de oxígeno del corazón y el equilibrio de la demanda. Esto mejora la capacidad de trabajo y reduce el riesgo de isquemia miocárdica durante el ejercicio.
Área de la Ciencia:
- Cardiología Cardiología.
- Medicina del Deporte Medicina del Deporte Medicina de los Deportes
- Fisiología Fisiología Fisiología.
Sus antecedentes:
- La evaluación de la oferta y demanda de oxígeno del miocardio es crucial para comprender la salud cardíaca.
- Se sabe que el entrenamiento de resistencia mejora la función cardiovascular, pero sus efectos específicos en el equilibrio de oxígeno miocárdico requieren una investigación detallada.
Objetivo del estudio:
- Evaluar el impacto del acondicionamiento de resistencia en el equilibrio entre la oferta y la demanda de oxígeno miocárdico.
- Para comparar estos efectos en individuos bien entrenados versus controles sedentarios.
Principales métodos:
- Utilizó el índice de tiempo de presión diastólica (DPTI) para estimar el suministro sanguíneo subendocárdico.
- Empleó el índice de tiempo de tensión (TTI) para cuantificar las demandas de oxígeno miocárdico.
- DPTI y TTI medidos durante una prueba de cinta de correr progresiva en sujetos entrenados y sedentarios.
- Calculó la relación DPTI/TTI para evaluar el equilibrio entre la oferta y la demanda de oxígeno en el miocardio.
Principales resultados:
- Los sujetos entrenados exhibieron una relación DPTI / TTI significativamente mayor en reposo y cargas de trabajo submáximas en comparación con los controles.
- En la carga de trabajo máxima para los controles, los sujetos entrenados tenían un TTI más bajo y un DPTI más alto, lo que resultó en una relación DPTI / TTI significativamente mejorada.
- Ambos grupos lograron un equilibrio similar entre la oferta y la demanda a ritmos cardíacos casi máximos, pero los sujetos entrenados estaban en cargas de trabajo más altas.
Conclusiones:
- El acondicionamiento de resistencia mejora el suministro de oxígeno del miocardio y el equilibrio de demanda en cargas de trabajo submáximas.
- El entrenamiento aumenta la capacidad de ejercicio y reduce la demanda de oxígeno del miocardio, reduciendo así el riesgo de isquemia cardíaca.
- Un mejor equilibrio entre la oferta y la demanda de oxígeno en individuos entrenados apoya una mayor capacidad de trabajo y eficiencia cardíaca.
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