which valsalva phase increases cardiac parasympathetic tone?

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Is it the valsalva maneuver straining phase or the relaxing phase that increases cardiac parasympathetic tone?

what i know:
straining phase - decreases venous return/ventricular volume, increased thoracic/ central venous pressure

release phase - increases venous return/ ventricular volume, decreased thoracic/central venous pressure

confusion:
logic would say that it's the release phase that increases pressure because of increased volume flowing through/stretching baroreceoptors

then that means when we use valsalva to help with paroxymal supraventricular tachycardia, we are really getting the decreased vagal tone benefit from the valsalva release phase and NOT the straining phase. and somewhat the neural magic (solitary nucleus) of the release phase overpowers the previous neural magic of the straining phase (with the decreased VR business).

Right?

 

[Jabbed]

Is it the valsalva maneuver straining phase or the relaxing phase that increases cardiac parasympathetic tone?

what i know:
straining phase - decreases venous return/ventricular volume, increased thoracic/ central venous pressure

release phase - increases venous return/ ventricular volume, decreased thoracic/central venous pressure

confusion:
logic would say that it's the release phase that increases pressure because of increased volume flowing through/stretching baroreceoptors

then that means when we use valsalva to help with paroxymal supraventricular tachycardia, we are really getting the decreased vagal tone benefit from the valsalva release phase and NOT the straining phase. and somewhat the neural magic (solitary nucleus) of the release phase overpowers the previous neural magic of the straining phase (with the decreased VR business).

Right?

Phase II (straining) is used for diagnosing murmurs
Phase IV (release) is used for breaking SVT

Phase I and III are not clinically significant, although they do have paradoxical effects as well.

 

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lifesaver! thanks