what is valsalva effect
The effect of the Valsalva Maneuver is a drastic increase in the pressure within the thoracic cavity. SIDENOTE. ==========================================. The thoracic cavity is the airtight section inside the chest which houses the lungs and heart. In a Valsalva Maneuver, attempting to exhale with the mouth and nose closed increases the pressure in the thoracic cavity because the air cannot escape. ==========================================. The place where the Valsalva Maneuver is carried out the most is the sitting toilet. It is difficult to evacuate properly on a sitting toilet because the colon is not supported and pressurised. There is also a kink at the rectum and anus which obstructs the flow of waste.