What is the opposite of valsalva maneuver?

The opposite of the Valsalva maneuver is the Mueller maneuver.

The Valsalva maneuver is a forced exhalation against a closed glottis, which increases intrathoracic pressure and decreases venous return to the heart. This can cause a temporary drop in blood pressure and heart rate.

The Mueller maneuver is a forced inspiration against a closed glottis, which decreases intrathoracic pressure and increases venous return to the heart. This can cause a temporary increase in blood pressure and heart rate.