It is an easy, painless test that allows us to measure the maximum inspiratory pressure (MIP) and maximum expiratory pressure (MEP), generated by the inspiratory and expiratory muscles during a maximal breathing effort respectively.

The test contributes in the diagnosis of neuromuscular disease cases where their values are characteristically reduced.

MIP: is the lowest, most negative pressure developed during a maximal inspiratory effort performed through a closed airway (a shutter is briefly activated during the measurement).

MEP: is the highest positive pressure achieved during a maximal expiratory effort performed through a closed airway (a shutter is briefly activated during the measurement).