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Common procedures used to evaluate the respiratory muscles are maximum inspiratory pressure and maximum expiratory pressure. However, there is little consensus concerning these methods.ommon procedures used to evaluate the respiratory muscles are maximum inspiratory pressure and maximum expiratory pressure. However, there is little consensus concerning these methods.
In order to expand the lungs, the inspiratory muscles must overcome two key factors: 1) compliance of the lungs and 2) airways resistance mainly in the form of frictional resistance to flow of air through the airways (see upcoming lecture on. airway resistance).