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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.
Inspiratory Reserve Volume (IRV): Total lung capacity minus the volume of air in the lung at the end of a normal inspiration. This means that we have a reserve volume that we can tap into as tidal volume increases with exercise or activity.