Inspiratory reserve volume (IRV)

Definition

Inspiratory Reserve Volume is the additional amount of air that can be inhaled with maximum effort after a normal inhalation. It represents the reserve capacity of the lungs beyond the regular tidal volume.

Related terms

Tidal Volume: The amount of air inhaled or exhaled during normal breathing with each breath.

Expiratory Reserve Volume (ERV): The maximum amount of air that can be forcibly exhaled after completing a normal, quiet respiratory cycle.

Vital Capacity (VC): The total amount of air that can be expelled from the lungs after taking the deepest breath possible, which includes tidal volume plus inspiratory and expiratory reserve volumes