In general lung volumes and capacities change very little with training. Vital capacity (the amount of air that can be breathed out after maximal inspiration) increases slightly. Tidal volume (the amount breathed out each breath) is unchanged at rest but shows some increases at maximal exercise.
After training breathing rate at rest may be slightly lowered as a result of increased efficiency of the lung but it can be increased at maximal exercise. Minute volume (the amount breathed out in one minute) can increase dramatically during maximal work from 120 Lt/min up to about 150 Lt/min following training. This is a result of increased tidal volume and breathing rate.
The muscles of respiration can increase their strength following training (diaphragm & intercostal muscles).