Did all the spirogram values return to normal? Why do you think some values did not return all the way to normal? The values that returned to normal were TV, ERV, FEV1 %. The smooth muscles in the bronchioles didn't return to normal plus mucus still blocks the airway.

Why did TLC not change for any of the experimental participants?

TLC is a fixed volume which means it cannot change with exercise.

What happened to the FEV as the radius of the airways decreased How well did the results compare with your prediction?

How well did the results compare with your prediction? As the radius of the airways decreases, the FEV1 also decreases. ... The values that changed were ERV, IRV, RV, FVC, and FEV1. These all changed because of a loss of elastic recoil in the lungs.