Exercise-induced Vocal Cord Dysfunction, or Paradoxical Vocal Cord Motion, is the condition whereby strenuous exercise causes the vocal cords to close rather than open when the athlete is trying to inhale, and in some cases, the cords also close on exhalation as well.

It is often mistaken for exercise-induced asthma, but spirometric testing usually can rule out asthma if it is not concurrent with the VCD.

There can be an audible noise made at times when the athlete is trying to inhale and the cords are closed.

If VCD is also present on exhale, this can sometimes be shown with a peak flow meter or with spirometry. 

VCD does not respond to asthma medications.

Exercise-induced VCD usually subsides quickly when the athlete stops any physical exertion.