Often EIVCD is misdiagnosed as asthma, although it does tend to occur in conjunction with asthma. A few clues that the vocal cords may be involved is the report of throat tightness - usually in asthma it is chest tightness; inspiratory sounds - with asthma it is generally a wheeze on breathing out; and if symptoms do not resolve with taking a bronchodilator (like Ventolin) EIVCD should be suspected. Of note, it is three times more likely to occur in females than males.
So all that being said, where does breathing fit into this? Well, there is some evidence to indicate that the muscles that help open the vocal folds are linked to the movement of the diaphragm. That is, the downward motion of the diaphragm that occurs during inhale assists in the activation of these "throat opening" muscles. In all of the patients I have seen with complaints of EIVCD, they have demonstrated a breathing pattern that relies heavily on the accessory muscles of breathing located in the neck and chest, with very little activation of the diaphragm. We also know there is a link between tight muscles in the neck and tight muscles around the larynx (where the vocal cords are located).
Management of EIVCD generally includes education and breathing retraining. Patients who have an understanding about what is going are less likely to panic when experiencing symptoms. Learning new breathing patterns that help to relax tense neck muscles and activate the diaphragm assist in decreasing the frequency and severity of events. "Rescue breathing" exercises are also taught to help gain control in an acute episode. I also include postural retraining and manual therapy to address neck muscle tension. There is also some evidence showing that low load inspiratory muscle training assists in restoring reflexive opening of the vocal folds. I have certainly noticed clinically an improvement in breathing patterns when adding this modality to my treatment programs.
If you or someone you know has asthma, and struggles during strenuous exercise, take note of your symptoms and compare them to the ones mentioned here. If you are finding it has been hard to manage your symptoms to this point, perhaps you may want to consider if exercise induced vocal cord dysfunction is involved.