This article includes Supplementary Video, available online at

jws-mds.21350.mpg13053K Segment 1. Segment 1 shows Patient IV-7 (M.K.) walking and, respectively, running in the interval between attacks. Segment 2. Segment 2 shows gradual appearance of symptoms of an attack of paroxysmal exercise-induced dystonia after prolonged exercise, with weakness and cramping/bending of both legs, partially also twisting of the ankles and stumbling. During the attack, the patient is unable to properly lift his feet from the ground. This video presentation has been abbreviated. The full version will appear on theMovementDisorders DVD Supplement, which is issued bi-annually.

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.