Paroxysmal exercise-induced dystonia

Paroxysmal exercise-induced dystonia (PED) is a rare neurological disorder that belongs to the paroxysmal dyskinesias, a group of rare movement disorders that involve attacks of hyperkinesia with intact consciousness.^[1] It is characterized by sudden, transient, involuntary movements, often including repetitive twisting motions and painful posturing triggered by exercise or other physical exertion.^[2] The term paroxysmal indicates that the episodes are sudden and short lived and usually unpredicted, and return to normal is rapid.^[2] The number of reported cases of people with PED is very small leading to difficulty in studying and classifying this disease and most studies are limited to a very small number of test subjects.