rare paroxysmal movement disorder paroxysmal exercise induced dyskinesia true Paroxysmal exercise induced dyskinesia represents a genetically heterogenous group of conditions in which dystonia or choreoathetosis are triggered by exercise. It may be inherited in an autosomal dominant manner or present as a sporadic case. Attacks may last several minutes to half an hour and more frequently affect the lower than upper limbs. This is one of the many phenotypes associated with glucose transporter 1 (GLUT1) deficiency which is typically caused by mutations in the SLC2A1 gene.