Glycogen Storage Disease Type V

Glycogen storage disease type V (GSD5, GSD-V), also known as McArdle’s disease, is a metabolic disorder, more specifically a muscle glycogen storage disease, caused by a deficiency of myophosphorylase. Its incidence is reported as one in 100,000, roughly the same as glycogen storage disease type I.The disease was first reported in 1951 by Dr. Brian McArdle of Guy’s Hospital, London.