Abstract
McArdle disease, also known as Glycogenosis Type V, was described for the 1st time in1951 by Brian McArdle. It is caused by deficiency of muscle glycogen phosphorylase (myophosphorylase), an enzyme involved in the process of glycogenolysis. It is the most common glycogen storage disease among 13 existing types, occurring in 1:40,000 individuals. The onset occurs in adolescence and is char…