McArdle Syndrome (Glycogen Storage Disease Type V)
Alternate Names : Glycogen Storage Disease Type V, Muscle Phosphorylase Deficiency
Symptoms & Signs
Muscle pain, cramps, and stiffness during exercise are the primary symptoms of McArdle syndrome. Other symptoms include the following:
- Muscle weakness
- Intolerance for exercise
- Exercise can produce a burgundy-colored urine (myoglobinuria)
Symptoms usually do not begin until the affected person has reached adulthood. Avoiding strenuous exercise decreases the severity of these symptoms and of the disease.
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