McArdle Disease (Type V)
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McArdle Disease (Type V)
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What is McArdle Disease? McArdle Disease, also called glycogen storage disease type V (GSD-V), is an inherited disorder caused by an inability to break down glycogen in muscle cells, interfering with the function of muscle cells. People with McArdle Disease typically experience fatigue, muscle pain, and cramps during the first few minutes of exercise (exercise intolerance).