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Biology 2014, 3(1), 157-166; doi:10.3390/biology3010157
Review

McArdle Disease and Exercise Physiology

Received: 5 February 2014 / Revised: 19 February 2014 / Accepted: 20 February 2014 / Published: 25 February 2014
(This article belongs to the Special Issue Muscle Structure and Function)
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Abstract

McArdle disease (glycogen storage disease Type V; MD) is a metabolic myopathy caused by a deficiency in muscle glycogen phosphorylase. Since muscle glycogen is an important fuel for muscle during exercise, this inborn error of metabolism provides a model for understanding the role of glycogen in muscle function and the compensatory adaptations that occur in response to impaired glycogenolysis. Patients with MD have exercise intolerance with symptoms including premature fatigue, myalgia, and/or muscle cramps. Despite this, MD patients are able to perform prolonged exercise as a result of the “second wind” phenomenon, owing to the improved delivery of extra-muscular fuels during exercise. The present review will cover what this disease can teach us about exercise physiology, and particularly focuses on the compensatory pathways for energy delivery to muscle in the absence of glycogenolysis.
Keywords: McArdle disease; skeletal muscle; metabolism McArdle disease; skeletal muscle; metabolism
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kitaoka, Y. McArdle Disease and Exercise Physiology. Biology 2014, 3, 157-166.

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