McArdle Disease
McArdle disease, also known as glycogen storage disease type V, is an inherited condition where individuals cannot break down a complex sugar in the body known as glycogen. This disease interferes with normal muscle function and can lead to fatigue, cramps, and muscle pain.
Quick Answer
What it is
McArdle disease, also known as glycogen storage disease type V, is an inherited condition where individuals cannot break down a complex sugar in the body known as glycogen. This disease interferes with normal muscle function and can lead to fatigue, cramps, and muscle pain.
Key findings
- Grade C: Exercise Tolerance (Creatine)
- Grade N/A: Power Output (Creatine)
- Grade N/A: Muscular Dystrophy Symptoms (Creatine)
Safety
No specific caution or interaction language was detected in the current summary/outcome notes.
ℹ️ Quick Facts
Quick Facts: McArdle Disease
- Supplements Studied:1
- Research Trials:2
- Total Participants:392
- Top Supplement:Creatine (B)
Evidence-Based Protocol
Supplement stack ranked by research quality
Primary Stack (Tier 1)
Alternative energy source for muscles; may help improve exercise tolerance and reduce myoglobinuria
Co-factor for muscle glycogen phosphorylase b; may partially compensate for enzyme deficiency
Supporting Stack (Tier 2)
Pre-exercise glucose improves exercise tolerance by providing blood-borne fuel
Alternative fuel source for muscles; may provide energy during exercise
Supports mitochondrial function; may help with muscle energy production
Supports ATP regeneration; may help muscle recovery
Supports fatty acid oxidation; may help muscles use fat for energy
How It Works
McArdle Disease (Glycogen Storage Disease Type V) is a rare inherited muscle disorder caused by deficiency of the enzyme myophosphorylase, which breaks down glycogen (stored sugar) in muscles. Without this enzyme, muscles cannot efficiently convert glycogen to glucose for energy during exercise.
KEY FEATURES:
SYMPTOMS:
THE "SECOND WIND":
A hallmark of McArdle disease - after 6-10 minutes of exercise, symptoms improve as the body switches to alternative fuel sources (blood glucose, fatty acids).
CRITICAL: McArdle disease requires specialist management. This protocol is SUPPORTIVE ONLY.
MANAGEMENT STRATEGIES:
* Creatine may provide alternative energy for muscles (use low doses).
* Pre-exercise glucose/sucrose improves exercise tolerance.
* B6 is a cofactor that may help residual enzyme activity.
Expected timeline: Lifelong condition. Proper management can significantly improve quality of life and exercise tolerance.
Supplements for McArdle Disease
Sorted by strength of evidence
Detailed Outcomes
Research Citations (100)
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