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Updated: Jun 25, 2026

Tissue Triage and Freezing for Models of Skeletal Muscle Disease

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Published on: July 15, 2014

Metabolic myopathies: update 2009.

Brian A van Adel¹, Mark A Tarnopolsky

¹Department of Neurology, McMaster University, ON, Canada.

Journal of Clinical Neuromuscular Disease

|March 5, 2009

Summary

Metabolic myopathies are genetic disorders affecting muscle energy production. Early diagnosis and intervention are crucial for managing symptoms and preventing severe complications like rhabdomyolysis.

Area of Science:

Neurology
Genetics
Metabolic Disorders

Background:

Metabolic myopathies are inborn errors of metabolism impacting muscle energy production.
Key categories include defects in glycogen, lipid, and mitochondrial metabolism, with fatty acid oxidation defects (FAOD) and glycogen storage diseases being prominent.
Clinical presentations vary by age, from infantile hypotonia to exercise intolerance and muscle weakness in later life.

Purpose of the Study:

To review the clinical features, diagnostic approaches, and management strategies for common metabolic myopathies.
To emphasize mitochondrial myopathies within the broader spectrum of these disorders.

Main Methods:

Diagnostic evaluation involves exercise stress testing, biochemical assays (creatine kinase, lactate), urine organic acid analysis, muscle biopsy, neuroimaging, and genetic testing.

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Prenatal screening for certain FAODs is available using advanced mass spectrometry techniques.

Main Results:

Glycogen storage diseases typically cause high-intensity exercise intolerance.
FAODs and mitochondrial myopathies often manifest during endurance activities or metabolic stress.
Early identification enables lifestyle modifications, nutritional support, and cofactor treatments to mitigate disease progression.

Conclusions:

Prompt diagnosis of metabolic myopathies is vital for preventing muscle weakness and life-threatening complications.
Management strategies focus on lifestyle, nutrition, and specific treatments to improve patient outcomes.
Mitochondrial myopathies represent a significant group requiring focused attention in diagnosis and care.