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Case Reports
. 2001 May;8(3):286-7.
doi: 10.1054/jocn.1999.0230.

Adult-onset exercise intolerance due to phosphorylase b kinase deficiency

H Bak  1 , D Cordato, W F Carey, D Milder
Affiliations
Case Reports

Adult-onset exercise intolerance due to phosphorylase b kinase deficiency

H Bak et al. J Clin Neurosci. 2001 May.

Abstract

Muscle-specific phosphorylase b kinase deficiency is an unusual form of glycogen storage disorder. The majority of patients are male with an age at diagnosis between 15 to 36 years. Clinical features include exercise intolerance, myalgia and muscle weakness. A forearm ischaemic exercise test is usually normal and histochemical staining for myophosphorylase positive. The demonstration of reduced muscle phosphorylase b kinase activity by biochemical assay confirms the diagnosis. We report a 36 year old male with phosphorylase b kinase deficiency and symptom onset in adult life.

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