Myophosphorylase deficiency impairs muscle oxidative metabolism

R. G. Haller, S. F. Lewis, J. D. Cook, C. G. Blomqvist

Research output: Contribution to journalArticle

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Abstract

We studied oxidative metabolism during bicycle exercise in 4 patients with myophosphorylase deficiency. Maximal oxygen uptake (V̇O2max) was low (14.0 ± 1.4 ml.kg-1.min-1, mean ± SE) compared with that in normal subjects (37.7 ± 1.9; n=12) and patients with myalgia (24.9 ± 1.8; n=10). Carbohydrate oxidation, as estimated by the respiratory exchange ratio (R), was low relative to workload (max R, mean ± SE: McArdle's disease, 0.96 ± 0.02; normal subjects, 1.13 ± 0.02; myalgia, 1.09 ± 0.02). Intravenous glucose administration increased maximal oxygen uptake about 20% in those with McArdle's disease, but both V̇O2max and R remained lower than in control subjects. These findings suggest that the capacity for dynamic exercise in McArdle's disease is limited by the availability of oxidative substrate, and indicate that blood glucose is unable to substitute fully for muscle glycogen as an oxidative fuel. We also found that exercise cardiac output (Q̇) was excessive relative to oxygen uptake in affected patients (ΔQ̇/ΔV̇O2, mean ± SE: McArdle's disease, 11.6 ± 1.7; normal subjects, 4.8 ± 0.2; myalgia, 5.6 ± 0.2). This hyperkinetic circulation in exercise may serve to increase the delivery of blood-borne oxidative substrate to working muscle.

Original languageEnglish (US)
Pages (from-to)196-199
Number of pages4
JournalAnnals of Neurology
Volume17
Issue number2
StatePublished - 1985

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Glycogen Storage Disease Type V
Myalgia
Muscles
Exercise
Oxygen
Workload
Glycogen
Intravenous Administration
Cardiac Output
Blood Glucose
Carbohydrates
Glucose

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Haller, R. G., Lewis, S. F., Cook, J. D., & Blomqvist, C. G. (1985). Myophosphorylase deficiency impairs muscle oxidative metabolism. Annals of Neurology, 17(2), 196-199.

Myophosphorylase deficiency impairs muscle oxidative metabolism. / Haller, R. G.; Lewis, S. F.; Cook, J. D.; Blomqvist, C. G.

In: Annals of Neurology, Vol. 17, No. 2, 1985, p. 196-199.

Research output: Contribution to journalArticle

Haller, RG, Lewis, SF, Cook, JD & Blomqvist, CG 1985, 'Myophosphorylase deficiency impairs muscle oxidative metabolism', Annals of Neurology, vol. 17, no. 2, pp. 196-199.
Haller, R. G. ; Lewis, S. F. ; Cook, J. D. ; Blomqvist, C. G. / Myophosphorylase deficiency impairs muscle oxidative metabolism. In: Annals of Neurology. 1985 ; Vol. 17, No. 2. pp. 196-199.
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