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Lack of association between fibromyalgia (FM) syndrome & abnormalities in muscle energy metabolism

  [ 72 votes ]   [ Discuss This Article ] • June 3, 1994

OBJECTIVE. To compare parameters of muscle energy metabolism
in patients with fibromyalgia syndrome (FMS) and sedentary

METHODS. Thirteen female FMS patients and 13 female
sedentary controls underwent a standardized clinical
assessment (including dolorimeter measurements of the upper
trapezius and tibialis anterior muscles) and a standardized
aerobic fitness test including measurement of maximum oxygen
uptake (VO2max). Phosphorus (31P) magnetic resonance
spectroscopy studies of the upper trapezius and tibialis
anterior muscles were then performed in FMS patients and
controls, at rest and during and following a muscle-fatiguing
exercise protocol.

RESULTS. FMS patients and controls had
similar levels of VO2max and of maximum voluntary contraction
(MVC) of the upper trapezius and tibialis anterior muscles.
After controlling for VO2max and MVC, measurements of
phosphocreatine (PCr), inorganic phosphate (P(i)), and
intracellular pH in these muscles were not significantly
different in FMS patients versus sedentary controls either at
rest, during exercise, or during recovery. In the patients
with FMS, no correlation was found between overall or local
pain severity and the principal muscle metabolic parameter,
PCr/P(i). Inverse correlations between dolorimeter scores at 2
muscle sites and tibialis anterior PCr/P(i) were found both in
patients and in controls.

CONCLUSION. This study demonstrates
that under the conditions studied, muscle energy metabolism in
FMS is no different than that in sedentary controls. These
findings do not support the hypothesis that detectable defects
in muscle energy metabolism occur in FMS.

Simms RW, Roy SH, Hrovat M, Anderson JJ, Skrinar G, LePoole SR,
Zerbini CA, de Luca C, Jolesz F

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