OBJECTIVE. To determine if patients with fibromyalgia syndrome (FMS)
are more susceptible to activity-induced muscle damage than
are healthy subjects.
METHODS. Eleven FMS patients and 10
healthy subjects performed concentric and eccentric exercise
with their dominant and nondominant forearms, respectively.
31P magnetic resonance spectroscopy (to assess inorganic
phosphate [P(i)] and phosphocreatine [PCr]) and dolorimetry
(to assess pain) were performed before and 20 minutes after
exercise and at 4 subsequent 24-hour intervals.
Neither group exhibited increased P(i)/PCr ratios or reduced
dolorimetry scores following the exercise protocols. FMS
patients did display a phosphodiester resonance at a higher
rate than healthy subjects (37% versus 12%), but this was not
related to the exercise.
CONCLUSION. Unchanged P(i)/PCr ratios
and dolorimetry scores following acute exercise provide
evidence against the hypothesis that FMS patients are more
susceptible to activity-induced muscle damage than are healthy
subjects, although P(i)/Pcr and pain may not adequately
document such damage. The frequent occurrence of
phosphodiester in the spectra of FMS patients may indicate a
sarcolemmal abnormality in these subjects.
MCM: The phosphodiester (PDE) peak found much more often in FM
pts is usually contributed mainly by
glycerol-3-phosphorylcholine (GPC).This compound is produced
by the action of phospholipases on phospholipids, possibly
indicating a mechanism of muscle fiber damage.
Jubrias SA, Bennett RM, Klug GA