Association of fibromyalgia with altered skeletal muscle characteristics which may contribute to postexertional fatigue in postmenopausal women - PubMed
Peripheral mechanisms, i.e., altered muscle fiber size distribution and decreased capillary density, may contribute to postexertional fatigue in FM. Understanding of these defects in fibromyalgic muscle may provide valuable insight with regard to treatment.
greater variability in fiber size and altered fiber size distribution
capillary density was lower in the FM group
However, self-reported fatigue and pain were correlated with prolonged loss of strength following 12 minutes of recovery in patients with FM.