Rheumatology Medical News about fibromyalgia; central motor control failure, surface electromyography

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Central motor control failure in fibromyalgia: A surface electromyography study
BMC Musculoskeletal Disorders, 07/13/09

Casale R et al. – Fewer myoelectrical manifestations of fatigue in fibromyalgia (FM) is the electrophysiological expression of muscle remodelling in terms of the prevalence of slow conducting fatigue-resistant type I fibres, probably more related to central motor control failure than muscle membrane alterations, which suggests pathological muscle fibre remodelling related to altered suprasegmental control.

Methods

An assessment of whether the myoelectrical manifestations of fatigue in FM pts are central or peripheral in origin
8 female pts aged 55.6+/-13.6 yrs (FM group) and 8 healthy female volunteers aged 50.3+/-9.3 yrs (MCG)
Subjects were studied by means of non-invasive surface electromyography with 16 electrodes placed on the skin overlying the biceps brachii muscle, with electrically elicited contractions
To assess whether there were any significant differences between the 2 groups and contraction types:
- Maximal voluntary contractions (MVCs)
- Motor unit action potential conduction velocity distributions, and
- Mean power frequency of the spectrum (MNF)
  were estimated

Results

Motor pattern of recruitment during voluntary contractions was altered in FM pts, who also showed fewer myoelectrical manifestations of fatigue
Mean conduction velocity distribution and skewnesses values were higher in FM group
There were no between-group differences in the results obtained from the electrically elicited contractions

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