Pain induced by low-grade stress in FM

Discussion in 'Fibromyalgia Main Forum' started by tansy, Nov 23, 2005.

  1. tansy

    tansy New Member

    Pain induced by low-grade stress in patients with fibromyalgia and chronic
    shoulder/neck pain, relation to surface electromyography.

    Eur J Pain. 2005 Nov 18; [Epub ahead of print]

    Nilsen KB, Westgaard RH, Stovner LJ, Helde G, Ro M, Sand TH.

    Norwegian University of Science and Technology, Department of
    Neurosciences, N-7489 Trondheim, Norway.

    PMID: 16300974


    The mechanisms of pain causation in fibromyalgia (FMS) and chronic
    shoulder/neck pain (SNP) are still debated. We wanted to compare muscle
    activity and pain development during and after low-grade mental stress in
    FMS and SNP patients.

    Twenty-three women with FMS, 29 women with chronic SNP and 35 healthy women
    performed a stressful task lasting 60min followed by a 30min recovery
    period. We recorded surface electromyography over the trapezius, neck,
    temporalis and frontalis muscles. Subjects reported their pain at the
    corresponding locations together with the development of fatigue and
    perceived tension.

    Significant differences between FMS and SNP groups were not observed either
    for muscular or subjective responses. SNP patients and controls responded
    with more pain in the trapezius and neck regions than in the forehead, in
    contrast to FMS patients who had a more generalized pain response.
    Development of pain, tension and fatigue was not related to muscle activity
    for any group.

    We conclude that FMS and SNP patients have similar pain and
    electromyographic responses. The results suggest that similar
    pathophysiological mechanisms are involved although the responses are more
    generalised in FMS than in SNP patients. Muscular activity did not explain
    the pain which developed during the stressful task for either group. Pain
    lasted longer during recovery in both FMS and SNP patients compared to
    healthy controls, possibly a result of disease-related sensitisation in
    pain pathways.