Pain characteristics, muscle function and impact on daily activities
were studied in 39 women with chronic regional muscular pain
(RMP). They were all blue-collar workers in work involving
precise manipulations. The main location of the pain was in
the neck-shoulder region. Nineteen age-matched women with
fibromyalgia (FM) were studied in the same way as the RMP
patients. Thirty-seven women with no pain and with the same
age and weight as the RMP patients served as reference group
with respect to muscle strength and endurance.
study was done with respect to pain distribution and other
pain characteristics 20 months after the initial examination.
The findings were of the same nature in the RMP and the FM
groups. The intensity of pain, the lowering of pain threshold
for pressure, and the degree of sleep disturbance were
greater in the FM than in the RMP group. Isometric muscle
strength and static muscular endurance were reduced in both
FM and RMP compared to reference values. The reduction in
strength and endurance was greater in FM than in RMP. Even if
the impact on everyday activities were greater in FM than in
RMP, the impact was substantial in RMP patients also, for
example with regard to work capacity. There were no
transitions from RMP to FM during the 20 months to follow-up.
Three FM patients, however, did not meet the ACR criteria for
FM at follow-up.
Henriksson KG, Backman E, Henriksson C, de Laval JH