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Chronic pain and difficulty in relaxing postural muscles in patients with fibromyalgia and chronic whiplash associated disorders
Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Rehabilitation Medicine.
Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Rehabilitation Medicine. Östergötlands Läns Landsting, Centre for Medicine, Pain and Rehabilitation Centre.
Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Rehabilitation Medicine.
Östergötlands Läns Landsting, Centre for Medicine, Pain and Rehabilitation Centre.
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2001 (English)In: Journal of Rheumatology, ISSN 0315-162X, E-ISSN 1499-2752, Vol. 28, no 6, 1361-1368 p.Article in journal (Refereed) Published
Abstract [en]

Objective. To investigate if muscle tension according to the surface electromyogram (EMG) of the shoulder flexors is increased in consecutive patients with fibromyalgia (FM) or chronic whiplash associated disorders (WAD). Methods. A total of 59 consecutive patients with FM (n = 36) or chronic WAD (n = 23) performed 100 maximal isokinetic contractions combined with surface electromyography of the trapezius and infraspinatus. A randomized group of pain-free female (n = 27) subjects served as control group. Peak torque initially (Pti) and absolute and relative peak torque at endurance level (PTe, PTer) were registered as output variables, together with the EMG level of unnecessary muscle tension, i.e., the signal amplitude ratio (SAR). Results. The patient groups had a higher level of unnecessary tension initially and at the endurance level. The patients had lower absolute output (PTi and PTe), but the relative levels (PTer) did not differ comparing all 3 groups. Subjects with FM had significantly higher body mass index (BMI) than the other groups. BMI did not influence the SAR but correlated positively with PTi. Conclusion. The results confirmed earlier findings that groups of patients with chronic pain have increased muscle tension and decreased output during dynamic activity compared to pain-free controls. However, the results indicated there is heterogeneity within groups of patients with the same chronic pain disorder and that not all patients with chronic pain have increased muscle tension.

Place, publisher, year, edition, pages
2001. Vol. 28, no 6, 1361-1368 p.
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Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-27630Local ID: 12366OAI: oai:DiVA.org:liu-27630DiVA: diva2:248182
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2017-12-13

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Elert, JessicaAspegren Kendall, SallyLarsson, BarbroGerdle, Björn

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