Muscle Performance, Electromyography and Fibre Type Composition in Fibromyalgia and Work-related Myalgia

Elert, Jessica; Rantapää-dahlqvist, S. B.; Henriksson-Larsén, Karin; Lorentzon, Ronny; Gerdle, Björn

doi:10.3109/03009749209095059

Cited by 143 publications

(102 citation statements)

References 22 publications

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“…It is therefore possible that pain impairs proprioception, which will lead to less precise motor control and possibly as a compensatory reaction, to an increased effort mainly in the form of increased coactivation of muscles. Increased muscle activation and especially a lack of relaxation as shown in patients with UEMDs [28,73] and whiplash associated disorders [103], and increased pen pressure during a graphical aiming task in patients with a-specific forearm pain [13] support this assumption.…”

Section: Feedback Loops From Muscle Disorder To Muscle Activitysupporting

confidence: 58%

Erratum to “Pathophysiology of upper extremity muscle disorders” [Journal of Electromyography and Kinesiology 16 (2006) 1–16]

Visser

Dieën

2006

Journal of Electromyography and Kinesiology

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A review of the literature on the pathophysiology of upper extremity muscle disorders (UEMDs) was performed. An overview is given of clinical findings and hypotheses on the pathogenesis of UEMDs. The literature indicates that disorders of muscle cells and limitations of the local circulation underlie UEMDs. However, these disorders identified do not necessarily lead to symptoms. The following mechanisms have been proposed in the literature: (1) selective recruitment and overloading of type I (Cinderella) motor units; (2) intra-cellular Ca 2+ accumulation; (3) impaired blood flow; (3b) reperfusion injury; (3.3c) blood vessel-nociceptor interaction; (4a) myofascial force transmission; (4b) intramuscular shear forces; (5) trigger points; (6) impaired heat shock response. The results of the review indicate that there are multiple possible mechanisms, but none of the hypotheses forms a complete explanation and is sufficiently supported by empirical data. Overall, the literature indicates that: (1) sustained muscle activity, especially of type I motor units, may be a primary cause of UEMDs; (2) in UEMDs skeletal muscle may show changes in morphology, blood flow, and muscle activity; (3) accumulation of Ca 2+ in the sarcoplasm may be the cause of muscle cell damage; (4) it seems plausible that suboptimal blood flow plays a role in pathogenesis of UEMDs; (5) since the presence of fiber disorders is not a sufficient condition for the development of UEMSDs additional mechanisms, such as sensitization, are assumed to play a role.

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Section: Feedback Loops From Muscle Disorder To Muscle Activitysupporting

confidence: 58%

Erratum to “Pathophysiology of upper extremity muscle disorders” [Journal of Electromyography and Kinesiology 16 (2006) 1–16]

Visser

Dieën

2006

Journal of Electromyography and Kinesiology

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“…Thus general motor-control factors may be of significance. Such factors could be overstabilization of the shoulder (32,33), contralateral coactivation (34), and decreased ability to relax (35).…”

Section: Discussionmentioning

confidence: 99%

Interindividual variation of physical load in a work task

Balogh¹,

Hansson²,

Ohlsson³

et al. 1999

Scand J Work Environ Health

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“…The crosssectional area of the quadriceps femoris muscle has been reported to be within normal ranges in persons with FM (5,6). However, some studies have shown that maximal isometric and dynamic muscle strength in short tests (1)(2)(3)(4)(5) repetitions) is lower in persons with FM than in healthy individuals (1,5,7,8); however, these reports have been contradicted in the longer tests that are more related to resistance (9,10). The reduced maximal muscle strength of knee extensors has been associated with lower outcomes in functional tests related to daily living (sit up and sit down on a chair, walking) in persons with FM (11) and with the increase of disability, especially in females with rheumatoid arthritis (12).…”

Section: Introductionmentioning

confidence: 99%

Exercise in waist‐high warm water decreases pain and improves health‐related quality of life and strength in the lower extremities in women with fibromyalgia

Gusi¹,

Tomás-Carús²,

Häkkinen³

et al. 2006

Arthritis & Rheumatism

138

105

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Objective. To evaluate the short-and long-term efficacy of exercise therapy in a warm, waist-high pool in women with fibromyalgia. Methods. Thirty-four women (mean ؎ SD tender points 17 ؎ 1) were randomly assigned to either an exercise group (n ‫؍‬ 17) to perform 3 weekly sessions of training including aerobic, proprioceptive, and strengthening exercises during 12 weeks, or to a control group (n ‫؍‬ 17). Maximal unilateral isokinetic strength was measured in the knee extensors and flexors in concentric and eccentric actions at 60°/second and 210°/second, and in the shoulder abductors and adductors in concentric contractions. Health-related quality of life (HRQOL) was assessed using the EQ-5D questionnaire; pain was assessed on a visual analog scale. All were measured at baseline, posttreatment, and after 6 months. Results. The strength of the knee extensors in concentric actions increased by 20% in both limbs after the training period, and these improvements were maintained after the de-training period in the exercise group. The strength of other muscle actions measured did not change. HRQOL improved by 93% (P ‫؍‬ 0.007) and pain was reduced by 29% (P ‫؍‬ 0.012) in the exercise group during the training, but pain returned close to the pretraining level during the subsequent de-training. However, there were no changes in the control group during the entire period. Conclusion. The therapy relieved pain and improved HRQOL and muscle strength in the lower limbs at low velocity in patients with initial low muscle strength and high number of tender points. Most of these improvements were maintained long term.

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Muscle Performance, Electromyography and Fibre Type Composition in Fibromyalgia and Work-related Myalgia

Cited by 143 publications

References 22 publications

Erratum to “Pathophysiology of upper extremity muscle disorders” [Journal of Electromyography and Kinesiology 16 (2006) 1–16]

Erratum to “Pathophysiology of upper extremity muscle disorders” [Journal of Electromyography and Kinesiology 16 (2006) 1–16]

Interindividual variation of physical load in a work task

Exercise in waist‐high warm water decreases pain and improves health‐related quality of life and strength in the lower extremities in women with fibromyalgia

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