Changes in muscle morphology in chronic trapezius myalgia.

Lindman, Rolf; Hagberg, Mats; Ängqvist, Karl-Axel; Söderlund, Karin; Hultman, E.; Thornell, Lars‐Eric

doi:10.5271/sjweh.1693

Cited by 121 publications

(75 citation statements)

References 37 publications

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“…We cannot find any studies in Japan that answer the question clearly. Even in foreign studies, the factor of gender difference in the incidence is not clear yet, but some studies suggest that muscle fiber composition in the trapezius muscle may be related to the gender difference 41,42) . It has been reported that the composition of type 1 fibers, related to myofacial pain, in women's trapezius muscles is higher than in men (Table 5).…”

Section: Gender Differences In the Incidence Of Wmsdsmentioning

confidence: 99%

Work-related Reproductive, Musculoskeletal and Mental Disorders among Working Women-History, Current Issues and Future Research Directions.

et al. 2002

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According to the recent changes of working environments and socio-economical conditions, the proportion of working women are increasing in Japan. Characteristics of occupational workload and stress of Japanese working women are consistent with those in many industrialized countries except man-dominant culture. In this review we describe the history, current issues, and future research directions on occupational health of working women, especially focused on reproductive health, workrelated musculo-skeletal disorders (WMSDs), and mental disorders. In the reproductive health survey, traditionally main concern was about pregnancy outcomes, then fecundity studies, such as time to pregnancy, became topics recently. Future research will be shifted to outcomes not only during pregnancy but also disorders of hormonal balance and climacterium or health conditions after menopause. WMSDs are reviewed on mainly gender difference and its causative factors. Historically, mental health of working women in Japan has focused on the job stress of nurses. We compare results with a lot of recent researches in Europe and U.S.A., where interaction between occupational stress and family roles were studied. It is not easy to predict the prospective status of female workers in Japan, but social, workplace and familial supports will enhance their health promotion.

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Section: Gender Differences In the Incidence Of Wmsdsmentioning

confidence: 99%

Work-related Reproductive, Musculoskeletal and Mental Disorders among Working Women-History, Current Issues and Future Research Directions.

et al. 2002

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“…cka et al 1987). Previous investigations have shown that the type I fibres, known to have a higher oxidative capacity than type II, are surrounded by more capillaries (Andersen, 1975 ;Brodal et al 1977 ;Lindman et al 1991 ;Sta/ l et al 1996). Based on the fibre type pattern, our result of a more extensive capillary network in tensor and levator veli palatini than in the palatopharyngeus and uvula muscle is in agreement with these findings.…”

Section: Muscle Capillarisation and Mitochondrial Enzyme Activitymentioning

confidence: 99%

Characterisation of human soft palate muscles with respect to fibre types, myosins and capillary supply

Stål

Lindman

2000

Journal of Anatomy

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Four human soft palate muscles, and palatopharyngeus, the uvula, the levator and tensor veli palatini were examined using enzyme-histochemical, immunohistochemical and biochemical methods and compared with human limb and facial muscles. Our results showed that each palate muscle had a distinct morphological identity and that they generally shared more similarities with facial than limb muscles. The palatopharyngeus and uvula muscles contained 2 of the highest proportions of type II fibres ever reported for human muscles. In contrast, the levator and tensor veli palatini muscles contained predominantly type I fibres. A fetal myosin heavy chain isoform (MyHC), not usually found in normal adult limb muscles, was present in a small number of fibres in all palate muscles. The mean muscle fibre diameter was smaller than in limb muscles and the individual and intramuscular variability in diameter and shape was considerable. All palate muscles had a high capillary density and an unusually high mitochondrial enzyme activity in the type II fibres, in comparison with limb muscles. No ordinary muscle spindles were observed. The fibre type and MyHC composition indicate that the palatopharyngeus and uvula muscles are functionally involved in quick movements whereas the levator and tensor veli palatini muscles perform slower and more continuous contractions. The high aerobic capacity and the rich capillarisation suggest that the palate muscles are relatively fatigue resistant. Absence of ordinary muscle spindles indicates a special proprioceptive control system. The special morphology of the palate muscles may be partly related to the unique anatomy with only one skeletal insertion, a feature consistent with muscle work at low load and tension and which may influence the cytoarchitecture of these muscles. Other important factors determining the special morphological characteristics might be specific functional requirements, distinct embryological origin and phylogenetic factors.

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“…Ragged-red fibers, the hallmark of mitochondrial myopathies, were identified by their characteristic subsarcolemmal and intermyofibrillar accumulation of reddish material [mitochondria] when stained with the GT staining compared to ordinary fibers. Such fibers have also been found to be more frequent in myalgic trapezius muscle and in muscle exposed to long lasting static work than in healthy non-exposed trapezius muscle (6,8,24,25), as well as in subjects considerably older than the middle-aged subjects of this study (26).…”

Section: Enzymehistochemistry and Immunohistochemistrymentioning

confidence: 80%

“…The incision was placed two centimeters lateral to the midpoint between the seventh process of the cervical spine and the lateral part of the acromion process, a localization which has been in frequent use by others (4,6). The skin and the subcutaneous area were infiltrated with 3 to 5 ml five …”

Section: Sampling Of Muscle Biopsiesmentioning

confidence: 99%

“…Injury, inflammation and changes in muscle blood flow causing peripheral sensitization of nociceptors and hyperreflexia are possible precipitating factors in the acute and in the chronic phase (4)(5)(6)(7). Biopsy studies have shown immunohistochemically confirmed alterations of oxidative metabolism and capillarisation in type I muscle fibers (4,6,8). The presence of tender points, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Three Clusters of Different Properties Characterize Women with Chronic Trapezius Myalgia

Persson¹,

Sjölund²,

Larsson³

2008

Journal of Musculoskeletal Pain

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Objectives: A correlative study on data from 14 women with unilateral chronic shoulder pain was undertaken. oxidase negative fibers and ragged-red fibers; subjects with high prevalence of these two fiber types presented increased pain. In summary, our results suggest that not only capillarization and histopathological findings of the trapezius muscle, but also centrally modulated pain intensity and PPT changes after muscle exertion are associated. Methods Conclusions:Three clusters of different properties were revealed in women with trapezius myalgia, highlighting the multifactorial mechanisms responsible. These components may have prognostic value.

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Changes in muscle morphology in chronic trapezius myalgia.

Cited by 121 publications

References 37 publications

Work-related Reproductive, Musculoskeletal and Mental Disorders among Working Women-History, Current Issues and Future Research Directions.

Work-related Reproductive, Musculoskeletal and Mental Disorders among Working Women-History, Current Issues and Future Research Directions.

Characterisation of human soft palate muscles with respect to fibre types, myosins and capillary supply

Three Clusters of Different Properties Characterize Women with Chronic Trapezius Myalgia

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