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Changes in muscle morphology in chronic trapezius myalgia
Rolf Lindman, Mats Hagberg, Karl-Axel Ängqvist, Karin Söderlund, Eric Hultman and Lars-Eric Thornell
Scandinavian Journal of Work, Environment & Health
Vol. 17, No. 5 (October 1991), pp. 347-355
Published by: the Scandinavian Journal of Work, Environment & Health, the Finnish Institute of Occupational Health, the Danish National Research Centre for the Working Environment, and the Norwegian National Institute of Occupational Health
Stable URL: http://www.jstor.org/stable/40965915
Page Count: 9
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Muscle biopsies of the descending portion of the trapezius muscle from female patients with chronic trapezius myalgia and from healthy women were analyzed with enzyme histochemical and immunohistochemical methods. Frequency, area, and capillarization of the muscle fiber types were determined. A biochemical analysis determined the lactate concentration of mixed muscle samples and the adenosine triphosphate (ATP) and phosphocreatine levels in single muscle fibers. The patients had larger type I fibers and a lower capillary ¡ fiber area ratio for type I and type IIA fibers. The patients also exhibited lower levels of ATP and phosphocreatine in both type I and type II fibers. It is suggested that there might have been an imbalance between the capillary supply and the cross-sectional fiber area of type I and type IIA fibers in the patients. This imbalance might be of significance in the development of muscular fatigue and pain.
Scandinavian Journal of Work, Environment & Health © 1991 Scandinavian Journal of Work, Environment & Health