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  • 1.
    Kadi, Fawzi
    et al.
    Department of Physical Education and Health, Örebro University, Örebro, Sweden.
    Karlsson, Camilla
    Institute of Physiology and Pharmacology, Department of Physiology, Göteborg University, Göteborg, Sweden.
    Larsson, Britt
    Department of Occupational and Environmental Medicine, Lund University Hospital, Lund, Sweden.
    Eriksson, Jennie
    Halmstad University, School of Business and Engineering (SET).
    Larval, Maria
    Halmstad University, School of Business and Engineering (SET).
    Billig, Håkan
    Institute of Physiology and Pharmacology, Department of Physiology, Göteborg University, Göteborg, Sweden.
    Jonsdottir, Ingibjörg H.
    Halmstad University, School of Business and Engineering (SET). Institute of Physiology and Pharmacology, Department of Physiology, Göteborg University, Göteborg, Sweden.
    The effects of physical activity and estrogen treatment on rat fast and slow skeletal muscles following ovariectomy2002In: Journal of Muscle Research and Cell Motility, ISSN 0142-4319, E-ISSN 1573-2657, Vol. 23, no 4, p. 335-339Article in journal (Refereed)
    Abstract [en]

    Decreased estrogen production is associated with changes in the skeletal, cardiovascular and muscular systems. At the level of skeletal muscles, it has been shown that a reduction in force production occurs at menopause but the underlying mechanisms are still unknown. The aim of the study was to investigate the effects of ovariectomy on myosin heavy chain (MyHC) composition. Additionally, we studied the effects of physical activity and the combined effects of physical activity and estrogen treatment on MyHC content in ovariectomised (OX) animals. Twenty-five rats were randomly assigned to five different groups: controls, runners, OX, ovariectomised runners and ovariectomised runners receiving estrogen. Exercise consisted of voluntary running for 5 weeks. Two muscles were analysed: m. extensor digitorum longus, EDL, (fast muscle) and m. soleus (slow muscle). MyHC content was analysed on 8% gel electrophoresis. The level of running activity is reduced in OX animals and estrogen administration is associated with the normalisation of the level of physical activity. Ovariectomy induces a shift from fast to slow MyHC isoforms in both the soleus and EDL. When OX animals are allowed to run, alterations in MyHC isoforms are still observed in the EDL but not in the soleus. When physical activity is combined with estrogen treatment no alterations are observed in both muscles. In conclusion, this study shows that ovariectomy induces alterations in the contractile properties of skeletal muscles and that physical activity in combination with estrogen treatment are associated with the maintenance of slow and fast muscle characteristics.

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