Influence of fixed muscle length and contractile properties on atrophy and subsequent recovery in the rat soleus and plantaris muscles

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Author(s)

    • FUJITA Naoto
    • Department of Rehabilitation Sciences, Kobe University Graduate School of Health Sciences
    • ARAKAWA Takamitsu
    • Department of Rehabilitation Sciences, Kobe University Graduate School of Health Sciences
    • MATSUBARA Takako
    • Faculty of Health Sciences, Department of Rehabilitation Physical Therapy Course, Nihon Fukushi University
    • ANDO Hiroshi
    • Department of Rehabilitation Sciences, Kobe University Graduate School of Health Sciences
    • MIKI Akinori
    • Department of Rehabilitation Sciences, Kobe University Graduate School of Health Sciences

Abstract

This study examined muscular atrophy and the recovery process induced by hindlimb unloading and joint immobilization in the rat soleus and plantaris muscles. Rats were divided into control, hindlimb unloading (HU), hindlimb unloading with ankle joint immobilization at the maximum dorsiflexion (HUD), and maximum plantarflexion (HUP) groups. The hindlimb was reloaded after fourteen days of unloading, and muscle atrophy and walking ability were assessed at 0, 3, and 7 days of reloading. A cross sectional area of muscle fibers in the soleus muscle on day 0 of reloading revealed sizes in order from the control, HUD, HUP down to the HU group, indicating that the HU group was the most atrophied among the four groups. These values in the plantaris muscle ranged in order from the control, HU, HUD, to HUP groups, the HUP group being the most atrophied among the four groups. These muscles recovered from atrophy in the same descending order, and the values in the HUD and HUP groups slowly recovered during the reloading periods. The HUD and HUP groups showed a central core lesion and reloading-induced lesions in some type I muscle fibers after the immobilization and reloading, one possible reason for the delayed recovery in these groups. The muscle atrophy in the HU, HUD, and HUP groups remained at day 7 although the walking ability appeared to be normal. Accordingly, further rehabilitation therapy might be necessary even if the functional ability appears to be normal.

Journal

  • Archives of Histology and Cytology

    Archives of Histology and Cytology 72(3), 151-163, 2009-11-01

    International Society of Histology and Cytology

References:  34

Codes

  • NII Article ID (NAID)
    10027156856
  • NII NACSIS-CAT ID (NCID)
    AA1068990X
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09149465
  • Data Source
    CJP  J-STAGE 
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