The morphology of histochemically prepared muscle sections from the gastrocnemius and plantaris muscles of flight and vivarium control rats was studied quantitatively. Both fast-twitch and slow-twitch fibers were significantly smaller in flight groups than in control groups. Fibers in group 4F were somewhat larger than in 1F, presumably due to growth after recovery. Fibers in 4V were slightly larger than in 1V, presumably due to age. The slow fibers showed more spaceflight induced size loss than fast fibers, suggesting they suffered more from hypogravity. The proportion of slow fibers was also lower in the flight groups, suggesting spaceflight induced fiber type conversion from slow to fast.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Experiment K-308: Automatic analysis of muscle fibers from rats subjected to spaceflight


    Contributors:


    Publication date :

    1981-08-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    Experiment K-6-07. Metabolic and morphologic properties of muscle fibers after spaceflight

    Edgerton, R. / Miu, B. / Martin, Thomas P. et al. | NTRS | 1990


    Spaceflight and growth effects on muscle fibers in the rhesus monkey

    Bodine-Fowler, Sue C. / Roy, Roland R. / Rudolph, William et al. | NTRS | 1992


    Functional properties of slow and fast gastrocnemius muscle fibers after a 17-day spaceflight

    Widrick, J. J. / Romatowski, J. G. / Norenberg, K. M. et al. | NTRS | 2001


    Adaptation of fibers in fast-twitch muscles of rats to spaceflight and hindlimb suspension

    Jiang, Bian / Ohira, Yoshi / Roy, Roland R. et al. | NTRS | 1992