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Contractile function of single muscle fibers after hindlimb suspensionThe effects of two weeks of hind-limb suspension (HS) on the functional properties of slow-twitch and fast-twitch single fibers isolated from the predominantly slow-twitch soleus and fast-twitch gastrocnemius of the suspended leg of rats were investigated. Single fibers were suspended between a motor arm and force transducer, and, after their functional properties were studied, the fiber type was established by the myosin heavy chain analysis. It was found that, after HS, the greatest decrease in diameter and a reduction in peak tension occurred in slow-twitch fibers from soleus, followed by slow-twitch fibers from gastrocnemius. Fast-twitch fibers from the red gastrocnemius showed a significant reduction in diameter but no change in peak tension. No effect of HS was observed on the diameter of the fast-twitch fibers from the white gastsrocnemius (which is known to contain 87 percent fast glycolytic fibers).
Document ID
19890057006
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gardetto, P. R.
(Marquette Univ. Milwaukee, WI, United States)
Schluter, J. M.
(Marquette Univ. Milwaukee, WI, United States)
Fitts, R. H.
(Marquette University Milwaukee, WI, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1989
Publication Information
Publication: Journal of Applied Physiology
Volume: 66
ISSN: 0161-7567
Subject Category
Aerospace Medicine
Accession Number
89A44377
Funding Number(s)
CONTRACT_GRANT: NAG2-212
Distribution Limits
Public
Copyright
Other

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