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Journal of Applied Physiology, Vol 68, Issue 1 1-12, Copyright © 1990 by American Physiological Society
ARTICLES |
D. B. Thomason and F. W. Booth
Department of Physiology and Cell Biology, University of Texas Medical School, Houston 77225.
The unweighting model is a unique whole animal model that will permit the future delineation of the mechanism(s) by which gravity maintains contractile mass in postural (slow-twitch) skeletal muscle. Since the origination of the model of rodent hindlimb unweighting almost one decade ago, about half of the 59 refereed articles in which this model was utilized have been published in the Journal of Applied Physiology. Thus the purpose of this review is to provide, for those researchers with an interest in the hindlimb unweighting model, a summation of the data derived from this model to data and hopefully to stimulate research interest in aspects of the model for which data are lacking. The stress response of the animal to hindlimb unweighting is transient, minimal in magnitude, and somewhat variable. After 1 wk of unweighting, the animal exhibits no chronic signs of stress. The atrophy of the soleus muscle, a predominantly slow-twitch muscle, is emphasized because unweighting preferentially affects it compared with other calf muscles, which are mainly fast-twitch muscles. The review considers the following information about the unweighted soleus muscle: electromyogram activity, amount and type of protein lost, capillarization, oxidative capacity, glycolytic enzyme activities, fiber cross section, contractile properties, glucose uptake, sensitivity to insulin, protein synthesis and degradation rates, glucocorticoid receptor numbers, responses of specific mRNAs, and changes in metabolite concentrations.
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