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Effects of muscle atrophy on motor controlAs a biological tissue, muscle adapts to the demands of usage. One traditional way of assessing the extent of this adaptation has been to examine the effects of an altered-activity protocol on the physiological properties of muscles. However, in order to accurately interpret the changes associated with an activity pattern, it is necessary to employ an appropriate control model. A substantial literature exists which reports altered-use effects by comparing experimental observations with those from animals raised in small laboratory cages. Some evidence suggests that small-cage-reared animals actually represent a model of reduced use. For example, laboratory animals subjected to limited physical activity have shown resistance to insulin-induced glucose uptake which can be altered by exercise training. This project concerned itself with the basic mechanisms underlying muscle atrophy. Specifically, the project addressed the issue of the appropriateness of rats raised in conventional-sized cages as experimental models to examine this phenomenon. The project hypothesis was that rats raised in small cages are inappropriate models for the study of muscle atrophy. The experimental protocol involved: 1) raising two populations of rats, one group in conventional (small)-sized cages and the other group in a much larger (133x) cage, from weanling age (21 days) through to young adulthood (125 days); 2) comparison of size- and force-related characteristics of selected test muscles in an acute terminal paradigm.
Document ID
19860018441
Document Type
Contractor Report (CR)
Authors
Stuart, D. G. (Arizona Water Resources Research Center Tucson, AZ, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1985
Subject Category
AEROSPACE MEDICINE
Report/Patent Number
NASA-CR-177201
NAS 1.26:177201
Funding Number(s)
CONTRACT_GRANT: NAGW-338
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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