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J Appl Physiol 73: 4S-9S, 1992;
8750-7587/92 $5.00
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Journal of Applied Physiology, Vol 73, Issue 2 4S-9S, Copyright © 1992 by American Physiological Society

ARTICLES

Adaptations of young adult rat cortical bone to 14 days of spaceflight

A. C. Vailas, R. Vanderby Jr, D. A. Martinez, R. B. Ashman, M. J. Ulm, R. E. Grindeland, G. N. Durnova and A. Kaplansky
Biodynamics Laboratory, University of Wisconsin-Madison 53792.

To determine whether mature humeral cortical bone would be modified significantly by an acute exposure to weightlessness, adult rats (110 days old) were subjected to 14 days of microgravity on the COSMOS 2044 biosatellite. There were no significant changes in peak force, stiffness, energy to failure, and displacement at failure in the flight rats compared with ground-based controls. Concentrations and contents of hydroxyproline, calcium, and mature stable hydroxylysylpyridinoline and lysylpyridinoline collagen cross-links remained unchanged after spaceflight. Bone lengths, cortical and endosteal areas, and regional thicknesses showed no significant differences between flight animals and ground controls. Our findings suggest that responsiveness of cortical bone to microgravity is less pronounced in adult rats than in previous spaceflight experiments in which young growing animals were used. We hypothesize that 14 days of spaceflight may not be sufficient to impact the biochemical and biomechanical properties of cortical bone in the mature rat skeleton.


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E. R. Morey-Holton, B. P. Halloran, L. P. Garetto, and S. B. Doty
Animal housing influences the response of bone to spaceflight in juvenile rats
J Appl Physiol, April 1, 2000; 88(4): 1303 - 1309.
[Abstract] [Full Text] [PDF]


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