NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The effect of increased gravitational stress on boneA group of 34 adult male chickens were chronically accelerated over an 18-week period; for the last 4 weeks the surviving animals were subjected to a 3-g field. Males of a similar weight and age were used as static controls. The objective was to evaluate the effects of an altered gravitational state on the physical properties of the tibia bone tested for torsional fracture. Of the 34 initial animals, 15 survived for the entire period and were subjected to analysis. The results suggest that the altered morphology produced by increased gravitational fields does not materially affect bone strength, at least in torsion. Decreased bone diameters were accompanied by increased cortical thickness without change in the bone resistance to torsion. The findings of increased cortical thickness with decreased bone diameter suggest reversal of the usual cellular dynamics of adult bone. Data on bone ash and density failed to reveal any substantial changes in bone mineral or organic content. Histological examination of the cortical bone did not disclose any evidence of pathology.
Document ID
19780031297
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Riggins, R. S.
(California Univ. Davis, CA, United States)
Chacko, K. A.
(California, University Davis, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Subject Category
Life Sciences (General)
Meeting Information
Meeting: Open Meeting of the Working Group on Space Biology
Location: Philadelphia, PA
Start Date: June 8, 1976
End Date: June 19, 1976
Accession Number
78A15206
Funding Number(s)
CONTRACT_GRANT: NGR-05-004-008
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available