Disuse osteoporosis: physiological aspects

Immobilization in plaster, bed rest, and the weightless state all result in calcium loss which if continued for a few months will result in detectable demineralization of the lower extremities. The upper extremities are "different" bones (presumably differently programmed genetically), for...

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Bibliographic Details
Published in:Calcified tissue international 1984-01, Vol.36 Suppl 1 (S1), p.S146-S150
Main Author: Whedon, G D
Format: Article
Language:English
Subjects:
Animals
Atrophy
Bed Rest - adverse effects
Bone and Bones - metabolism
Bone and Bones - pathology
Calcium - metabolism
Humans
Immobilization
Male
Muscles - metabolism
Nitrogen - metabolism
Osteoporosis - etiology
Osteoporosis - metabolism
Osteoporosis - pathology
Space Flight
Space life sciences
Time Factors
Weightlessness - adverse effects
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Summary:Immobilization in plaster, bed rest, and the weightless state all result in calcium loss which if continued for a few months will result in detectable demineralization of the lower extremities. The upper extremities are "different" bones (presumably differently programmed genetically), for they have not been seen to develop X-ray-detectable demineralization except after several months of severe paralysis. The substantial losses of calcium in inactivity are accompanied by sizeable losses of nitrogen, reflective of muscle atrophy. Hence, we do not know how much of the bone loss in disuse is mediated by diminished direct physical forces on bone, how much by decreased muscle pull on periosteum, and how much perhaps by circulatory or other changes.
ISSN:0171-967X
1432-0827
DOI:10.1007/BF02406148