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Effects of Extended Space Travel on Bone Isamu Kashima 1 , Takashi Sakurai 1 , Koji Nakamura 1 , Ryota Kawamata 1 1Depatment of Radiology, Kanagawa Dental College Keyword: , bone , 微小重力 , microgravity , デジタルX線撮影法 , digital x-ray radiography pp.33-41
Published Date 2005/1/1
DOI https://doi.org/10.11477/mf.1408100023
  • Abstract
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 During extended space travel, the serum calcium levels of astronauts remain normal, however, their urinary calcium excretions increase. Animal experiments using mature rats subjected to mechanical stress infer that calcium loss occurs mainly in weight-bearing bone. The precise mechanism of calcium loss from the bones, however, has not been determined. Using Japanese tree frogs, chick embryos and newt larvae, the relationship between microgravity and the bone changes (calcium loss from weight-bearing bones, development and growth of bones and otoliths) has been investigated. In the frog experiment, the marked influence of short-term changes in gravity on bone was observed in the spongy bone of the weight-bearing posterior vertebral joint. The phenomenon was radiographically similar to osteoporosis and age-related changes in bone. The results from the experiments with chick embryos and newt larvae suggest that microgravity may affect the development and growth of bones and otoliths that have received minimal or zero mechanical stress.


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電子版ISSN 1882-1286 印刷版ISSN 0557-0433 医学書院

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