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Experiment M-6: Bone DemineralizationDensitometric evaluations of serial radiographs of "normal" subjects have often shown rather frequent changes in bone mass within relatively short periods of time. For this reason it was decided to make two pre-flight and two post flight radiographs of the Gemini V backup crew. In comparing the changes observed preflight and post flight as the conventional os calcis scanning site between the two crews, it was found that no changes greater than 4 percent were evident in either member of the backup crew. In comparing the changes observed preflight and postflight as the conventional o calcis scanning site between the two crews, it was found that no changes greater than 4 percent were evident in either member of the backup crew. This is in contract to the 15.1 and 8.9 percent losses observed in the prime crew. It has long been known that the skeletal system experiences a general loss of mineral under immobilization or extended bed rest. However, in both Gemini IV and Gemini V studies, bone mass losses were greater in both the os calcis and phalanx than were shown by the TWU bed-rest subjects during the same period of time. Although the bone mass losses in the 8-day Gemini V flight were generally greater than in the 4-day Gemini IV flight, the information to date is still insufficient to conclude that the losses tend to progress linearly with time, or whether a form of physiological adaptation may occur in longer space flights.
Document ID
20040043741
Document Type
Other
Authors
Mack, Pauline B. (Nelda Childers Stark Lab. for Human Nutrition Research United States)
Vose, George (Texas Woman's Univ. TX, United States)
Vogt, Fred B. (Texas Inst. for Rehabilitation and Research TX, United States)
LaChance, Paul A. (NASA Manned Spacecraft Center United States)
Date Acquired
September 7, 2013
Publication Date
January 6, 1966
Publication Information
Publication: Manned Space-Flight Experiments: Gemini V Mission
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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