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Response and adaptation of Beagle dogs to hypergravityEight male Beagle dogs, five months old, were centrifuged continuously for three months at progressively increasing loads. Heart rate and deep body temperature were monitored continuously by implant biotelemetry. Initially, centrifuged dogs showed transient decreases in heart rate and body temperature along with changes in their diurnal rhythm patterns. Compared with normal gravity controls, exposed dogs showed a slower growth rate and a reduced amount of body fat. Blood protein, total lipids, cholesterol, calcium, packed cell volume, red blood cell count, and hemoglobin were also decreased significantly. Absolute weights of the leg bones of centrifuged dogs were significantly greater than controls. Photon absorptiometry revealed significant density increases in selective regions of the femur and humerus of centrifuged dogs. In spite of the various changes noted, results from this and other studies affirm the view that dogs can tolerate and adapt to sustained loads as high as 2.5 g without serious impairment of their body structure and function.
Document ID
19750060056
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Oyama, J.
(NASA Ames Research Center Biomedical Research Div., Moffett Field, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Subject Category
Life Sciences (General)
Accession Number
75A44128
Distribution Limits
Public
Copyright
Other

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