| タイトル | Effects of Age on Temperature Responses During Exposure to Hypergravity |
| 著者（英） | Dalfan, Bonnie P.; Fung, C.K.; Daunton, N. G.; Wang, T. J.; Wade, C. E.; Yuan, F.; Moran, M. M.; Baer, L. A.; Corcoran, M. L. |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 2001-01-16 |
| 言語 | eng |
| 内容記述 | Rats subjected to centrifugation show a marked decrease in body temperature relating to gravity level. Several studies have indicated, that an initial response to centrifugation is followed by acclimation. To test for differences between young (Y; 2 months) and mature (M; 8 months) rats in their response in temperature, both groups were exposed to hypergravity induced by centrifugation. Thirty-six male rats were divided into four groups according to age and G-load (control (1.0G-Y and 1.0G-M), 2.0G-Y or 2.0G-M) and were housed in pairs in standard vivarium cages. During the 7-day period of centrifugation, temperature was measured every five minutes by surgically implanted telemeters. Body mass was measured daily. We found that initial body temperature in 2.0G-M was less than that of 2.0G-Y. Both hypergravity groups (2.0G-Y and 2.0G-M) showed a decrease in temperature at the onset of centrifugation, and the change in temperature (Delta = 0.5 C) remained the same between the groups. Significant differences persisted with 2.0G-Y recovering to control values in four days and 2.0G-M recovering in five days. These results indicate that the mature animals have a similar response as the younger animals, but take longer to acclimate. |
| NASA分類 | Behavioral Sciences |
| 権利 | No Copyright |
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