| タイトル | Effect of a central redistribution of fluid volume on response to lower-body negative pressure |
| 著者（英） | Kenney, Richard A.; Tomaselli, Clare M.; Hoffler, G. Wyckliffe; Frey, Mary A. B. |
| 著者所属（英） | Bionetics Corp.|NASA Kennedy Space Center|George Washington Univ. |
| 発行日 | 1990-01-01 |
| 言語 | eng |
| 内容記述 | Cardiovascular responses to lower-body negative pressure (LBNP) were studied following 1 hour of 6-deg head-down tilt to determine whether a redistribution of blood volume toward the central circulation modifies the subsequent response to orthostatic stress. Responses of 12 men, ages 30-39 years, were evaluated by electrocardiography, impedance cardiography, sphygmomanometry, and measurement of calf circumference. During the LBNP that followed head-down tilt, as compared with control LBNP (no preceding head-down tilt) subjects, had smaller stroke volume and cardiac output, greater total peripheral resistance, and less calf enlargement. These differences reflect differences in the variables immediately preceding LBNP. Magnitudes of the responses from pre-LBNP to each pressure stage of the LBNP procedure did not differ between protocols. Mean and diastolic arterial pressures were slightly elevated after LBNP-control, but they fell slightly during LBNP post-tilt. |
| NASA分類 | AEROSPACE MEDICINE |
| レポートNO | 90A20145 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/358798 |
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