| タイトル | Beat-by-beat stroke volume assessment by pulsed Doppler in upright and supine exercise |
| 著者（英） | Greene, E. R.; Loeppky, J. A.; Luft, U. C.; Hoekenga, D. E.; Caprihan, A. |
| 著者所属（英） | Lovelace Foundation for Medical Education and Research |
| 発行日 | 1981-06-01 |
| 言語 | eng |
| 内容記述 | The instantaneous stroke volume (SV) and cardiac output (Q) in eight male subjects during steady-state supine (S) and upright (U) exercises at 300 kpm/min is assessed by a 3.0-MHz pulsed Doppler echocardiograph. The mean transients in heart rate (HR), SV, and Q for each posture were determined and the center-line blood velocities obtained in the ascending aorta. Results show that the mean supine values for SV and Q at rest and exercise were 111 ml and 6.4 l/min and 112 ml and 9.7 l/min, respectively. The corresponding results for U were 76 ml and 5.6 l/min and 92 ml and 8.4 l/min, respectively. The values compare favorably with previous studies utilizing invasive procedures. The transient response of Q following the onset of exercise in U was about twice as fast as in S because of the rapid and almost immediate upsurge in SV. The faster rise in aortic flow in U with exercise represented and additional volume (184 ml) of blood passing through the aorta compared with S in the first 20 exercises. It is suggested that the rapid mobilization of pooled venous blood from the leg veins during U was responsible for the increased blood flow. |
| NASA分類 | AEROSPACE MEDICINE |
| レポートNO | 81A40296 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/415969 |
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