| Autor: |
Laughlin MH, Witt WM, Whittaker RN Jr |
| Jazyk: |
angličtina |
| Zdroj: |
Aviation, space, and environmental medicine [Aviat Space Environ Med] 1980 Oct; Vol. 51 (10), pp. 1104-8. |
| Abstrakt: |
Four female adult miniature swine were acceleration conditioned for a period of 1 month using repeated acute exposure to simulated aerial combat maneuver profiles which exposed the animals to an average of +4.5G, for 106s. This period of conditioning produced adaptation as evidenced by decreased maximal heart rates during +Gz and by the absence of any +Gz induced gross cardiac pathology. Coronary blood flow was measured in these conditioned animals with the radiolabeled microsphere technique. Blood flows were measured under resting conditions, during 60s exposures to +3Gz and +5Gz and 10 min after +5Gz exposure. Coronary flow was increased 2-3 fold during +3Gz and +5Gz. The regional distribution of coronary blood flow during +Gz was similar to that under resting control conditions. There were no significant differences between coronary blood flows during +Gz in these conditioned animals and the values previously reported from the initial exposure of miniature swine to similar levels of +Gz. These results indicate that 1 month of acceleration conditioning of the types used in these studies has no significant effect on the response of coronary blood flow to +3Gz and +5Gz stress. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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