Response of the Cardiovascular System to Vibration and Combined Stresses
Interim rept. 1 Sep 1974-31 Aug 1975
KENTUCKY UNIV LEXINGTON WENNER-GREN RESEARCH LAB
Pagination or Media Count:
Data indicate that for sinusoidal acceleration of 1, 2, and 3 cycles per minute at amplitudes of 0 to 2gz and 1 to 2gz, the cardiovascular system of chronically instrumented dogs was capable of following with peak to peak responses equal to those obtained for sustained tests with mean responses correlatable with the mean g level of the test. The usefulness of the awake, chronically instrumented canine as a surrogate for man under conditions of orthostatic loading along the spinal axis was studied and the cardiovascular responses were found to be similar. It was further suggested the canine might also be used as a surrogate for man in non-extreme states of cardiovascular deconditioning. Other data suggests that in these subjects the combined stress of gz orthostasis and gz vibration produces a more sensitive cardiovascular system capable of responding with larger changes in mean aortic flow than those seen with gz vibration alone.
- Stress Physiology