Response of the Cardiovascular System to Vibration and Combined Stresses
Abstract
Data indicate that for sinusoidal acceleration of 1, 2, and 3 cycles per minute at amplitudes of 0 to +2g(z) and +1 to +2g(z), 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 +g(z) orthostasis and g(z) vibration produces a more sensitive cardiovascular system capable of responding with larger changes in mean aortic flow than those seen with g(z) vibration alone.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 1975
- Accession Number
- ADA038636
Entities
People
- Charles F. Knapp
Organizations
- University of Kentucky