Accession Number : AD0634080

Title :   CARDIOVASCULAR EFFECTS OF ROTATION IN THE Z AXIS,

Corporate Author : AEROSPACE MEDICAL RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Urschel ,Charles W. ; Hood,William B. , Jr

Report Date : 1966

Pagination or Media Count : 7

Abstract : Rotation of the seated subject about the Z axis (Rz) results in a radial acceleration gradient impeding venous return thereby representing a cardiovascular stress. The cardiovascular responses of volunteer subjects instrumented with indwelling arterial and venous catheters were measured during four rotational profiles combining two rates of angular acceleration (0.1 and 0.8 radians per second per second) and two rotational speeds (60 and 120 RPM). There was a three-minute plateau at peak velocity. Centripetal acceleration at hand/foot radius (0.5 meters) was 1.8 and 7.4G at 60 and 120 RPM, respectively. Rotation at 60 RPM represented no significant stress. Three minute 120 RPM runs however caused progressive tachycardia, narrowing of pulse pressure, and a drop in mean arterial pressure, thus inferentially a drop in cardiac output. Tolerance would thus be expected to be limited by the ability of the circulation to maintain venous return. (Author)

Descriptors :   (*ACCELERATION TOLERANCE, *CARDIOVASCULAR SYSTEM), (*ROTATION, STRESS(PHYSIOLOGY)), ARTERIES, VEINS, CANNULATION, BLOOD PRESSURE, BLOOD VOLUME, TOLERANCES(PHYSIOLOGY)

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE