Title

Effect Of Headward And Foward Accelerations On The Cardiovascular System

Date

1961

Index Abstract

Contrails only

Photo Quality

Incomplete

Report Number

WADD TR 60-634

Creator

Wood, Earl H.

Marshall, Hiram W.

Lindberg, Evan F.

Headley, Robert N.

Sutterer, William F.

Corporate Author

The Mayo Foundation; Biomedical Laboratory Aerospace Medical Laboratory

Laboratory

Biomedical Laboratory

Extent

54

Identifier

AD0255298

AD0255298

Access Rights

OTS

Distribution Classification

1

Contract

AF 33(616)-5938

DoD Project

7220

DoD Task

71742

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Report Availability

Full text available

Full text available

Date Issued

1961-01

Abstract

The purpose of this research was to measure cardiac output and related physiological variables in human subjects exposed to acceleration stress in various body orientations. Results of these experiments indicate that an average decrease in cardiac output of 22% of control values occurs in subjects exposed to headward accelerations of 4 g. no systematic change in cardiac output could be demonstrated when these same subjects were exposed to forward accelerations of up to 5 g. As the duration of these exposures to acceleration were increased to 10 minutes, no further alterations in output were demonstrable.

Exposure to headward acceleration caused decreases in right atrial and esophageal (intrathoracic) pressure and in the oxygen saturation of arterial blood which were proportional to the magnitude of the acceleration. Forward acceleration, however, cause relatively large increases in right atrial and esophageal pressure but a decrease in arterial oxygen saturation. The decrease in arterial oxygen saturation was prevented by breathing 99.6% oxygen

Provenance

IIT

Type

report

Subject

Cardiovascular System

Acceleration Tolerance

Orientation (Direction)

Physiology

Respiration

Publisher

Wright-Patterson Air Force Base, OH : Biomedical Laboratory, Aerospace Medical Laboratory, Wright Air Development Division, Air Research and Development Command, United States Air Force

Distribution Conflict

No

Format

1 online resource