Title

Physiology of Simple Tumbling. Part 1. Animal Studies

Date

1954

Index Abstract

Coming Soon

Photo Quality

Undetermined

Report Number

WADC TR 53-139 Part 1

Creator

Edelberg, R.

Weiss, H. S.

Charland, P. V.

Rosenbaum, J. I.

Corporate Author

Aero Medical Laboratory

Laboratory

Aero Medical Laboratory

Extent

45

PB Number

PB134853

NTRL Accession Number

AD036304

Identifier

AD0036304

Access Rights

Unknown

Distribution Classification

1

DTIC Record Exists

Yes

Distribution Change Authority Correspondence

AFAL LTR

Distribution Change Action Date

1/1/1900

Abstract

The tumbling that follows emergency escape from an aircraft by seat ejection or that occurs during prolonged free-fall poses a threat to the escaping crewman. Tumbling was simulated in the laboratory on a horizontal spin table using anesthetized dogs as subjects preliminary to human experimentation. The axis of rotation was through the heart or at various locations up to 20 cm caudad. The centrifugal forces proved effective in producing peripheral pooling with a consequent reduction in heart filling and cardiac output, as evidenced by the reduced pulse pressure and arteriovenous pressure difference. The decrease in perfusion pressure and the accompanying apnea was enough to produce hypoxia at speeds greater than 140 rpm, as evidenced by oral cyanosis. Concurrently, the elevated hydrostatic pressures were sufficient to produce hemorrhage in the extremities. A tachycardia or bradycardia may occur, depending on the location of the center of rotation. In general, pathology is less when the center of rotation is at the heart than when located at the more caudad positions, but circulation is less impaired as the center is moved caudad.

Report Availability

Not available via Contrails

Date Issued

1954-01

Index In

DTIC

Type

report