PRINCIPAL INVESTIGATOR(S) : G. Wyckliffe Hoffler, Arnauld E. Nicogossian, 



Stuart A. Bergman, and Robert L. Johnson 



EXPERIMENT TITLE/NUMBER : Cardiovascular Evaluations 



PROGRAM/MISSION : Apollo-Soyuz Test Project 



CLASSIFICATION : Human 



DISCIPLINE(S) : Cardiovascular 



OBJECTIVES : To determine the response of the cardiovascular system to 

 weightlessness . 



PROTOCOL : Preflight: orthostatic tolerance test by LBNP, heart size 

 measurement by chest X-rays, resting leg volume measurement, echocardiogram. 

 Postf light: LBNP, chest X-rays, leg volume. 



EQUIPMENT : Echocardiograph , LBNP device, vectorcardiograph, X-rays. 



RESULTS : No results could be considered unusually aberrant; only a single 

 episode of presyncope occurred. Because LBNP recordings made immediately 

 after flight were deleted, no useful information was obtained from systolic 

 time intervals, vectorcardiograms, or echocardiograms. 



CONCLUSIONS : Findings did not differ from those resulting from previous U. S. 

 manned space missions: a modest postf light decrement in orthostatic tolerance 

 without operational significance was demonstrated. The inflight leg volume 

 data augment those from the Skylab 4 mission and elaborate further on the 

 early inflight period. 



PUBLICATIONS: 272 



33 



