[LBNP test reactions of Salyut-5 orbital station crew members]

During the 49-day mission (first expedition) the Commander did not show a decline in LBNP tolerance, whereas the Flight-Engineer showed a progressive decrease in LBNP tolerance beginning with Mission Day 23. During the 17-day mission (second expedition) the Flight-Engineer exhibited greater cardiovascular reactions to LBNP than the Commander. Postflight examinations confirmed the observations made in the weightless state.