|Lower Body Negative Pressure Learning Task|
||This learning task will
test your knowledge on the effects of lower body negative pressure on several
If the crew member has this stress applied on earth, can you predict not only the direction of change for each of the above variables but also how quickly during the 50 minutes of LBNP these changes occur?
Suppose this stress is applied to our crew member in space. How
will the cardiovascular responses change after 2,8 and 16 days of space
|Lower Body Negative Pressure Learning Task Answer|
Figure 2-8 of Rowell's book provides the cardiovascular responses found on earth. As the pressure drops to -50 mmHg cardiac output, and stroke volume decline while heart rate and forearm vascular resistance(not shown) iincreases. Muscle sympathetic nerve activity increases. Blood flow to the arms but mostly the splanchnic region decreases. Due to the long duration application of this stress, 50 minutes, the cardiovasculr system makes both quick and slow adaptations.