From Time Magazine, December 8, 1952:
The probable effect of zero gravity on the human nervous system is far more serious. The nervous system, says Dr. H. Strughold, head of the School of Space Medicine, was designed to work on the surface of the earth in a gravity field of one G. How would the rocket crew feel while the rocket was accelerating? They would lie barely conscious on their contoured G-couches. At this stage the rocket would be under automatic control; the men, weighing nine times normal, would not be capable of any action at all. With the power cut off and the rocket coasting upward, gravity would drop to zero. The men would be expected to rise from their beds of pain (not knowing which end is up) and perform navigation feats that would tax a professor of celestial mechanics. Dr. Strughold does not think they could work at peak form; they would be lucky to accomplish anything.