Their physical condition must exceed even those set for fighter pilots. For instance, Xu said, astronauts cannot have arrhythmia, an irregular heartbeat, which can easily be triggered in space. Fighter pilots can fly with arrhythmia.
Too much calcium can also be a problem as the zero gravity in space means that astronauts could lose excessive amounts and suffer clogging in their blood vessels.
The thick spacesuits will aggravate any skin diseases. On top of this, their families must have a clean bill of health regarding contagious diseases, such as hepatitis.
Xu, who has participated in the selection process since the 1990s, believes that the "superhuman beings" were really only true for the first batch of 14 male reserve astronauts, selected between 1995 and 1997. This was a period when the selection panel had little experience and few useful references and had to screen for all potential problems.
But now that China has sent six astronauts into space, the criteria has been relaxed, he said
The second batch of reserve astronauts do not have to meet requirements on their Gendurance, as fighter pilots do. This measures the ability of the body to withstand extreme gravitational forces.
The criteria for combating hypoxia, lack of oxygen, is not as strict as it is for fighter pilots.
A new selection criteria is being drafted, Xu said.With the easing of standards, the manned space program will be a realistic goal that motivates a new generation, he said.
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