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Source: Journal of Applied Physiology
Summary:
Astronauts were tested for maximum explosive power (MEP) on force
platforms and maximal cycling power (MCP) on a specialized bike before
and
after spaceflights of 31-180 days
MEP was reduced to 67% after 31 days and 45% after 180 days while MCP
was reduced to 75% in both cases and was recovered more quickly postflight
Muscle mass was reduced by 9-13% regardless of flight duration
Conclusion:
The larger fall in power over muscle mass indicates that
weightlessness may also affect motor unit recruitment
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