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Astronauts' exercise regime reveals how to stay fit

 Astronauts on the International Space Station (ISS) are not only working out to keep their hearts healthy but also to generate data to advance knowledge of health and fitness on Earth, a NASA research indicates

How spaceflights weaken human immune system

Results of nearly two years` worth of study on biological samples from space shuttle Atlantis, have shed light on how the human immune system responds to stress and assaults while in space - and maybe here on Earth.