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en.wikipedia.org/wiki/Effect_of_spaceflight_on_the_human_body

Humans venturing into the environment of space can have negative effects on the body. Significant adverse effects of long-term weightlessness include muscle atrophy and deterioration of the skeleton (spaceflight osteopenia). Other significant effects include a slowing of cardiovascular system functions, .... Space Shuttle astronauts wore a fitted elastic garment called a Crew Altitude ...

www.space.com/26903-astronaut-immune-systems-in-space.html

Aug 22, 2014 ... New research led by NASA shows that spaceflight confuses the immune system.

www.nasa.gov/content/study-reveals-immune-system-is-dazed-and-confused-during-spaceflight-u

Studies of how space flight affects the immune system may provide benefits to ... NASA's One-Year Mission Investigates How Space Affects Astronauts' Functional Performance .... This mission was the first of its kind to last 45 days, as well as incorporate sleep ... We are used to working and living our lives at a higher level.

www.nasa.gov/mission_pages/station/research/news/functional_immune

European Space Agency astronaut Andre Kuiper, shown here in the Human ... Studies have shown in microgravity there are immune system modifications. ... includes investigators from the NASA Space Radiation Laboratory, as well as external ... “On Earth, you usually don't go to the doctor until you get sick,” said Crucian.

io9.gizmodo.com/why-do-our-immune-systems-falter-in-space-1668217291

Dec 8, 2014 ... The exact mechanism behind why our immune systems become less ... What is known, though, is that 1) Astronauts have better immunity on Earth than in space, and ... (and happily reversible) impacts to how well immune systems work. ... Doesn't our immune system rely heavily on bone marrow, and don't ...

www.nasa.gov/mission_pages/station/research/news/TripleLux

Space station research may help scientists enable our bodies to fight such threats. ... Astronauts' immune systems don't work as well in microgravity as on Earth.

science.time.com/2012/10/22/dont-sneeze-in-space-when-astronauts-get-sick

Oct 22, 2012 ... Few people had a worse time in space than the crew of Apollo VII. ... Mermel began his work by surveying the health records of astronauts across the 30 ... and skin infections, as well as flu-like illnesses and viral gastroenteritis. ... the immune system can go on the fritz in space: wounds heal more slowly; ...

www.popsci.com/science/article/2009-11/mutant-bacteria-are-likely-threaten-future-space-travelers

Nov 5, 2009 ... What's worse, bacteria grow faster in space, for reasons that are not completely ... and antibiotics don't work as well in space, so higher concentrations are ... Apollo that astronauts' immune systems don't function well in space.

phys.org/news/2017-07-sustain-well-being-prolonged-space-flights.html

Jul 24, 2017 ... Scientists are working to fully understand how time in space effects the human body ... Still, many astronauts suffer back pain for years after returning to Earth. ... continue to resorb bone, but the osteoblasts don't replenish it. ... "So, we knew back then that the immune system wasn't working well in space.".