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• NASA

Sources

• Carreau, Mark. "Centrifuges, other devices may keep astronauts fit." Houston Chronicle. April 19, 2007. http://www.chron.com/disp/story.mpl/space/4728356.html
• Greensfelder, Liese. "Why astronauts suffer bone loss." Medical News Today. Feb. 23, 2004.
  http://www.medicalnewstoday.com/articles/6098.php
• Iwamoto, Jun, Tsuyoshi Takeda and Yoshihiro Sato. "Interventions to prevent bone loss in astronauts during space flight." The Keio Journal of Medicine. Vol. 54, Num. 2, 2005. 55-59.
  http://www.kjm.keio.ac.jp/past/54/2/55.pdf
• Sochaczewski, Paul and Andrew Leopold. "What's the link between astronauts and osteoporosis?" International Osteoporosis Foundation. May 31, 2006.
  http://www.spaceref.com/news/viewpr.html?pid=19970
• "Astronaut fitness/physical conditioning." National Aeronautics and Space Administration. http://www.nasa.gov/pdf/64247main_ffs_factsheets_fitness.pdf
• "Dartmouth researchers to design computer network to monitor bone loss in astronauts." Dartmouth News. July 23, 2001. http://www.dartmouth.edu/~news/releases/2001/july01/mobileagents.html
• "Fighting osteoporosis with ESA innovations." European Space Agency. May 9, 2005.
  http://www.esa.int/esaHS/SEMEZU2IU7E_business_0.html