The TBone study, conducted over a seven-year period starting in 2015, found that prolonged weightlessness accelerated bone loss in the astronauts.
"We found that weight-bearing bones only partially recovered in most astronauts one year after spaceflight," said Dr. Leigh Gabel, an assistant professor in the faculty of kinesiology and lead author of the study.
The researchers travelled to Johnson Space Center in Houston to scan the wrists and ankles of the astronauts before they left for space, on their return to Earth then after six months and one year. "We've seen astronauts who had trouble walking due to weakness and lack of balance after returning from spaceflight to others who cheerfully rode their bike on Johnson Space Center campus to meet us for a study visit," said Dr. Steven Boyd, director of the McCaig Institute for Bone and Joint Health and professor in the Cumming School of Medicine.
The University of Calgary's former chancellor and astronaut, Robert Thirsk, said he knows how difficult it can be to be back on solid ground.
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