[ワシントン ２日 ロイター] –A study on the bone mass of 17 astronauts staying at the International Space Station (ISS) was conducted, and the effects of bone density reduction in outer space and countermeasures were published in the academic journal “Scientific Reports”. ..
14 male and 3 female astronauts participated in the study compiled by Professor Lee Gabel, a professor of exercise science at the University of Calgary, Canada, with an average age of 47 years. The mission period in space was 4-7 months, with an average of regarding 5 and a half months.
One year following returning to Earth, the aviators reduced the bone density of the tibia (between the knee and ankle) by an average of 2.1% and the bone strength by 1.3%. Nine did not recover bone density following returning.
The nationality of the astronauts studied was not disclosed, but he was a US, Canadian, European, and Japanese astronaut who had stayed on the ISS for the past seven years.
Studies have shown that longer missions result in more bone loss and less chance of subsequent recovery. It was also found that exercise on the ISS is important to prevent loss of muscles and bones, and that aviators who trained a lot to train their legs are more likely to recover their bones.
