A six-month stay on the International Space Station can be a pain in the back for astronauts. While they may gain up to 2 inches in height temporarily, that effect is accompanied by a weakening of the muscles supporting the spine, according to a new study.
Astronauts have been reporting back pain since the late 1980s, when space missions grew longer. Their flight medical data show that more than half of US astronauts have reported back pain, especially in their lower backs. Up to 28% indicated that it was moderate to severe pain, sometimes lasting the duration of their mission.