Astronauts who have returned more than three months after space flight may show signs of incomplete bone recovery after a year on Earth, but adding resistance-based motion during space flight , You can suppress the loss of bone mass.A small study published in Scientific Reports17 international astronauts say that while the tibia is partially restored, sustained bone loss after one year is equivalent to 10 years of normal age-related bone loss on Earth. I found that I would do it.
Stephen Boyd and colleagues imaged 17 astronauts (14 males and 3 females) before spaceflight, on their return to Earth, and after 6 and 12 months of recovery. They performed bone scans of the tibia (new bone) and radius (forearm) to calculate bone resistance (destructive load) to fractures, bone minerals within bone tissue, and tissue thickness. The author also recorded exercises such as cycling, treadmill running, and deadlift completed by astronauts during and after flight.
One year after the flight, the median results of 16 astronauts showed incomplete recovery of the tibia. The median tibial fracture load, which measures bone strength, decreased by 152.0 Newtons from 10,579 Newtons before flight to 10,427 Newtons one year later. Total bone mineral density was reduced by 4.5 milligrams per cubic centimeter compared to pre-flight levels of 326.8 mg / cm.3.. All astronaut forearm measurements were no different at 12 months of recovery compared to pre-flight.
The authors observed significantly less bone recovery for astronauts on missions over 6 months (8 astronauts in total). For astronauts on missions of 6 months or more, the median tibial failure load decreased by 333.9 Newtons one year after the flight, but astronauts on missions of less than 6 months (9). Astronaut), the fault load has been reduced by 79.9 Newtons. Similar differences were seen in the total bone mineral density of the tibia. Overall, nine astronauts (seven from a long mission) did not fully restore total tibial mineral density after 12 months.
For all astronauts, those who completed more deadlift training in flight compared to individual pre-flight training were identified as part of those who restored tibial bone mineral density. The authors found that jump resistance-based exercise, which provides a dynamic load that impacts the legs, prevents bone loss and promotes bone formation in space flight missions, similar to the exercise routines currently in use. Suggests that it may help.
Gavel, L, et al. (2022) Incomplete recovery of bone strength and trabecular microarchitecture in the distal tibia one year after returning from long-term space flight. Scientific Reports. doi.org/10.1038/s41598-022-13461-1..