Feeling ready for the weekend. Mom is under the weather, so we’ll be on nurse duty. How about you? #veryevolved #LilBroDar
#DandRDoScience: To mitigate the loss of muscle and bone mass in the human body in microgravity, the astronauts work out at least two hours a day.
When an astronaut spends a prolonged amount of time in space, he or she experiences the effects of microgravity and remains weightless during the whole trip. Instead of staying anchored to the floor like we do on Earth, astronauts float around much like swimmers do underwater, and they have to hold on to something if they want to stay stable.
Researchers have found that after spending weeks or months in a weightless environment, astronauts lose a significant amount of bone mineral density (BMD). The loss of BMD in the spine, neck and pelvis is about 1.0 to 1.6 percent per month, while cortical bone, the heavy, outer part of the bone found around the whole body and legs, experiences a loss of about 0.3 to 0.4 percent per month. For comparison, a healthy adult on Earth loses 3 percent of cortical bone structure over the course of a decade -- an astronaut could lose that much in less than a year in space.
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