I was reading about bone strength this weekend and started wondering what the average or rate of connective tissue loss is in different situations.
People that travel in Space in zero-G environments lose 1-2% of bone mass per month. Without exercise an Astronaut would lose 20% of muscle mass in 5-11 days.
Bed rest showed that you can lose up to 12% of muscle strength a week. 3-5 weeks and 1/2 of the normal strength may be gone.
Limb immobilization as little as 72 hours has been shown to lose 14 and 17% atrophy in type 1 and type 11 muscle fibers.
Nerve loss, such as peripheral nerve injury will lose up to 95% of muscle mass and be replaced with fat and connective tissue.
Age brings a loss of about 5% of muscle mass every 10 years if we don't exercise.
Easy to lose. Keep moving. Gravity is your friend.