1 The rate at which the unstable radioactive C-14 isotope decays into the stable non-radioactive N-14 isotope, 2  The ratio of C-12 to C-14 found in a given specimen,  And the ratio C-12 to C-14 found in the atmosphere at the time of the specimen's death.
Regaining muscle after atrophy should be done under the guidance of a physician and physical therapist to prevent any further injury, which may result in even greater atrophy. It is important that you consult with a physician to determine the exact reason for your muscle atrophy.ractice patience and start slowly. One of the biggest challenges that you may face while attempting to rebuild muscle is overcoming the realization that your body is not physically capable of the feats it used to be prior to atrophy. You will have to gradually work up to your fitness goals again.
Muscles atrophy at different rates depending on a person's fitness level and both the intensity and regularity of their training prior to becoming inactive. In people who are new to exercise, strength can be lost in a mere two weeks from becoming inactive. If you've had a regular routine for a year or more, though, going up to four weeks to detrain can be beneficial in allowing muscles to fully repair from any minor damages without significant strength loss. Four months, though, would be excessive and probably result in noticeable strength loss.