Inactivity-loss of muscle mass predominantly affects the lower-limb muscles
and is more rapid during the initial days/weeks of inactivity. The loss of
muscle mass affects the muscle strength and muscle power. After a period of
muscle disuse, younger people seem to have a relative greater magnitude of
muscle atrophy compared to older people, but older people seem to have a
diminished capacity to regain muscle size during subsequent exercise. In
addition, older people seem to have a larger decrease in rapid force capacity,