Both space and ageing can cause atrophy of a "forgotten" muscle.

Muscle loss can creep up faster than you think. Whether it’s due to injury, life changes or simply taking a break from working out, the body begins to change almost immediately when you stop using it.

The loss of muscle mass, or muscle atrophy, is a relatively common condition in today's aging and increasingly sedentary societies. While the disuse of muscles is the most frequent catalyst for muscle ...