Which complication is a result of total inactivity?

Total inactivity leads to muscle atrophy, which is the wasting away or decrease in size of muscle fibers due to lack of use or exercise. When muscles are not engaged in regular physical activity, they do not receive the necessary stimulus to maintain their size or strength. This can result in significant muscle loss over time, affecting overall mobility and function.

Muscle hypertrophy, the opposite of atrophy, occurs from regular exercise, particularly resistance training, and leads to an increase in muscle size. Joint stabilization and increased flexibility typically result from regular activity and movement, as they require muscles and joints to be engaged and trained properly to withstand various activities. Therefore, the only option that correctly corresponds to the effects of total inactivity is muscle atrophy.