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However, it is now well established that extensive periods of bedrest can cause harm to the rest of the body. The most obvious effects of long periods of immobility are seen in the musculoskeletal system, with the loss of muscle strength and endurance, and bone weakening. Bones undergo a progressive loss in mass through a condition known as disuse osteoporosis.
Some injuries and illnesses require that a person remain in bed and immobile until he is better. Not only can this be emotionally difficult for a person, especially one who is typically very active, it can also take a toll on the body. Each system is affected differently by a long period of immobility.