Like real weightlessness, this simulated version can weaken muscles and bone.

The guidelines said bed rest, if prescribed at all, should last no longer than four days because it can weaken muscles and bones, delaying recovery.

The consequences could be a reduced ability to respond to stress or weakened muscles, the researcher said.

But don't make a habit of stopping your urine when you pee, as it can actually weaken muscles.

Botulinum toxin can weaken muscles in or near the injection area, states a journal editorial.

Long-term use of corticosteroids causes significant side effects, including a weakened immune system and weakened muscles.

Weakened abdominal muscles caused by pregnancy or abdominal surgery.

For these people, defective urinary organs, weakened muscles, descending bladders and other physical problems make voluntary control difficult around the clock.

Poor nutrition, smoking, and overexertion all can weaken muscles and make hernias more likely.

Too much inactivity weakens muscles and can increase joint pain.