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Dermatomyositis and polymyositis are connective tissue diseases in which there is muscle weakness and tenderness. The two disorders are very similar, except that dermatomyositis involves the skin as well as the muscles, while polymyositis involves only the muscles. The major manifestation of polymyositis is inflammation leading to destruction of muscle and increasing muscular weakness. As the disease progresses, muscle tissue is replaced by functionless scar tissue. Both have features in common with rhematoid arthritis , lupus , and progressive systemic sclerosis ( scleroderma ). The causes of dermatomyositis and polymyositis are unknown. It appears that abnormal immunological factors are responsible for at least part of inflammatory attack against muscle tissue. The symptoms of muscular weakness usually wax and wane, but in some instances, the disease may progress rapidly. The disease may affect persons of any age, but the peak incidence is in the fifth and sixth decades of life. Women are ...
Injury to the anterior cruciate ligament (ACL) in the knee is really more than just a torn ligament. Along with damage to the ligament comes weakness of the quadriceps muscle. The quadriceps is the large muscle that comes down over the front of the thigh from the hip to the knee. Scientists are trying to unlock the puzzle of this muscle weakness. The muscle isn't wasting away, a condition called atrophy . So what could be causing this weakness? Is there some way that the ligament signals the muscle to contract in a normal knee? What other changes occur after a ligament is torn or damaged that could affect the muscle? Researchers at the University of Tokyo in Japan set out to answer these questions. They found signals that form a complete loop from knee joint to ligament to muscle. This is called afferent feedback . Before the experiment, scientists thought that damage to the ACL alters this loop. Decreased signals to the muscle cause the weakness. To prove this, they used vibration to the ...
Cramps are an inevitable part of almost every woman’s life. Each month, without fail, you feel your period before it begins. Cramps are usually felt in the abdomen or the lower back. They last anywhere from one to three days. For some women, cramps are merely a nuisance, something that is annoying but doesn’t affect your life. For other women, severe cramps send them to bed for a day or two each month. While you probably can’t totally rid your life of cramps, there are some things you can do to help ease the pain.
While you are having cramps:
Over-the-counter medications, such as ibuprofen or naproxen, usually help to lessen the pain.
Use a heating pad or a hot water bottle and apply heat directly to your abdomen or lower back.
Try different positions. You might find lying on your side with your knees bent helps relieve the pain or you might find another position feels better. Try sitting and lying down in different positions to find what works best for you.
You should know
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