Sports Medicine & Kinesiology

Expert tips for reducing running injuries

(HealthDay)—Most runners are enthusiastic about their sport and take steps to work out safely. But injuries like stress fractures and muscle strains, among others, are common and can sideline you, sometimes for weeks if ...

Medical research

Researchers develop drug to rejuvenate muscle cells

Researchers from The University of Texas Medical Branch at Galveston have developed a promising drug that has proven to significantly increase muscle size, strength and metabolic state in aged mice, according to a study just ...

Neuroscience

Nerve transfer promising for acute flaccid myelitis patients

(HealthDay)—Two patients diagnosed with acute flaccid myelitis and upper-extremity neuropathy who were treated with peripheral nerve transfer continue to demonstrate functional recovery at two years, according to a case ...

Health

Surmounting that fitness plateau

(HealthDay)—Just as there are diet plateaus, you can hit the wall with exercise, too—no longer seeing results from your efforts and then losing motivation.

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Muscle

Muscle (from Latin musculus, diminutive of mus "mouse") is the contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to produce force and cause motion. Muscles can cause either locomotion of the organism itself or movement of internal organs. Cardiac and smooth muscle contraction occurs without conscious thought and is necessary for survival. Examples are the contraction of the heart and peristalsis which pushes food through the digestive system. Voluntary contraction of the skeletal muscles is used to move the body and can be finely controlled. Examples are movements of the eye, or gross movements like the quadriceps muscle of the thigh. There are two broad types of voluntary muscle fibers: slow twitch and fast twitch. Slow twitch fibers contract for long periods of time but with little force while fast twitch fibers contract quickly and powerfully but fatigue very rapidly.

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