Spinal muscular atrophy (SMA) is a genetic condition that weakens muscles throughout the body. This makes it difficult to move, swallow, and in some cases breathe. SMA is caused by a gene mutation ...

When you picture different athletes—marathon runners, gymnasts, and Olympic weightlifters, for example—you likely categorize them instinctively by their height, size, and build. But the differences in ...

Fast-twitch fibers help with explosive movements like sprinting and weight lifting. Genetics and training influence the distribution of fast-twitch and slow-twitch muscle fibers. Doing strength ...

An anti-smooth muscle antibody (ASMA) test is a blood test that detects autoantibodies that attack the smooth muscle cells in the body, often in the liver. Autoantibodies are antibodies made by your ...