Why Do Muscles Twitch After a Workout?
Why do muscles twitch after a workout? The short answer, according to the LA Times, is lots of reasons. Want more specifics? The Times puts the question to Dr. John Su, a sports medicine physician at UCLA, who says twitching could be caused by insufficient energy in the muscles. According to Su, muscles need adequate energy for proper contraction and relaxation, and
a specific balance of electrolytes (such as sodium, potassium, calcium
and magnesium) to regulate electrical signals governing contraction of
the muscles. If either of these needs aren’t met, you may get a
cramp or twitching."
Joel Stager, a kinesiology professor at Indiana University in Bloomington, tells the Times that there could be a neural component. After intensive activity, the recovery process takes some time to be
complete. Chemical substances that act as neural signals causing the
muscles to contract must be recycled. Until they are, the muscle cells
remain "irritable" and may spontaneously contract.
Finally, the Times offers this advice: To reduce the chance of post-exercise twitching, warm up before working
out, gradually increase your workload, drink plenty of fluids,
incorporate stretching and keep muscles warm — tights can help.