Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

You're relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it's a muscle in your arm, your leg, or ...

Researchers report in a study of muscle pump action in the context of chronic lower-limb edema. They found that body posture and exercise habits affect the blood pumping action of muscles in the leg, ...