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.

Muscle contraction headache is a type of tension headache that is associated with tightening of muscles in the head, which leads to the onset of pain. It is a common type of headache and may be ...

Should you focus on concentric or eccentric loading to build muscle and strength? We cover the benefits of both and how to prioritize them.

Muscle cramps aren’t always preventable, but there are steps you can take to lower your risk of experiencing them, Buchler says. It’s important to stay hydrated and maintain an appropriate ...

Huxley, A. F. & Niedergerke, R. Structural changes in muscle during contraction: Interference microscopy of living muscle fibres. Nature 173 , 971–973 (1954) doi:10.1038/173971a0.

Actomyosin is a protein complex composed of actin and myosin. It is found in muscle fibers where it plays a role in muscle contraction. Actin is one of the most abundant proteins in eukaryotes. It ...