A concentric contraction is a type of muscle activation that causes tension on your muscle as it shortens. As your muscle shortens, it generates enough force to move an object. This is the most ...

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.

A gush of water, being doubled over in pain, the head of your baby crowning. These are things many women picture when they think of labor. However, for most laboring women, these things take time and ...

Braxton Hicks contractions happen with all pregnancies to help your body prepare for labor. They might feel like a mild muscle spasm, tightening in your baby bump, or menstrual cramps. Not sure if you ...

A woman who is 30 weeks pregnant has just finished her morning walk. Suddenly, she feels her stomach tighten. A few hours later, it happens again. No pain — just a rock hard belly. Should she grab her ...