What is the term for the rhythmic tightening of the uterus during pregnancy?

The term that refers to the rhythmic tightening of the uterus during pregnancy is Braxton Hicks contractions. These are also known as practice contractions or false labor, as they serve as a way for the uterus to prepare for the actual labor process without indicating that labor has begun. Braxton Hicks contractions typically start in the second trimester and can become more noticeable as pregnancy progresses.

These contractions are irregular and usually not painful, which distinguishes them from true labor contractions. They allow the muscles of the uterus to practice tightening, helping to condition the body for the more intense and rhythmic contractions that occur during active labor. Understanding this concept is important for expecting mothers as it helps them differentiate between normal pre-labor sensations and signs that true labor may be beginning.