to the end of the same contraction.
*Resting tone: a measure of how relaxed the uterus is between contractions. With external monitoring, this necessitates the use of palpation to determine relative strength. With an IUPC, this is determined by assessing actual pressures as graphed on the paper.
*Interval: the amount of time between the end of one contraction to the beginning of the next contraction.

The NICHD nomenclature defines uterine activity by quantifying the number of contractions present in a 10-minute