Abstract
The active length-tension relationship in standard strips of human myometrium was studied using constant velocities of elongation to stretch the muscle and electrical stimulation to induce contraction. The position of the active tension maximum was not directly related to the length of the muscle but upon the tension developed in the passively stretched muscle. The position of the passive length-tension curve could be varied by changing the velocity of elongation, by sequential pulls, and by stress relaxation at a constant length. The peak of active tension occurred at a point on the passive tension curve of 15.0 Gm. ± 6.2 for the pregnant and 14.1 Gm. ± 7.6 for the nonpregnant uterus.
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