Levator ani muscle co-activation at term is associated with a longer second stage of labor in nulliparous women

What is it about?

Levator ani contraction during Valsalva maneuver, also known as levator ani muscle co-activation (diagnosed by demonstrating a reduction of anteroposterior diameter of the levator hiatus during Valsalva in comparison with rest) is a common and understudied phenomenon. We demonstrated that nulliparous women with co-activation have a longer second stage of labor

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