Effect of pushing techniques in birthing chair on length of second stage of labor.
D000328:Adult; D000773:Anesthesia, Obstetrical; D001945:Breathing Exercises; D036861:Delivery, Obstetric / Q000295:instrumentation*; D005260:Female; D005318:Fetal Heart / Q000502:physiology; D006339:Heart Rate; D006801:Humans; D007223:Infant; D007748:Labor Stage, Second; D007743:Labor, Obstetric; D005082:Physical Exertion; D011247:Pregnancy; D013997:Time Factors