Controversies in maternal effort during labor and delivery.
D001945:Breathing Exercises; D036861:Delivery, Obstetric; D005260:Female; D006801:Humans; D007748:Labor Stage, Second; D007743:Labor, Obstetric; D009321:Natural Childbirth; D005082:Physical Exertion; D011187:Posture; D011247:Pregnancy; D011312:Pressure; D012119:Respiration; D014636:Valsalva Maneuver