title: The effect of breathing techniques on the end-tidal percentage of carbon dioxide and its importance during labour.
abstract: This experiment was undertaken to determine the connection between the breathing techniques practised in some methods of training for childbirth and the presence of certain undesirable side effects during labour. These symptoms, viz., dizziness, exhaustion, shortness of breath, "pins and needles", tremors and tetany, may be the result of hyperventilation and the ensuing hypocapnia (deficiency of CO2 in the blood) (Christophers, 1961).
authors.forename: D I
authors.initials: DI
authors.lastname: Booth