“…Studies which contributed to the understanding of the problem were originally related to interests in the rocking method of artificial ventilation in adults (Colville, Shugg, and Ferris, 1956) and in newborn infants (Avery and O'Doherty, 1962). Differences in the mechanics of breathing with different positions in adults have also been attributed to pressure effect from the abdominal viscera (Blair and Hickham, 1955;Attinger, Monroe, and Segal, 1956).…”