Maximum positive intrathoracic pressure is generated in:

A sneeze or a cough can generate a pressure of = + 30 and + 50 cm H2O. Blowing a trumpet can generate a pressure up to = + 80 cm H2O. Valsalva maneuvre (is a forced expiratory effo against closed glottis.) It can generate the pressure between = + 120 and + 150 cm H2O.