An apparatus for managing ventilation in a locomotive ambulating user orally, the apparatus comprising: a front plate having a curved peripheral portion with an upper edge and a lower edge, the curved peripheral portion being sized and configured to fit between the user's teeth and lips or cheeks to inhibit ventilation by the user around the curved peripheral portion, the front plate having a post region that is substantially tubular and extends out of a central region of the front plate and in a direction toward inside the user's mouth when worn and a passageway that is positioned between the upper and lower edges and bounded by the curved peripheral portion and contained in the post region, and that is substantially orthogonal to a center portion of the front plate; an airway resistor removably inserted within the passageway of the front plate, the airway resistor having a tubular passageway with an aperture that is sized to allow a metered amount of air flow by the ventilation of the user; one or more sensors (305; 715) associated with the airway resistor, the one or more sensors (305; 715) including a pressure sensor (305; 715) to measure an air pressure in the aperture of the metered amount of air flow by the ventilation of the user, the pressure sensor (305; 715) being located at the distal end of the post region; a micro controller connected with the pressure sensor to generate measurement data based on the air pressure measured by the pressure sensor, the micro controller further being configured to format the measurement data for transmission via a wireless transmission medium; and a transmitter connected with the micro controller to transmit the measurement data via the wireless transmission medium to an external computer processor. a front plate having a curved peripheral portion with an upper edge and a lower edge, the curved peripheral portion being sized and configured to fit between the user's teeth and lips or cheeks to inhibit ventilation by the user around the curved peripheral portion, the front plate having a post region that is substantially tubular and extends out of a central region of the front plate and in a direction toward inside the user's mouth when worn and a passageway that is positioned between the upper and lower edges and bounded by the curved peripheral portion and contained in the post region, and that is substantially orthogonal to a center portion of the front plate; an airway resistor removably inserted within the passageway of the front plate, the airway resistor having a tubular passageway with an aperture that is sized to allow a metered amount of air flow by the ventilation of the user; one or more sensors (305; 715) associated with the airway resistor, the one or more sensors (305; 715) including a pressure sensor (305; 715) to measure an air pressure in the aperture of the metered amount of air flow by the ventilation of the user, the pressure sensor (305; 715) being located at the distal end of the post region; a micro controller connected with the pressure sensor to generate measurement data based on the air pressure measured by the pressure sensor, the micro controller further being configured to format the measurement data for transmission via a wireless transmission medium; and a transmitter connected with the micro controller to transmit the measurement data via the wireless transmission medium to an external computer processor.