Respiratory quotient (RQ) refers to the ratio of the volume of carbon dioxides versus the volume of oxygen that human body breathes in. However, measuring the volumes of expiratory oxygen and inspiratory carbon dioxides poses many difficulties. Theref...
Respiratory quotient (RQ) refers to the ratio of the volume of carbon dioxides versus the volume of oxygen that human body breathes in. However, measuring the volumes of expiratory oxygen and inspiratory carbon dioxides poses many difficulties. Therefore, we developed a new RQ measuring device that used an algorithm that obtained the respiratory quotient by the measurement of concentrations of oxygen and carbon dioxide during expiration independently from their expiratory and inspiratory volumes. A mouthpiece of the device is composed of a chamber and three valves that were used to obtain the concentrations of oxygen and carbon dioxide during expiration. It was designed in such a way that only expiratory air can enter the expiration chamber in which oxygen and carbon dioxide sensors are placed. The inlet and outlet valves of the chamber isolate external air. This study analyzed human metabolism on the basis of the measured respiratory quotient, weight, and height data.