Container for determining body composition and method

An air volume measuring device to measure a residual lung volume in a body of a subject, the air volume measuring device comprising:

• a translucent expandable container with an open end and a closed end, the container having a length extending longer than its width;
• a semi-rigid strip coupled to the container to indicate when air pressure within the container is between a predetermined range;
• the container having a plurality of equally spaced radial demarcations extending from the closed end to the open end, a first of the demarcations to indicate a distance from a point below a bottom of a nose to the top of a head of the subject when the container is placed adjacent the subject, and a second of the demarcations to indicate a residual lung volume variable, when the semi-rigid strip indicates that air pressure within the container is between a predetermined pressure range, corresponding to a measured volume of air exhaled by the subject when the subject exhales air expanded within the body resulting from the subject moving from a deeper depth to a shallow depth in a pool of water after the subject empties air from its lungs into the pool at the deeper depth;
• and
• a lung volume electronic computing device to determine residual lung volume based on a reading of the at least one of the radial demarcations indicating the residual lung volume variable in response to the strip indicating the air pressure within the container is between the predetermined range, wherein the lung volume electronic computing device further comprises:
• circuitry to receive a) a determined ambient air pressure from an air pressure measurement device, b) a determined water density from a measurement device operative to measure water density of water in the pool, c) a measurement corresponding to the shallow depth of the subject, d) a measurement corresponding to the deeper depth of the subject, and e) the residual lung volume variable of the subject;
• and
• circuitry to determine a residual lung volume (V1) of the subject based on the received a) determined ambient air pressure, b) the determined water density, c) the measurement of the shallow depth, d) the measurement of the deeper depth, and e) the measured volume of any potentially remaining air exhaled by the subject (MVOA) at the shallow depth after exhaling air by the subject at the deeper depth.

An air volume measuring device to measure a residual lung volume in a body of a subject, the air volume measuring device comprising:

• a translucent expandable container with an open end and a closed end, the container having a length extending longer than its width;
• a semi-rigid strip coupled to the container to indicate when air pressure within the container is between a predetermined range;
• the container having a plurality of equally spaced radial demarcations extending from the closed end to the open end, a first of the demarcations to indicate a distance from a point below a bottom of a nose to the top of a head of the subject when the container is placed adjacent the subject, and a second of the demarcations to indicate a residual lung volume variable, when the semi-rigid strip indicates that air pressure within the container is between a predetermined pressure range, corresponding to a measured volume of air exhaled by the subject when the subject exhales air expanded within the body resulting from the subject moving from a deeper depth to a shallow depth in a pool of water after the subject empties air from its lungs into the pool at the deeper depth;
• a lung volume electronic computing device to determine residual lung volume based on a reading of the at least one of the radial demarcations indicating the residual lung volume variable in response to the strip indicating the air pressure within the container is between the predetermined range;
• and
• circuitry to determine the residual lung volume (V1) of the subject with the lung volume electronic computing device using the formula V1=P2*MVOA/(P1−P2), where P1 is an underwater pressure determined based on the deeper depth and the water density, where P2 is an underwater pressure determined at the shallow depth based on the measurement of the shallow depth and the determined water density, and where MVOA is the measured volume of any potentially remaining air exhaled by the subject at the shallow depth after exhaling air by the subject at the deeper depth.