Patent Document ID: 10078074
Application ID: 14761732
Patent Flag: 1

Claim One:
1. A system for measuring and tracking metabolic rate comprising: a mouthpiece having an inlet for the introduction of exhaled breath into a flow path; wherein the mouthpiece includes at least one orifice with a cross sectional area in the range of 4 mm 2 to 40 mm 2 in the flow path, and where the orifice is at least 50% smaller than the inlet cross sectional area; a colorimetric sensor providing a first output signal representing chemical measurements; a differential pressure sensor with a sensor inlet located on the inlet side of the orifice, where the differential pressure sensor provides a second output signal representing pressure measurements; and an adaptive sampling mechanism to detect and learn the user's natural breathing pattern to assist the user to perform consistent measurement, and to determine resting energy expenditure from pressure and chemical measurements, with pre-determined calibration curves that relate the first output signal representing chemical measurements to the chemical concentrations and the second output signal representing pressure measurements.