Patent ID: 9724023
Date: 2017-08-08
CPC Classifications: A61B

Claim:
1. A metabolic physical activity monitor comprising: at least one water-impermeable, gas-permeable, chemically-reactive skin sensor having at least one surface that is configured to contact a measurement site on a body surface of a subject; said at least one water-impermeable, gas-permeable, chemically-reactive skin sensor comprising a chemical indicator that exhibits a predictable color responsive to a corresponding CO2 concentration at least in sweat emitted from the subject's skin at the measurement site; at least one light source for illuminating the measurement site; at least one image capturer for detecting light reflected by said at least one chemically-sensitive skin sensor; at least one signal transmitter that transmits detected light to an A/D convertor for conversion to digital data representative of the detected light; a processor; at least one memory device storing the digital data representative of the light given off by said at least one chemically-sensitive skin sensor stored therein; said at least one memory device further comprising previously-collected calibration data mapping hue values to caloric expenditure values; said at least one memory device further comprising computer program code for: