Wearable devices for noninvasive respiratory quotient monitoring via transcutaneous sensors and measurements

A smartwatch comprising:

• a wrist band comprising a luminescent sensor for transcutaneously measuring carbon dioxide;
• a luminescent sensor for transcutaneously measuring oxygen;
• and
• the luminescent sensors are configured to exchange data with the smartwatch via one or more communication interfaces including a wireless and/or a wired interface.

A method of measuring Respiratory Quotient (RQ) comprising:

• transcutaneously measuring a partial pressure of carbon dioxide with a wrist band comprising a luminescent sensor for transcutaneously measuring carbon dioxide, to calculate a volume of carbon dioxide based on the measured partial pressure of carbon dioxide;
• transcutaneously measuring a partial pressure of oxygen with a wrist band comprising a luminescent sensor for transcutaneously measuring oxygen, to calculate a volume of oxygen based on the measured partial pressure of oxygen;
• and
• calculating a Respiratory Quotient (RQ) by dividing the measured volume of carbon dioxide by the measured volume of oxygen.