• Heart rate
• Body temperature
• Activity (body acceleration)

Heart rate
Heart rate measurement is based on the number of QRS complexes of the registered ECG signal. The QRS complex corresponds to the depolarization of the ventricles that causes ventricular contraction. Only QRS complexes that exceed a certain pre-set threshold during a pre-determined time interval will be counted. This counted number is translated to heart beats per minute. The implant is equipped with two flexible leads which have to be placed subcutaneously (according Lead II of Einthoven) to register the ECG signal.

Body temperature
The implant is equipped with a temperature sensor with a resolution of 0.02˚ Celsius for very accurate and reliable body temperature measurement.

Activity
An accelerometer inside the implant registers body acceleration if it crosses a programmable threshold. PhysioLinq counts the total of number of measurements exceeding the threshold during the measurement interval and sends the number to the receiver.