A HUMAN NECESSITIES
A61 MEDICAL OR VETERINARY SCIENCE; HYGIENE
A61B DIAGNOSIS; SURGERY; IDENTIFICATION
A61B5/00 Measuring for diagnostic purposes; Identification of persons
A61B5/02 Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
A61B5/024 Measuring pulse rate or heart rate
A61B5/02405 Determining heart rate variability