A typical example of a
health monitoring application that uses the iPhone’s
internal sensors for physiological monitoring is
Heart fi tness. This application uses iPhone camera
and iPhone’s built-in fl ash light to process refl ection
from user’s fi ngertip in order to detect heart beats.
During measurement the instantaneous heart rate is
monitored in beats per minute (BPM) and the physiological
photoplethysmographic (PPG) signal is also
displayed [15].