heart beat measurement using dual axis accelerometer

i have a psoc kit consisting of a adxl322+/-2g dual axis accelerometer.i want to measure or count the heart beat and monitor it does anyone have any idea of how to start of with ? i have enclosed a schematic of the board available.

Well, for the clinical theory, Google: ballistocardiography
For your needs, maybe try Google'ing: ballistocardiography accelerometer

Ken