An arrangement for detecting a heart beat and calculating heart rate on the basis of the detected heart beats, comprising means for measuring an EKG signal from a person's hands, a computer for detecting a heart beat from the measured signal and for performing a rationality analysis to verify a heart...http://www.google.com.au/patents/US6584344?utm_source=gb-gplus-sharePatent US6584344 - Method and apparatus for measuring heart rate
