Method for recognizing heartbeat and for calculating quantities acquired from that

The present invention relates to a method for recognizing and measuring heartbeat, in which method individual heartbeats are recognized and measured from the electrical signal of the heart, the ECG signal, on the area of waist and/or on the body area below the waist by means of two or more electrodes (2, 3) integrated to an outfit (1) or to a part of an outfit and/or by means of two or more electrodes integrated to one or several wearable sensors, and for calculating various quantities describing the function of the heart. In the method in accordance with the invention, for recognizing and measuring heartbeat, the signals received from the heart are processed and examined with two or more different ways for improving the reliability of calculation and for decreasing the impact of noises and disturbances.