Rate-adaptive cardiac pacemaker having a stimulation unit (110), the means for stimulation of the ventricle and / or of the atrium, with a sensor unit (110) for detecting the electrical activity of the ventricle and the atrium, for measuring the time interval (4) between an atrial event and a subsequent ventricular event (atrial - ventricular via line time avct _ m), with a computation unit, the a stimulation frequency as a function of the physiological load on the step calculated and plasticizers carrier to the stimulation unit, wherein the computation unit has a control unit (103), which the values for the stimulation frequency by means of a recursive differential equation (104) is calculated, wherein the control unit (103) as a controller input size of the of the sensor unit (100) measured time interval (4) and as a reference variable for the step of a plasticizers carrier specific reference value (5) can be pre-determined, and wherein the control unit (103) as a control variable outputs a stimulation frequency difference, which, by way of the recursive differential equation (104) is calculated, wherein the computation unit as the sum of the stimulation frequency difference and fundamental frequency of a stimulation frequency is calculated.
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