A cardiac pacemaker having a pacing rate responsive to a control function of a physiological parameter indicative of activity levels. The coefficients of the function are automatically calculated and modified in response to the trend of the measured physiological parameter in order to correspond to the...http://www.google.de/patents/US5303702?utm_source=gb-gplus-sharePatent US5303702 - Automatic adjustment of the control function for a rate adaptive pacemaker
