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Figure 13: Automatic Sensor GainEstella Pulse Generators Technical Manual 637.7.3 Sensor ThresholdThe effects of rate adaptation are limited to sensor signals exceeding theprogrammable sensor threshold. Sensor signals below this thresholddo not affect rate response (Figure 14). The programmable sensorthreshold ensures that a stable rate at rest can be achieved by ignoringsensor signals of low amplitude that are not related to exertion.If the pacing rate at rest is unstable, or tends to stay above the lowerrate without activity, the sensor threshold should be increased. Thesensor threshold should be reduced if a sufficient rate increase is notobserved at a given level of exertion.Figure 14: Effect of sensor threshold7.7.4 Rate IncreaseThe rate increase parameter determines the maximum rate of changein the pacing rate if the sensor signal indicates increasing exertion(Table 19). In DDDR, VDDR, DOOR, VVIR, VOOR, AAIR and AOOR, a rateincrease setting of 2 ppm per second increase in pacing rate would take45 seconds to change from a pacing rate of 60 ppm to 150 ppm.