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SETTING ABSOLUTE HEART RATE (AHR) F. The last heart rate programming screen is Absolute Heart Rate (AHR). This number will usually be used if you are under the care of a physician for cardiac rehabilitation. The first programming screen for AHR shows three dashes “ ---------“ indicating that the AHR function is inactive. To skip the AHR programming sequence, simply press and hold the key for 2 seconds. G. If you wish to program the AHR function, simply press the key until the number you want app