Yet a further feature of the invention is to provide an implantable antitachycardia device that automatically adjusts its detection rate zone, e.g., by automatically adjusting the lower and upper limits of such rate zone, as {TAIL ~ a function} of a sensed physiologic parameter of the patient, such a physical activity, which {HEAD ~ physiologic parameter} provides an indication whether the sinus heart rate is expected to change 
Yet a further feature of the invention is to provide an implantable antitachycardia device that automatically adjusts its detection rate zone , e.g. , by automatically adjusting the lower and upper limits of such rate zone , as { TAIL ~ a function } of a sensed physiologic parameter of the patient , such a physical activity , which { HEAD ~ physiologic parameter } provides an indication whether the sinus heart rate is expected to change
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