Yet a further feature of {HEAD ~ 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 {TAIL ~ such rate zone}, as a function of a sensed physiologic parameter of the patient, such a physical activity, which physiologic parameter provides an indication whether the sinus heart rate is expected to change 
Yet a further feature of { HEAD ~ 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 { TAIL ~ such rate zone } , as a function of a sensed physiologic parameter of the patient , such a physical activity , which physiologic parameter provides an indication whether the sinus heart rate is expected to change
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