The lower threshold limit is automatically adjusted as {HEAD ~ a function} of {TAIL ~ an independently sensed physiological parameter} that predicts a normal or natural change in the heart rate 
of
The lower threshold limit is automatically adjusted as { HEAD ~ a function } of { TAIL ~ an independently sensed physiological parameter } that predicts a normal or natural change in the heart rate
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH