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