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