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