The present invention provides a biofeedback system and method for the purpose of allowing a human subject to consciously synchronize one’s rhythm of breathing with one’s natural heart rhythm for purposes of maximizing coherence of one’s heart rate variability pattern and consequent enhancement of physiologicalpsychological well being. The polymeric PTC compositions are readily blended and generally do not require cross-linking, particularly radiation induced cross-linking in order to manufacture useful products. In this case the metal plating helps prevent separation of the protrusions from the swage mount, thereby helping to prevent contamination. The first and second tamps may be locked together in fixed axial relationship to prevent relative axial movement between the first tamp and the second tamp while the first tamp is moved to impaction graft the first canal portion before impaction grafting the first canal portion. For acquiring the positional change, a dataset of at least one of the navigator echos is compared to the reference dataset.