Testing healthy volunteers during cold stress and postural changes, researchers found that the coefficient of variation of baroreflex gain (IBS CV) remained stable while blood pressure and heart rate fluctuated dramatically. During orthostatic challenge, heart rate increased while blood pressure dropped and stayed low—contradicting the traditional model where baroreceptors should restore pressure to baseline. Similarly, cold stress elevated both heart rate and blood pressure simultaneously, opposite to what a pressure-defending system would produce. This challenges the foundational cardiovascular physiology assumption that arterial baroreceptors primarily defend a blood pressure set point. The findings suggest the autonomic nervous system may instead prioritize maintaining stable variability in the relationship between pressure and heart rate changes. This paradigm shift could revolutionize cardiovascular risk assessment, potentially making baroreflex gain variability a superior biomarker to traditional blood pressure or heart rate variability for predicting outcomes in hypertension and heart failure. However, this preprint awaits peer review, and the small sample size warrants cautious interpretation. If validated, this represents a fundamental reconceptualization of cardiovascular regulation with profound implications for clinical practice.