[Allostasis and Heart Rate Variability Analysis].

This paper reviews patterns of heart rate variability and mechanisms of allostasis. The paper focuses on traditional autonomic nervous system and brain-heart axis research, recent biological measurements, and ambulatory electrocardiogram (ECG) big data analysis. The importance of biological measurement of daily activities and the results of data-driven research that analyzes ECG big data will provide new insights into the use of bio-signals.