... we review previous applications of MMPF in clinical studies [15, 16], in which the ability and reliability of the method in assessing the CA from spontaneous BPBFV fluctuations during resting ... “Endogenous circadian rhythm in an index of cardiac vulnerability independent of changes in behavior,” Proceedings of the National Academy of Sciences of the United States of America, vol 101, no ... 1998 [21] W Huang, Z Shen, N E Huang, and Y C Fung, “Engineering analysis of biological variables: an example of blood pressure over day,” Proceedings of the National Academy of Sciences of the United...