We used detrended fluctuation analysis (DFA), which was originally developed by Peng et al. (1995) to check power-law characteristics, to study the heartbeats of various subjects. Our purpose was to determine whether DFA is a useful method for the evaluation of a subject’s quality of recovery from cardiovascular-related illness and transition to a normal healthy state. Here, we report on subjects who underwent rehabilitation thermal therapy, subjects who developed premature ventricular contractions, and other subjects, including healthy subjects. The perceived level of wellness varies among subjects because the physiology of no 2 individuals is identical. However, several case studies have shown how wellness of subjects can be evaluated using heartbeat recordings. We conclude that DFA is a new, useful numerical method for quantifying the degree of wellness and the transition from sickness to wellness.

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