How the Threshold ”R” Influences Approximate Entropy Analysis of Heart-Rate Variability


Calculation of approximate entropy (ApEn) requires to select the correct threshold “r”. Previous studies recommended r to be between 0.1 and 0.25 times the signal standard deviation, and now r=0.2 is used in almost all HRV studies. Recently it has been claimed that for fast signal dynamics, r=0.2 may lead to erroneous conclusions, while r maximizing ApEn… (More)


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