Variance Delay Fuzzy Approximate Entropy

MATLAB implementation of variance delay fuzzy approximate entropy for heart rate variability (HRV) complex analysis.

Reference

Li Y, Wu S, Yang Q, Liu G, Ge L. Application of the Variance Delay Fuzzy Approximate Entropy for Autonomic Nervous System Fluctuation Analysis in Obstructive Sleep Apnea Patients. Entropy. 2020; 22(9):915.

Description

scripts

• main.m (script) : data processing and indices calculation.
• simulation_test.m (script) : nonlinear signal system model constructed to verify the feasibility of VD_fApEn for ANS analysis.
• significance_test.m (script) : significance test of HRV indices by one-way ANOVA.
• show_sample_RR.m (script) : display of typical R-R interval signals.
• show_psd.m (script) : display of power spectrum density of typical R-R interval signals.
• show_barplot.m (script) : display of bar-plot for indices comparison.
• show_param.m (script) : display of entropy-parameter graph for parameter selection.

functions

• MIX.m (function) : generate simulated nonlinear signals.
• MyfApEn.m (function) : compute fuzzy approximate entropy of an input R-R interval signal.
• MyVDfApEn.m (function) : compute variance delay fuzzy approximate entropy of an input R-R interval signal.
• N_points_interp.m (function) : perform interpolation on an input signal to obtain an N-point array.