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. 2015 Oct 27;5:15717. doi: 10.1038/srep15717

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The analysed HRV indexes are: (a) Interbeat-intervals (RR); (b) Variability of the interbeat-intervals (RR) as expressed by their standard deviations (SDRR); (c) Power spectral density (PSD) of the RR intervals in the low- (LF) and high-frequency (HF or RSA). The whiskers represent +/−1 SEM.