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Table 2 The R2 and significance of cubic regression between the level of salivary cortisol and HRV features in the 98 tests

From: The persistent effect of acute psychosocial stress on heart rate variability

  RR SD of RR HR PVLF PHF SD1 of PP α1 of DFA
Cortisol R 2 0.225 0.129 0.26 0.29 0.162 0.194 0.13
Sig 0.000 0.008 0.000 0.000 0.002 0.000 0.008
  1. RR time between beats, HR heart rate, PVLF percentage of very low frequency to all frequency, PP Poincaré plot, DFA detrended fluctuation analysis