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Table 2 Correlation analysis of ultra-short HRV features vs equivalent short ones

From: Ultra-short term HRV features as surrogates of short term HRV: a case study on mental stress detection in real life

  Rest Phase Stress Phase
HRV Features 3 vs 5 min 2 vs 5 min 1 vs 5 min 30 s vs 5 min 3 vs 5 min 2 vs 5 min 1 vs 5 min 30 s vs 5 min
MeanNN 0.984 0.890 0.975 0.936 0.985 0.937 0.955 0.964
StdNN 0.954 0.875 0.905 0.749 0.962 0.912 0.791 0.640
MeanHR 0.984 0.891 0.975 0.947 0.985 0.938 0.954 0.964
StdHR 0.914 0.789 0.796 0.635 0.971 0.904 0.784 0.696
RMSSD 0.961 0.914 0.946 0.859 0.983 0.928 0.915 0.852
NN50 0.972 0.883 0.949 0.822 0.971 0.920 0.905 0.894
pNN50 0.967 0.882 0.943 0.818 0.969 0.915 0.913 0.881
LF 0.894 0.886 0.921 0.916
HF 0.915 0.906 0.901 0.925 0.915 0.798
LF/HF 0.830 0.839 0.846 0.807
TotPow 0.897 0.882 0.900 0.905
SD1 0.961 0.914 0.945 0.862 0.983 0.928 0.915 0.852
SD2 0.956 0.865 0.876 0.707 0.941 0.898 0.755 0.694
ApEn 0.771 0.169 0.918 0.790
SampEn 0.855 0.666 0.681 0.931 0.826 0.599
D2 0.922 0.674 0.330 0.967 0.876 0.816
dfa1 0.661 0.687 0.637 0.927 0.908 0.799
dfa2 0.633 0.611 0.673 0.767 0.563 0.485
RPlmean 0.837 0.708 0.645 0.901 0.730 0.503
RPlmax 0.738 0.588 0.583 0.896 0.737 0.678
REC 0.880 0.643 0.608 0.892 0.689 0.513
RPadet 0.852 0.645 0.495 0.948 0.817 0.642
ShanEn 0.795 0.661 0.614 0.907 0.720 0.463
  1. All the correlations resulted significant (prho < 0.05); in bold Spearman’s correlation coefficient (rho) greater than 0.7; −: not computable