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This study investigated correlation coefficients of all pairs in all eight indices derived from ECGs. The four indices of HRV, i.e. LF, HF, LF/HF and CV-RR, and the four parameters from the Poincare plot, i.e. length of the longitudinal axis (L), length of the transverse axis (T), CVI (=log LT) and CSI (=L/T), were used for the analysis. The ECGs of 98 participants during the performance of two mental tasks and two resting periods were measured. The results showed that there was no pair that had a high correlation coefficient through all four blocks; these coefficients were different for each block. In most pairs, there were no strong correlations in any block. These results suggest that indices that were reported to show the same autonomic nervous system activities in previous studies may actually provide different responses. It is noteworthy that the eight parameters derived from the same RR interval data reflected different responses.

E6(S)-3 Rest-Task differences in correlation coefficients between autonomic nervous system indices