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Table 2 Mean values of largest Lyapunov exponent and finger pulse wave amplitude

From: Evaluation of mental stress by physiological indices derived from finger plethysmography

  Lyapunov exponent (AU) Finger pulse wave amplitude (AU)
Pre-task 3.34 ± 0.75 210 ± 109
CWT-1 3.83 ± 1.36 93 ± 89
CWT-2 3.63 ± 1.31 103 ± 91
CWT-3 3.66 ± 1.36 109 ± 89
Post-task 3.61 ± 1.05 174 ± 87
  1. Values are given as mean ± standard deviation (n = 31). AU, arbitrary unit; CWT, Stroop color-word conflict test; post-task, rest period after CWT; pre-task, rest period before CWT. Significant differences (P < 0.001) were seen in all stages of finger pulse wave amplitude. (Wilcoxon signed-ranks test).