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Table 3 Heart rate variability indices at baseline and during session

From: Feasibility and safety of virtual-reality-based early neurocognitive stimulation in critically ill patients

  Session 1 p Session 2 p Session 3 p
Baseline Session Baseline Session Baseline Session
LFn, Md (IQR) 3.87 × 10−5 (2.08 × 10−4) 3.02 × 10−5 (8.64 × 10−5) 0.02 7.44 × 10−5 (4.68 × 10−4) 6.91 × 10−5 (3.79 × 10−4) 0.01 9.17 × 10−5 (5.31 × 10−4) 6.74 × 10−5 (3.85 × 10−4) 0.23
HF, Md (IQR) 1.63 × 10−3 (1.64 × 10−1) 6.48 × 10−5 (2.31 × 10−1) 0.65 2.84 × 10−5 (5.17 × 10−5) 2.64 × 10−5 (2.05 × 10−4) 0.03 6.94 × 10−5 (1.21 × 10−3) 6.19 × 10−5 (8.71 × 10−4) 0.11
Total, Md (IQR) 2.88 × 10−3 (1.64 × 10−1) 2.25 × 10−4 (2.32 × 10−1) 0.38 9.85 × 10−5 (4.31 × 10−4) 9.81 × 10−5 (6.43 × 10−4) 0.01 2.44 × 10−4 (1.46 × 10−3) 1.08 × 10−4 (2.26 × 10−3) 0.02
  1. LFn power in low-frequency band expressed in normalized units, HF power in high-frequency band expressed in adimensional units, Total total power expressed in adimensional units, Md median, IQR interquartile range
  2. p values for nonparametric Wilcoxon signed-rank test