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Table 3 Day-to-day reproducibility of heart rate variability and salivary alpha-amylase

From: Normative references of heart rate variability and salivary alpha-amylase in a healthy young male population

  n Intraclass correlation coefficients
Heart period 417 0.67
lnHF 417 0.59
lnLF 417 0.50
ln(LF/HF) 417 0.54
SD of normal-to-normal intervals 417 0.56
Root mean square of successive differences 417 0.58
Raw sAA 430 0.56
Square root transformed sAA 430 0.61
Natural log-transformed sAA 430 0.60
  1. HF: high frequency component; LF: low frequency component; sAA: salivary alpha-amylase.