Figure 3From: Normative references of heart rate variability and salivary alpha-amylase in a healthy young male populationCorrelation between sympathetic indicators of heart rate variability and salivary alpha-amylase. The left panel shows the correlation of log-transformed sAA to lnLF of HRV. The right panel shows the correlation of log-transformed sAA to ln(LF/HF) of HRV. There were no significant correlations between sAA and the sympathetic indicators of HRV.Back to article page