Figure 1
From: Mental fatigue caused by prolonged cognitive load associated with sympathetic hyperactivity
Correlations between visual analogue scale (VAS) value for fatigue and autonomic activities. Low-frequency component power/high-frequency component power ratio (LF/HF ratio; a) log-transformed LF/HF ratio (ln LF/HF ratio; b) obtained on a wave interval analyses using accelerated plethysmography in all the measurement points before and after the 8-hr fatigue and relaxation sessions. Spearman's (a) and Pearson's (b) correlation coefficients and p-values are shown.