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An illustration of the effect size of the time-domain variables including (a) Mean RR (ms), (b) SD of normal-to-normal intervals (ms), and (c) root mean square of the successive differences (ms); and frequency-domain variables including (d) low-frequency (LF) (n.u), (e) high-frequency (HF) (n.u), and (f) LF/HF ratio *WBV: Whole-body vibration, LMWL: Low mental workload, HMWL: High mental workload, WBV.LMWL: Combined WBV and LMWL, and WBV.HMWL: Combined WBV and HMWL
