Fig. 5

Effects of experimental conditions on (A) respiratory cycle duration, (B) median RRI from cardiac signal, and (C) HRV MAD from cardiac signal. The distribution of data is displayed as boxplots (minimum, first quartile, median, third quartile, and maximum). Individual data points are superimposed on the plots, with lines connecting those corresponding to the same participant. *, p < 0.05; **, p < 0.01; ***, p < 0.001. AU, arbitrary units.