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. 2023 Mar 1;20(5):4430. doi: 10.3390/ijerph20054430

Figure 4.

Figure 4

Schematic representation of the 32 variables extracted from the power spectral density for each of the 8 time series that describe the respiratory and cardiac pattern. TI: inspiratory time, TE : expiratory time, TTot : duration of the respiratory cycle, VT : tidal volume, TI/TTot : inspiratory fraction, VT/TI : mean inspired flow, f/VT : frequency–tidal volume ratio, where f is the respiratory rate; RR: cardiac beat-to-beat interval.