Power spectral analysis of heart rate variability in the two groups of subjects

<p>HRV indices, expressed as mean (SD), in baseline conditions and during and in response to (Δ) provocative tests (active standing, paced breathing). Significant results are shown in bold typeface.</p>a<p>statistical analyses performed on log ₁₀ - transformed variable;</p>b<p>correction for multiple testing by means of the Benjamini-Hochberg procedure with a 5% False Discovery Rate (FDR);</p>c<p>adjustment for potential confounders by means of multiple linear regression (see text for details). NC: normal cognition (controls); MCI: mild cognitive impairment; n.u.: normalized units; LFn: low frequency power (normalized); HFn: high frequency power (normalized); LF/HF: LF to HF ratio; Δ standing: standing HRV index - baseline HRV index; Δ paced breathing: paced breathing HRV index - baseline HRV index.