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. 2017 Sep 19;13:1223–1231. doi: 10.2147/TCRM.S143809

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© 2017 Reimer et al. This work is published and licensed by Dove Medical Press Limited

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Typical three-dimensional chart of a spectral analysis of heart-rate variability during orthostatic load in the cardiac autonomic reactivity group.

Notes: Standing augmented the low-frequency power (0.05–0.15 Hz) and reduced the high-frequency power (0.15–0.4 Hz) in T2 due to baroreceptor unloading and reduced vagal activity. High-frequency power was augmented in the repeated supine position in T3. The frequency of fluctuations in R-R intervals (Hz) is given on the x-axis; power spectral density (PSD; ms²/Hz) on the y-axis; and time (s) on the z-axis. T1: supine-1, T2: standing, T3: supine-2.