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Figure 2 (a) Representative power spectra of RR intervals during various recumbent positions in a normal subject and (b) a patient with CHF. In the normal subject, there were no significant differences in the normalized high-frequency power among the three recumbent positions. In contrast, in the patient with CHF, normalized high-frequency power was highest when the right lateral decubitus position was obtained, followed in decreasing order by the supine and left lateral decubitus positions. HF/total power = normalized high-frequency power; LF/total power = normalized low-frequency power; LF/HF = low-frequency/high-frequency power.
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