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Figure 1 Heart period recordings. (Top panels) Recordings from a 24-h day from a control subject (left) and heart failure patient (right). (Middle panels) Recordings from a 4-h scripted activity day from the same subjects. (Bottom panels) Recordings from a 4-h rest day from the same subjects. SDANN = standard deviation of sequential 5-min heart period mean values. ULFmag = ULF magnitude.
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