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Dissection of long-range heart rate variability

Controlled induction of prognostic measures by activity in the laboratory

^* Cardiovascular Research Group, University of Calgary, Calgary, Alberta, Canada

View larger version (38K): [in a new window]   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.

View larger version (24K): [in a new window]   Figure 2 Temporally localized contributions to standard deviation of sequential 5-min heart period mean values (SDANN) due to scripted activities. (Top panel) Heart period recordings from a control subject and patient during a scripted activity day. (Bottom panel) Contribution per 5-min epoch of each activity in each subject to overall SDANN.