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. 2014 Mar 24;5:118. doi: 10.3389/fphys.2014.00118

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Copyright © 2014 Carnevali and Sgoifo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Daily rhythms of (A) heart rate, (B) RMSSD, (C) spectral power in HF band (0.75–2.5 Hz) and (D) LF (0.2–0.75 Hz) to HF ratio in 4-month-old Wistar rats selectively bred for either high (HAB, n = 10) or low (LAB, n = 10) anxiety-related behavior. These values (reported as means ± SEM) were obtained by averaging multiple 2-min segments acquired every hour during the 12 h-light and 12 h-dark phases, as previously described in detail (Carnevali et al., 2014). Results of two-way ANOVA for repeated measures: group difference for RMSSD (F = 16.4, p < 0.01) and HF (F = 17.48, p < 0.01) values. Modified from Carnevali et al. (2014).