Figure 1.

Changes in the three HRV parameters across the training. (A) Design of the ReSource project (reproduced with permission from⁴⁹): Three training cohorts undergo different types of mental training. Measurements are taken at every time point (x-axis). Δt between the time points = 3 months, total training duration = 9 months. A retest control cohort completes all measurements but does not undergo any training. (B) Variation in the three HRV parameters across the training period. ln ms = logarithm of milliseconds. vuLP_R = voluntary upregulation of Local Power, controlling for changes in respiratory period. (C) Variation in the three HRV parameters in the trained cohorts across the training period, split by the oxytocin receptor gene rs53576 polymorphism. *p < 0.05, for the interaction between time and training from T0 to Tn, tested within a linear mixed model (see Methods). Error bars indicate standard error of the mean. Number of participants per timepoint are given in Table 1 (for Panel B) and Supplementary Table S2 (for Panel C). Note that the T0 data of panel B have been previously reported in¹⁶. Data of the graphs can also be found as tables in the Supplementary Material, Section F.