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Study design. HRV: heart rate variability. None (A), Very Low (B), Low (C), Medium (D), Strong (E) and Very Strong (F) filters refers to the level of threshold-based artefact correction (i.e., Kubios filter). Graphs are examples of the same best 5 min period (of the whole heart rhythm recoding) that met the selection criteria after using different Kubios filters. RR: R-R intervals; S: seconds; min: minutes.
