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. 2018 Jul 12;9:922. doi: 10.3389/fphys.2018.00922

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Copyright © 2018 Choi and Shin.

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) and the copyright owner(s) 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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Result of non-linear HRV analysis according to the beat error rate. The number in the figure represents the beat error rate that begins a significant difference. The dark solid line, bright solid line, dark dashed line, bright dashed line indicate non-interpolated, NNI, LI, and CSI, respectively. (A) SD1, (B) SD2, (C) ApEn (▴, •,■, ▾) represent the position of error rates that start to have a statistically significant difference compared to the HRV variable derived with ectopic-free IBIs.