Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2018 Sep 25;9:1338. doi: 10.3389/fphys.2018.01338

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2018 Niizeki and Saitoh.

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.

PMC Copyright notice

Representative profiles of the (A) EEG frequency decomposition, (B) extracted EEG δ-wave, (C) RRI, (D) breathing frequency (f_R), (E) amplitude of respiratory sinus arrhythmia (A_RSA), (F) phase coherence (λ) between RSA and respiration, (G) time-frequency representation (TFR) for the change in RRI by using a continuous wavelet transform, and (H) normalized high-frequency component (HF_n) of RRI fluctuation estimated from TFR in a 24-year-old man. The gray line in (B) indicates the amplitude of the EEG δ-wave and the blue line depicts the envelope. The dotted lines in (D) indicate the full width at 20% maximum of the power spectral density for breathing, which was used as the passband frequency for determination of RSA. The gray lines in (D–F,H) are respective values estimated from 20-s windows and the blue lines indicate general trends obtained by applying a median filter (2-min moving window).