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

(A) Changes in breathing trace (Resp, upward deflections denote expiration) for a 20-s time window. (B) Time-frequency representation by CWT for breathing. (C) Mean power spectral density (PSD) profile in the normalized form. The corner frequencies of passband filter for determining RSA were estimated by the frequencies where PSD reduced to 20% of its maximum power (horizontal dotted lines). (D) Change in RRI (dotted curve) and extracted RSA (red curve). (E) Instantaneous phases for breathing (black line) and RSA (red line).