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

. 2021 Mar 23;12:632883. doi: 10.3389/fphys.2021.632883

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

Copyright © 2021 Storniolo, Cairo, Porta and Cavallari.

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

The grouped error bar graphs show the symbolic markers, namely 0V% (A). 1V% (B), 2LV% (C), and 2UV% (D) computed over the RR series as a function of the period of analysis (i.e., PRE, PLATEAU, and POST). Indexes were calculated over original (solid black bars) and surrogate data (solid white bars). Data are reported as mean plus standard deviation. The symbol § indicates p < 0.05 across periods of analysis within the same type of series (i.e., original or surrogate sequence). The symbol * indicates p < 0.05 between types of series within the same period of analysis.