--- title: Difference between RR interval and NN interval description: The RR interval represents the time between each detected heartbeat, measured from peak (R) to peak (R) on the QRS complex. The NN interval represents the RR interval data but with added filtering to --- [Skip to content](https://support.hexoskin.com/difference-between-rr-interval-and-nn-interval#main-content) - [English](https://support.hexoskin.com/difference-between-rr-interval-and-nn-interval) - [Français](https://support.hexoskin.com/fr/différence-entre-les-intervalles-rr-et-les-intervalles-nn) English Show submenu for translations [More support](https://support.hexoskin.com/kb-tickets/new?hsLang=en) [![Hubspot - Hexoskin Logo - Rectangle](https://support.hexoskin.com/hubfs/Hubspot%20-%20Hexoskin%20Logo%20-%20Rectangle.svg)](https://support.hexoskin.com/?hsLang=en) Open main navigation Close main navigation - - [English](https://support.hexoskin.com/difference-between-rr-interval-and-nn-interval) - [Français](https://support.hexoskin.com/fr/différence-entre-les-intervalles-rr-et-les-intervalles-nn) English Show submenu for translations - [More support](https://support.hexoskin.com/kb-tickets/new) - [Contact us](https://support.hexoskin.com/kb-tickets/new) [Contact us](https://support.hexoskin.com/kb-tickets/new?hsLang=en) How can we help you? - There are no suggestions because the search field is empty. 1. [Hexoskin Support Community](https://support.hexoskin.com/?hsLang=en) 2. [Hexoskin Support Topics](https://support.hexoskin.com/hexoskin-support-topics?hsLang=en) # Difference between RR interval and NN interval The RR interval represents the time between each detected heartbeat, measured from peak (R) to peak (R) on the [QRS complex](https://geekymedics.com/understanding-an-ecg/). The NN interval represents the RR interval data but with added filtering to remove artifacts and noise present in the data making some RR intervals unreliable. Below is a brief comparison of the 2 datatypes/data channels:  **RR interval: **Time between two detected heartbeats, calculated for every QRS event. - Method of calculation: The time difference between the QRS and the previous QRS. - Frequency: Async - Source data: QRS which is based on ECG - Quality: rrintervalstatus.csv - Unit: second ![](https://support.hexoskin.com/hubfs/RR-interval%20vs%20nn-interval-png.png) **NN interval: **Time (normalized) between two detected heartbeat detections, calculated for every QRS event. - Method of calculation: The time difference between the QRS and the previous QRS. - The NN interval is based on the RR interval where unreliable RR intervals are excluded. Moreover, an RR interval differing by more than 150 ms from the 5 adjacent intervals is also excluded. - Frequency: Async - Source data: ECG - Quality: nnintervalstatus.cvs - Unit: seconds More information on the data filtration of the NN interval can be found in our [API documentation.](https://api.hexoskin.com/docs/resource/datatype/) - [Hexoskin OneSync Software](https://support.hexoskin.com/hexoskin-onesync-software?hsLang=en#main-content) - [Hexoskin OneSync Advanced Features](https://support.hexoskin.com/hexoskin-onesync-software?hsLang=en#hexoskin-onesync-advanced-features) - [Hexoskin OneSync Basics](https://support.hexoskin.com/hexoskin-onesync-software?hsLang=en#hexoskin-onesync-basics) - [Hexoskin Data Analysis](https://support.hexoskin.com/hexoskin-data-analysis?hsLang=en) - [Hexoskin Support Topics](https://support.hexoskin.com/hexoskin-support-topics?hsLang=en#main-content) - [Hexoskin Mobile App](https://support.hexoskin.com/hexoskin-support-topics?hsLang=en#hexoskin-mobile-app) - [Hexoskin Articles](https://support.hexoskin.com/hexoskin-support-topics?hsLang=en#hexoskin-articles) - [Hexoskin Set-up and Configuration](https://support.hexoskin.com/hexoskin-support-topics?hsLang=en#hexoskin-set-up-and-configuration) - [Hexoskin Recorder](https://support.hexoskin.com/hexoskin-support-topics?hsLang=en#hexoskin-recorder) - [Hexoskin Troubleshooting](https://support.hexoskin.com/hexoskin-support-topics?hsLang=en#hexoskin-troubleshooting) - [Hexoskin FAQ](https://support.hexoskin.com/hexoskin-faq?hsLang=en#main-content) - [Frequently Asked Question for the Hexoskin community](https://support.hexoskin.com/hexoskin-faq?hsLang=en#frequently-asked-question-for-the-hexoskin-community) - [Order](https://support.hexoskin.com/hexoskin-faq?hsLang=en#order) - [Hexoskin OneView dashboard](https://support.hexoskin.com/hexoskin-oneview-dashboard?hsLang=en) - [Hexoskin OneSync](https://support.hexoskin.com/hexoskin-onesync?hsLang=en) - [Hexoskin Smart Garments](https://support.hexoskin.com/hexoskin-smart-garments?hsLang=en#main-content) - [Hexoskin Device](https://support.hexoskin.com/hexoskin-smart-garments?hsLang=en#hexoskin-device) - [Hexoskin App](https://support.hexoskin.com/hexoskin-app?hsLang=en) - [Hexoskin Dashboard](https://support.hexoskin.com/hexoskin-dashboard?hsLang=en) - [Help for Developers](https://support.hexoskin.com/help-for-developers?hsLang=en) - [Ordering Your Hexoskin](https://support.hexoskin.com/ordering-your-hexoskin?hsLang=en) - [Hexoskin Support](https://support.hexoskin.com/hexoskin-support?hsLang=en) [![Hexoskin - Logo - No Tagline - Rectangle - White - Transparent-Nov-28-2023-04-38-48-1716-PM](https://support.hexoskin.com/hs-fs/hubfs/Hexoskin%20-%20Logo%20-%20No%20Tagline%20-%20Rectangle%20-%20White%20-%20Transparent-Nov-28-2023-04-38-48-1716-PM.png?width=200&height=50&name=Hexoskin%20-%20Logo%20-%20No%20Tagline%20-%20Rectangle%20-%20White%20-%20Transparent-Nov-28-2023-04-38-48-1716-PM.png "Hexoskin - Logo - No Tagline - Rectangle - White - Transparent-Nov-28-2023-04-38-48-1716-PM")](https://hexoskin.com) 5800, Saint-Denis, Suite 601, Montréal (Québec), Canada Copyright © 2026, Hexoskin