--- title: Automatic HRV Analysis description: Learn how Hexoskin automatically calculates Heart Rate Variability (HRV) during rest and sleep, what HRV metrics are available, and how to access advanced HRV data through the Hexoskin API. --- [Skip to content](https://support.hexoskin.com/automatic-hrv-analysis#main-content) - [English](https://support.hexoskin.com/automatic-hrv-analysis) - [Français](https://support.hexoskin.com/fr/analyse-automatique-de-la-vfc-hrv) 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/automatic-hrv-analysis) - [Français](https://support.hexoskin.com/fr/analyse-automatique-de-la-vfc-hrv) 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) # Automatic HRV Analysis ## Hexoskin calculates Heart Rate Variability (HRV) values automatically during rest or sleep activities. This guide explains how HRV is measured, what values are provided, and how to access additional HRV metrics through the API. Hexoskin automatically calculates HRV values **only** during **rest** or **sleep** activities. This is because HRV can only be accurately measured when there is **very little movement**. Movement introduces noise and outliers into the ECG signal, which can distort HRV calculations and their interpretation. ### Ways to Calculate HRV Using Hexoskin 1. **Rest Activity** - You can add a *Rest* activity in the Hexoskin app during a recording session. [Tagging an Activity during a Recording Session on the App](https://support.hexoskin.com/tagging-an-activity-while-recording-onesync?hsLang=en) - Alternatively, you can tag a *Rest* period afterward on the dashboard after syncing your data. [Tagging an Activity within a Record](https://support.hexoskin.com/tagging-an-activity-within-a-record-onesync?hsLang=en). Hexoskin automatically provides you with an **RMSSD** value after syncing. At least **5 minutes of rest** is needed for HRV calculation. 2. **5 Minute Rest Test** - Add this as a “Fitness Test” in the Hexoskin app. - You’ll be asked to rest for 5 minutes while lying on your back. - The **RMSSD HRV** value will be calculated once the data is synced. 3. **Sleep Activity** - Tag a Sleep activity in the app (or let Hexoskin detect one automatically with a minimum of 4 hours of sleep). - After syncing, the dashboard provides: - HRV HF (%) - HRV HF Norm Min (%) - HRV HF Norm Max (%) A minimum of **5 minutes of sleep** is required for HRV calculation. After syncing sleep data, you’ll also see additional HRV metrics in the **Statistics.csv** file when exported: - HRV(HF) (%) - HRV HF Norm Min (%) - HRV HF Norm Max (%) - HRV LF Norm Avg (%) - HRV LF Avg (ms²) - HRV HF Avg (ms²) - RMSSD (ms)   ### Additional HRV Metrics via API More HRV metrics are available through an [API request](https://support.hexoskin.com/requesting-api-keys?hsLang=en). To obtain API keys, contact **api@hexoskin.com**. The API provides: - SDNN ([Hexoskin metric](https://api.hexoskin.com/docs/resource/metric/) ID 180) - SDANN ([Hexoskin metric](https://api.hexoskin.com/docs/resource/metric/) ID 181) - AVNN ([Hexoskin metric](https://api.hexoskin.com/docs/resource/metric/) ID 182) - ASDNN ([Hexoskin metric](https://api.hexoskin.com/docs/resource/metric/) ID 183) - Triangular index ([Hexoskin metric](https://api.hexoskin.com/docs/resource/metric/) ID 185) - Total Power NN ([Hexoskin metric](https://api.hexoskin.com/docs/resource/metric/) ID 176) *(By using your developer keys, you agree to our API Terms and Conditions.)* ### HRV Analysis During Active Periods If you want to perform HRV analysis during **wake** or **active** periods, you must: - Upload your data in **binary format** - Use the [HxConvertSourceFile software](https://support.hexoskin.com/reporting-hexoskin-data-into-kubios-hrv-standard?hsLang=en) to download multiple files for the same user - Check the box “Use Tab ‘\\t’ delimiter (used by Kubios) \[default is comma ‘,’ delimiter\]” if you want to use **Kubios** for analysis Then, use the **RR\_interval files** for your HRV analysis. ![](https://support.hexoskin.com/hubfs/mceclip0-png-1.png) [mailto:support@hexoskin.com](mailto:support@hexoskin.com) If you need help, contact our support team at **support@hexoskin.com**. - [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