Research HRV 17+

The 'Research HRV' app allows you to measure the heart rate variability of athletes of various specializations to determine their functional status.
The app does not provide recommendations or medical diagnoses. The results obtained can be used exclusively for educational and sports activities. The user should note that if there is a need to obtain a medical opinion on their health condition, they should consult a doctor.
To use the app, you can use a heart rate monitor with the ability to record R-R intervals and Bluetooth support (for example, Polar H10).
The application allows you to record in 3, 5, and 10 minutes (you can set it in the 'Settings' section). At the end of the recording, you will hear a beep and the recording will stop. When the recording is finished, you will be prompted to enter information about the performer and save the measurement result.
The report on heart rate variability measurements will be presented in a tabular form in CSV format.
You can also perform a 'Measurement search' sort. You can use keywords to select the measurements you need for analysis.
To get information about an individual measurement, click on the corresponding date, and you will be taken to the next screen.
On this screen, you can see a graphical representation of the heart rate dynamics and the result of the correction of possible artifacts ('R-R Artifact Correction'). The settings for R-R interval correction (median filter) can be set in the 'Setting' section.
You can also select any measurement range and get a report on this segment of heart rate variability. If you click on the 'Array (R-R)' button, you can access the array of R-R intervals and save it in CSV format.
To analyse the heart rate variability, a graphical display of the dynamics (histogram, scatterplot) and the main parameters will be presented, namely: Baevsky's stress index, Square root of Baevsky's stress index, Vegetative Balance Index, Mean HR (bpm), Mean R-R (ms), V(X) (dispersion, ms), SDNN (ms), RMSSD (ms), pNN50 (%), CV (coefficient of variation, %), R (range of variation, ms), Ratio of maximum to minimum, Moda (ms), AMo (%), SD1 (ms), SD2 (ms), SD2/SD1.