Hexoskin automatically calculates HRV values during a rest activity or a sleep activity only.
In fact, based on the literature, HRV values can only be accurately and meaningfully measured during a period with minimal activity and movement. Indeed, it was reported that activity and movement can cause outliers in the ECG signal and then bias the HRV calculation and interpretation (please refer attached document Hexoskin-MeasureHRV).
During a rest activity or by performing a "5 Minutes Rest Test" (under the section Fitness Tests on the Hexoskin App), Hexoskin will automatically provide you with an RMSSD value.
During a sleep activity, Hexoskin calculates automatically all the other HRV values:
- HRV AVNN
- HRV ASDNN
- HRV SDANN
- HRV SDNN
- HRV HF norm statistics (min, max, avg)
- HRV Total Power of NN interval
- HRV RMSSD
- HRV HF avg
- HRV LF avg
- HRV LF norm avg
- HRV Triangular index
If you want to perform relevant HRV analysis during a wake period, you will need to download your data under Binary format and do your analysis by eliminating the outliers in the ECG signal.
You can use the software HxConvertSourceFile to download multiples files at the time.
On the software, please tick the box "Use Tab '\t' delimiter (used by Kubios) [default is comma ',' delimiter]" when downloading files to open in an HRV analysis software, such as Kubios.
You will then use the NN_interval files to perform your HRV analysis. If you need help or assistance, feel free to contact our Support Team at firstname.lastname@example.org.
Keywords: heart rate variability, HRV measurement, value, nn interval, rr interval