How are the normalized units calculated when using the HRV Analysis Module Power Band Spectrum (HF, LF, VLF)?

In the LabChart HRV Module, the normalized units for LF are calculated with the following Equation:


100.0 * LF Power / (Total Power - VLF Power)


This means that we multiple the low frequency power (us^2) by 100.0. We then divide by the result of total power (us^2) minus the very low frequency power (us^2)


The normalized units for HF are calculated with the following Equation:


100.0 * HF Power / (Total Power - VLF Power)


If you have further questions or concerns about this, please contact your local Technical Support Representative by completing the online form located HERE.