USER'S GUIDE - Biosignal Analysis and Medical Imaging Group

4.2. The user interface 39Figure 4.6: The analysis options segment of the user interface.Figure 4.7: The results view segment of the user interface: time-domain results view selected.bottom left corner of the user interface. When unchecked, one or more changes to optionscan be made without updating breaks and when finished with changes the Apply buttoncan be pressed to update the results.The time-domain results view shown in Fig. 4.7 displays the time-domain variables in atable and the RR interval and heart rate histograms in the two axes. Most of the results arecalculated from the detrended RR series (if detrending is applied), but there are two obviousexceptions (i.e. mean RR interval and mean HR) which are marker with the ∗ symbol.The frequency-domain results view shown in Fig. 4.8 displays the results for both FFTand AR spectrum estimation methods. Both methods are applied to the detrended RRseries. The spectra of the two methods are presented in the two axes (FFT spectrum on theleft and AR spectrum on the right). The frequency axes of the spectra are fixed to rangefrom 0 Hz to the upper limit of HF band plus 0.1 Hz. Thus, for the default frequency bandsettings the frequency axis range is 0–0.5 Hz. The power axes of the spectra, on the otherhand, can be adjusted with the options on the upper left corner of the frequency-domainresults view. The power axes can be selected to have either common or separate upperKubios HRV Analysisversion 2.0 betaBiosignal Analysis and Medical Imaging GroupDepartment of PhysicsUniversity of Kuopio, FINLAND