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Heart Rate Variability Analysis

1. From the AcqKnowledge home screen select: Open a graph file, Graph file on Disk, and click OK
   1. This will allow you to access files directly from the UT: Drive
      
      
      
2. Minimize all channels except Channels Channel 9 that correspond corresponds to ECG signal, by clicking on the triangle icon on the left hand slide of the channel number. 
   
   
3. Autoscale waveform horizontally using the autoscale feature in the toolbar
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4. Go to Analysis → HRV and RSA → and select "Single-Epoch HRV - Spectral" from the options menu
   
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5. Customize your tachogram settings in the "Analysis- Heart Rate Variability" premenu to the following:   
   1. **Minimum & Maximum BPM settings are default settings**
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   2. The Frequency Band settings have been adjusted to their default settings following the guidelines set forth by the European Heart Journal. You will not need to modify any settings unless you want to compare results with published data.
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   3. Verify the PSD (Power Spectral Density) Options are set to Automatic
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   4. The Options tab allows us to the control the output from the analysis routine
      1. R-R interval table: Will give you the time interval or every single R-R interval
      2. Interpolated tachogram: this is the tachogram that the analysis is being performed on
      3. Show Spectrum: Shows graph on a new window
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   5. Click OK
   6. Notice how the "Transform Entire Wave" option has been pre-selected for you. This indicates that the analysis will run through the entire waveform
      
      
6. Acq will generate the following results:
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   1. Copy the HRV Analysis Results to your Clipboard for further analysis & click OK
      
      
7. Acq will now display your Power Spectral Density (PSD) graph
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8. The adjacent tab corresponds to the interpolated tachogram showing each of the R-R intervals for that particular waveform in seconds
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   1. *Consider Adjusting waveform for further analysis
      
      
9.  Return to your original waveform by clicking on the first tab. Your HRV Analysis Results from Item 6 above will now appear on your journal below. 
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10. This analysis may also be performed by Locating Human ECG complex boundaries in the Analysis tab