<http://purl.org/dc/terms/description>
"When analyzing short term heart rate variability (HRV) signals using the FFT technique,\r\nthe linear trend appears to be perfect 1/f signals. The non-linear trend in short term HRV\r\nsignals produces the regression 1/f components. De-trending the data using a moving\r\naverage is an effective technique for removing the 1/f components. However, though\r\nremoving the trend may sometimes produce clearer spectral pictures of respiratory sinus\r\narrhythmia or the breathing frequency, it has little impact otherwise. The linear trend is\r\nfractal, but not chaotic. The 1/f components in the signal does not imply the signal fractal;\r\nnor does a fractal signal implies it chaotic. No evidence in the present research suggests\r\nthat the non-linear trend is fractal, nor is there evidence to suggest that the HRV signal is\r\nfractal, or chaotic."@en
<https://open.library.ubc.ca/cIRcle/collections/ubctheses/831/items/1.0087907>