Can power spectrum analysis of heart rate variability assess changes in sympathovagal balance during graded orthostatic tilt?
Spectral analysis of heart rate variability using nu or LF-to-HF ratio provides a noninvasive method to quantitatively evaluate sympathovagal balance changes.
Spectral analysis of HRV, using nu or LF-to-HF ratio, appears to be capable of providing a noninvasive quantitative evaluation of graded changes in the state of the sympathovagal balance.
Montano et al. (Sat,) studied this question.