Wavelet analysis of autonomic outflow of normal subjects on head-up tilt, cold pressor test, Valsalva manoeuvre and deep breathing.

@article{DuclaSoares2007WaveletAO,
  title={Wavelet analysis of autonomic outflow of normal subjects on head-up tilt, cold pressor test, Valsalva manoeuvre and deep breathing.},
  author={Jos{\'e} Lu{\'i}s Ducla-Soares and Mariana Santos-Bento and S{\'e}rgio Laranjo and Alexandre Jos{\'e} Aguiar Andrade and Eduardo Ducla-Soares and Jo{\~a}o P Boto and Lu{\'i}s Silva-Carvalho and Isabel Rocha},
  journal={Experimental physiology},
  year={2007},
  volume={92 4},
  pages={677-86}
}
Non-invasive autonomic evaluation has used fast Fourier transform (FFT) to assign a range of low (LF) and high frequencies (HF) as markers of sympathetic and parasympathetic influences, respectively. However, FFT cannot be applied to brief transient phenomena, such as those observed on performing autonomic tests where the acute changes of cardiovascular signals (blood pressure and heart rate) that represent the first and most important stage of the autonomic performance towards a new state of… CONTINUE READING