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Related Experiment Videos

Estimation of baroreflex sensitivity using transfer function analysis: normal values and theoretical considerations

D Linden1, R R Diehl

  • 1Department of Neurology and Clinical Neurophysiology, Alfried Krupp Hospital, Essen, Germany.

Clinical Autonomic Research : Official Journal of the Clinical Autonomic Research Society
|June 1, 1996
PubMed
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Transfer function analysis (TFA) measures human baroreflex sensitivity (BRS) using heart rate and blood pressure oscillations. TFA reveals distinct transfer mechanisms across frequency bands and may complement standard autonomic function tests.

Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Function

Background:

  • Baroreflex sensitivity (BRS) is traditionally assessed via heart rate changes in response to blood pressure alterations.
  • Transfer function analysis (TFA) is an established method for quantifying BRS using physiological blood pressure oscillations and heart rate variability.

Purpose of the Study:

  • To investigate the application of TFA in assessing BRS across different frequency bands and body positions.
  • To explore the relationship between TFA-derived parameters and other measures of autonomic function.

Main Methods:

  • Continuous recording of heart rate and blood pressure in 50 healthy subjects using Finapres.
  • Performing TFA across mid-frequency (0.05-0.15 Hz) and high-frequency (0.15-0.33 Hz) bands in supine and tilted positions.

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Main Results:

  • TFA yielded gain and phase shift values consistent with prior research.
  • Phase shifts showed high correlation within the same frequency bands but not body positions, suggesting distinct transfer mechanisms.
  • Poor correlation was observed between TFA gain/phase values and other spectral measures or standard autonomic tests.

Conclusions:

  • TFA provides valuable insights into baroreflex sensitivity.
  • Findings suggest frequency-dependent differences in baroreflex transfer mechanisms.
  • TFA may serve as a complementary tool for comprehensive autonomic function evaluation beyond traditional BRS assessment.