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Inconsistent link between low-frequency oscillations: R-R interval responses to augmented Mayer waves.

J W Hamner1, R J Morin, J L Rudolph

  • 1Laboratory for Cardiovascular Research, Research and Training Institute, Hebrew Rehabilitation Center for Aged, Boston, Massachusetts 02131, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 15, 2001
PubMed
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Lower body negative pressure increased oscillations in blood pressure and heart rate variability. However, the link between these oscillations, mediated by the arterial baroreflex, was inconsistent across individuals and stimulus intensity.

Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Regulation
  • Baroreflex Sensitivity

Background:

  • Low-frequency oscillations in arterial blood pressure (Mayer waves) and R-R interval are linked via the arterial baroreflex.
  • Understanding this relationship is crucial for assessing autonomic function.

Purpose of the Study:

  • To investigate the relationship between arterial blood pressure oscillations and R-R interval oscillations under controlled lower body negative pressure (LBNP).
  • To determine how varying levels of LBNP affect baroreflex-mediated oscillations.

Main Methods:

  • 18 healthy young males were subjected to cyclic lower body negative pressure (LBNP) at 10 and 30 mmHg.
  • Arterial blood pressure and R-R intervals were continuously monitored.
  • Spectral analysis and cross-spectral coherence were used to analyze low-frequency oscillations.

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Main Results:

  • Oscillatory LBNP significantly decreased R-R interval but did not alter average blood pressure.
  • Low-frequency oscillations in blood pressure and R-R intervals were augmented in a graded response to LBNP.
  • Cross-spectral coherence between blood pressure and R-R interval oscillations was highly variable and decreased significantly under LBNP.

Conclusions:

  • The link between low-frequency oscillations in blood pressure and R-R intervals is complex and influenced by autonomic regulatory mechanisms.
  • Baroreflex sensitivity, as assessed by oscillation coherence, is variable and diminishes under LBNP.
  • These findings highlight the dynamic interplay of cardiovascular regulatory systems during altered loading conditions.