Global link between heart rate and blood pressure oscillations at rest and during mental arousal in normotensive and hypertensive subjects

Luigina Guasti, Cinzia Simoni, Luca Mainardi, Chiara Crespi, Mariagrazia Cimpanelli, Catherine Klersy, Giovanni Gaudio, Anna M. Grandi, Sergio Cerutti, Achille Venco

Research output: Contribution to journalArticlepeer-review

Abstract

Complex phenomena modulate the interplay between heart rate and blood pressure variability, in particular after adjustments induced by stimuli or in pathophysiological conditions. This study sought to investigate in 25 hypertensive and 16 normotensive male subjects whether relationships operating at rest may be preserved after a central nervous system arousal induced by a mental stress test. As a secondary endpoint, we evaluated the potential changes of the components of heart rate and blood pressure variability during stress. Results: A significant correlation was observed between components of RR and systolic blood pressure (SBP) variability (p <0.0001), after controlling for the subject's status (normotensive vs. hypertensive) and for stress-steps (baseline condition, during stress test and recovery). Moreover, the multiple regression model accounted for the potential effects of the baseline alpha LF value and for the baseline heart rate and systolic blood pressure. The relationship operating between the LF/HFRR ratio and LF/HF SBP ratio was not different either at the different steps of stress test (interaction: p = 0.87) or in the two groups of normotensive and hypertensive subjects (interaction: p = 0.76). The variables of RR and SBP variabilities were modified during stress and recovery. In particular, the LF/HFRR ratio and LF/HFSBP ratio increased during stress and decreased during recovery. Conclusions: The association between heart rate and blood pressure oscillations was preserved during central nervous system arousal by mental stress both in normotensives and hypertensives. A central integration may account for this constant relationship, the correlation being independent from baseline heart rate, blood pressure and baroreflex sensitivity.

Original languageEnglish
Pages (from-to)80-87
Number of pages8
JournalAutonomic Neuroscience: Basic and Clinical
Volume120
Issue number1-2
DOIs
Publication statusPublished - Jun 15 2005

Keywords

  • Arithmetic mental stress test
  • Hypertension-essential
  • Spectral analysis

ASJC Scopus subject areas

  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Endocrine and Autonomic Systems

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