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Related Experiment Videos

Individual differences in respiratory sinus arrhythmia.

Samia Ben Lamine1, Pascale Calabrese, Hélène Perrault

  • 1Laboratoire PRETA-TIMC, Faculté de Médecine de Grenoble, Université Joseph Fourier, 38700 La Tronche, France.

American Journal of Physiology. Heart and Circulatory Physiology
|January 31, 2004
PubMed
Summary

Respiratory sinus arrhythmia (RSA) varies between individuals. Longer spontaneous breathing periods correlate with reduced RSA amplitude increase and greater RSA delay curvature when breathing is altered, suggesting individual breathing patterns influence heart rate modulation.

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Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Function

Background:

  • Respiratory sinus arrhythmia (RSA) reflects heart rate variability influenced by breathing.
  • Interindividual differences in RSA responses to altered breathing patterns are not fully understood.

Purpose of the Study:

  • To investigate individual differences in respiratory sinus arrhythmia (RSA) characteristics.
  • To determine how imposed breathing periods affect RSA in healthy subjects.
  • To explore the relationship between spontaneous breathing patterns and RSA responses.

Main Methods:

  • Recorded ventilation and electrocardiogram in 12 healthy subjects.
  • Analyzed R-R interval signals using spectral analysis and breath-by-breath sinusoidal fitting.
  • Quantified RSA amplitude and delay across various imposed breathing periods (T(TOT)).

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Main Results:

  • RSA amplitude showed a linear relationship with T(TOT), while RSA delay exhibited a parabolic relationship.
  • Individual parameters for these relationships varied significantly.
  • Longer spontaneous breathing periods were associated with a lesser increase in RSA amplitude and greater curvature in RSA delay as breathing periods changed.
  • Transfer function analysis indicated interindividual differences in autonomic heart rate modulation.

Conclusions:

  • Individual spontaneous breathing periods partially explain RSA characteristic changes with altered breathing.
  • Significant interindividual variability exists in autonomic modulation of heart rate, as reflected by RSA responses.