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Related Experiment Videos

Heart rate variability during exercise performed below and above ventilatory threshold.

Francois Cottin1, Claire Médigue, Pierre-Marie Leprêtre

  • 1Laboratory of Exercise Physiology and Genetics, Department of Sport and Exercise Science, University of Evry, Evry Cedex, France. francois.cottin@bp.univ-evry.fr

Medicine and Science in Sports and Exercise
|April 6, 2004
PubMed
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Heart rate variability (HRV) effectively distinguishes between exercise intensities below and above the ventilatory threshold. Exercise duration at higher intensities does not disrupt cardiorespiratory synchronization.

Area of Science:

  • Exercise Physiology
  • Cardiorespiratory Function
  • Autonomic Nervous System

Background:

  • Heart rate variability (HRV) reflects autonomic nervous system activity during exercise.
  • Distinguishing exercise intensity thresholds is crucial for training prescription and performance analysis.
  • Cardiorespiratory synchronization is a complex interplay between heart rate and breathing patterns.

Purpose of the Study:

  • To determine if heart rate variability (HRV) can differentiate between exercise below and above the ventilatory threshold.
  • To investigate the effect of exercise duration at supra-threshold intensity on cardiorespiratory synchronization.

Main Methods:

  • 11 healthy, well-trained subjects underwent two exercise tests: moderate-intensity (below ventilatory threshold) and heavy-intensity (above ventilatory threshold).

Related Experiment Videos

  • Beat-to-beat RR intervals, VO2, VCO2, VE, and blood lactate were measured.
  • Time-series analysis of RR intervals included Fast Fourier Transform and smoothed pseudo Wigner-Ville distribution.

    • Main Results:

    • Moderate exercise showed a prevalence of low-frequency (LF) HRV, while heavy exercise demonstrated a prevalence of high-frequency (HF) HRV.
    • During heavy exercise, breathing frequency increased, and mean RR intervals decreased, but cardiorespiratory synchronization (HR/BF ratio) remained stable.
    • Despite changes in breathing and heart rate, the synchronization between the RR interval series and the breathing signal was maintained.

    Conclusions:

    • HRV analysis is a valid method to distinguish between sub- and supra-ventilatory threshold exercise.
    • Exercise duration at supra-threshold intensity does not negatively impact cardiorespiratory synchronization.