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Respiratory variability in R-R interval during sinusoidal exercise

R Sone1, F Yamazaki, N Fujii

  • 1Institute of Health and Sport Sciences, University of Tsukuba, Ibaraki, Japan.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1997
PubMed
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Heart rate variability during exercise shows complex regulation. Cardiac parasympathetic activity influences heart rate responses differently during increases versus decreases in exercise intensity.

Area of Science:

  • Cardiovascular Physiology
  • Exercise Physiology
  • Autonomic Nervous System Regulation

Background:

  • Heart rate (HR) variability, specifically the R-R interval, naturally fluctuates with respiration.
  • Understanding how respiratory sinus arrhythmia changes during dynamic exercise is crucial for assessing autonomic control.

Purpose of the Study:

  • To investigate the relationship between R-R interval variability and respiration during sinusoidal cycle exercise.
  • To determine how changes in heart rate and exercise intensity affect respiratory sinus arrhythmia.

Main Methods:

  • 12 healthy young males performed sinusoidal cycle exercise (30 W to 60% maximal oxygen uptake) for 8 minutes.
  • R-R interval variations with respiration (delta RR) were analyzed in relation to heart rate and exercise intensity changes.

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Main Results:

  • The magnitude of R-R interval variation with respiration (delta RR) decreased as heart rate increased.
  • Delta RR decreased more significantly at lower heart rates during exercise intensity increases.
  • Delta RR tended to increase linearly during decreases in heart rate, being greater during decreases than increases at similar heart rates.

Conclusions:

  • Cardiac parasympathetic withdrawal is a more significant factor in heart rate increases at lower exercise intensities during sinusoidal exercise.
  • The cardiac parasympathetic system shows greater activation during heart rate decreases compared to increases at the same heart rate.
  • Complex heart rate regulation during sinusoidal exercise, influenced by heart rate level and direction of change, may involve cardiac sympathetic system modulation beyond parasympathetic activity.