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Cardiorespiratory coordination reveals training-specific physiological adaptations.

S Garcia-Retortillo1,2, M Gacto1, T J O'Leary3

  • 1University School of Health and Sport (EUSES), University of Girona, C. Francesc Macià 65, 17190, Girona, Spain.

European Journal of Applied Physiology
|June 13, 2019
PubMed
Summary
This summary is machine-generated.

High-intensity interval training (HIIT) and moderate-intensity training (CONT) similarly improved aerobic fitness. However, cardiorespiratory coordination showed distinct changes between HIIT and CONT, suggesting training-intensity specific adaptations.

Keywords:
Coordinative variablesEndurance trainingHigh-intensity interval trainingModerate-intensity continuous trainingPrincipal component analysis

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Area of Science:

  • Exercise Physiology
  • Cardiorespiratory Fitness
  • Training Adaptations

Background:

  • Cardiorespiratory coordination is crucial for efficient aerobic exercise.
  • Understanding how different training intensities impact coordination is important for optimizing endurance training programs.

Purpose of the Study:

  • To compare the effects of high-intensity interval training (HIIT) and volume-matched moderate-intensity training (CONT) on cardiorespiratory coordination and aerobic fitness.
  • To investigate if training intensity influences the changes in cardiorespiratory coordination.

Main Methods:

  • A randomized controlled study involving 20 adults undergoing 6 weeks of either HIIT or CONT.
  • Cardiorespiratory variables were analyzed using principal component (PC) analysis before and after the training period.
  • Changes in PC eigenvalues were compared between groups to assess cardiorespiratory coordination.

Main Results:

  • Both HIIT and CONT significantly improved aerobic fitness, with no between-group differences.
  • CONT led to a reduction in the number of PCs (indicating simplified coordination) both below and above the lactate turnpoint.
  • HIIT also reduced the number of PCs but only above the lactate turnpoint, with smaller changes in PC1 eigenvalues compared to CONT.

Conclusions:

  • While both training types enhance aerobic fitness similarly, they induce distinct changes in cardiorespiratory coordination.
  • These findings suggest that cardiorespiratory coordination responses are specific to training intensity.
  • Cardiorespiratory coordination may serve as a sensitive indicator of individual responses to endurance training.