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High-Intensity Interval Training Combined with Different Types of Exercises on Cardiac Autonomic Function. An Analytical Cross-Sectional Study in CrossFit ® Athletes

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  • Michelle Teles Morlin

    (Exercise Physiology Laboratory, Faculty of Physical Education, University of Brasilia, Brasilia 70910-900, DF, Brazil
    SARAH Network of Rehabilitation Hospitals, Brasilia 70910-900, DF, Brazil
    GEAFS—Research Group on Physiology and Epidemiology of Exercise and Physical Activity, Brasilia 70910-900, DF, Brazil
    These authors contributed equally to this work.)

  • Carlos Janssen Gomes da Cruz

    (Exercise Physiology Laboratory, Faculty of Physical Education, University of Brasilia, Brasilia 70910-900, DF, Brazil
    GEAFS—Research Group on Physiology and Epidemiology of Exercise and Physical Activity, Brasilia 70910-900, DF, Brazil
    Laboratory of Physical Performance and Healthy, Faculty of Physical Education, Euro American University Center, Brasilia 70200-001, DF, Brazil)

  • Freddy Enrique Ramos Guimarães

    (Exercise Physiology Laboratory, Faculty of Physical Education, University of Brasilia, Brasilia 70910-900, DF, Brazil
    GEAFS—Research Group on Physiology and Epidemiology of Exercise and Physical Activity, Brasilia 70910-900, DF, Brazil
    Goiano Federal Institute, Campus Morrinhos, Morrinhos 75650-000, GO, Brazil)

  • Renato André Sousa da Silva

    (Laboratory of Physical Performance and Healthy, Faculty of Physical Education, Euro American University Center, Brasilia 70200-001, DF, Brazil)

  • Luiz Guilherme Grossi Porto

    (Exercise Physiology Laboratory, Faculty of Physical Education, University of Brasilia, Brasilia 70910-900, DF, Brazil
    GEAFS—Research Group on Physiology and Epidemiology of Exercise and Physical Activity, Brasilia 70910-900, DF, Brazil)

  • Guilherme Eckhardt Molina

    (Exercise Physiology Laboratory, Faculty of Physical Education, University of Brasilia, Brasilia 70910-900, DF, Brazil
    GEAFS—Research Group on Physiology and Epidemiology of Exercise and Physical Activity, Brasilia 70910-900, DF, Brazil
    These authors contributed equally to this work.)

Abstract

It is well established that endurance exercise has positive effects on cardiac autonomic function (CAF). However, there is still a dearth of information about the effects of regular high-intensity interval training combined with different types of exercises (HIITCE) on CAF. Objective: The aim of this study is to compare CAF at rest, its reactivity, and reactivation following maximal exercise testing in HIITCE and endurance athletes. Methods: An observational study was conducted with 34 male athletes of HIITCE (i.e., CrossFit ® ) [HG: n = 18; 30.6 ± 4.8 years] and endurance athletes (i.e., triathlon) [TG.: n = 16; 32.8 ± 3.6 years]. We analyzed 5 min of frequency-domain indices (TP, LF, HF, LFn, HFn, and LF/HF ratio) of heart rate variability (HRV) in both supine and orthostatic positions and its reactivity after the active orthostatic test. Post-exercise heart rate recovery (HRR) was assessed at 60, 180, and 300 s. Statistical analysis employed a non-parametric test with a p -value set at 5%. Results: The HG showed reduced HFn and increased LFn modulations at rest (supine). Overall cardiac autonomic modulation (TP) at supine and all indices of HRV at the orthostatic position were similar between groups. Following the orthostatic test, the HG showed low reactivity for all HRV indices compared to TG. After the exercise, HRR does not show a difference between groups at 60 s. However, at 180 and 300 s, an impairment of HRR was observed in HG than in TG. Conclusion: At rest (supine), the HG showed reduced parasympathetic and increased sympathetic modulation, low reactivity after postural change, and impaired HRR compared to TG.

Suggested Citation

  • Michelle Teles Morlin & Carlos Janssen Gomes da Cruz & Freddy Enrique Ramos Guimarães & Renato André Sousa da Silva & Luiz Guilherme Grossi Porto & Guilherme Eckhardt Molina, 2022. "High-Intensity Interval Training Combined with Different Types of Exercises on Cardiac Autonomic Function. An Analytical Cross-Sectional Study in CrossFit ® Athletes," IJERPH, MDPI, vol. 20(1), pages 1-13, December.
    • Handle: RePEc:gam:jijerp:v:20:y:2022:i:1:p:634-:d:1019772
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    References listed on IDEAS

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    1. Abdullah Alansare & Ken Alford & Sukho Lee & Tommie Church & Hyun Chul Jung, 2018. "The Effects of High-Intensity Interval Training vs. Moderate-Intensity Continuous Training on Heart Rate Variability in Physically Inactive Adults," IJERPH, MDPI, vol. 15(7), pages 1-10, July.
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