Título:	High-intensity interval training combined with different types of exercises on cardiac autonomic function : an analytical cross-sectional Study in CrossFit® athletes
Autor(es):	Morlin, Michelle Teles Cruz, Carlos Janssen Gomes da Guimarães, Freddy Enrique Ramos Silva, Renato André Sousa da Porto, Luiz Guilherme Grossi Molina, Guilherme Eckhardt
ORCID:	https://orcid.org/0000-0002-9817-3158
Afiliação do autor:	University of Brasilia, Faculty of Physical Education, Exercise Physiology Laboratory SARAH Network of Rehabilitation Hospitals GEAFS - Research Group on Physiology and Epidemiology of Exercise and Physical Activity University of Brasilia, Faculty of Physical Education, Exercise Physiology Laboratory GEAFS - Research Group on Physiology and Epidemiology of Exercise and Physical Activity Euro American University Center, Faculty of Physical Education, Laboratory of Physical Performance and Healthy University of Brasilia, Faculty of Physical Education, Exercise Physiology Laboratory GEAFS - Research Group on Physiology and Epidemiology of Exercise and Physical Activity Goiano Federal Institute, Campus Morrinhos Euro American University Center, Faculty of Physical Education, Laboratory of Physical Performance and Healthy University of Brasilia, Faculty of Physical Education, Exercise Physiology Laboratory GEAFS - Research Group on Physiology and Epidemiology of Exercise and Physical Activity University of Brasilia, Faculty of Physical Education, Exercise Physiology Laboratory GEAFS - Research Group on Physiology and Epidemiology of Exercise and Physical Activity
Assunto:	Sistema nervoso autônomo Atletas Treinamento Exercícios físicos
Data de publicação:	30-Dez-2022
Editora:	MDPI
Referência:	MORLIN, Michelle Teles et al. High-intensity interval training combined with different types of exercises on cardiac autonomic function: an analytical cross-sectional Study in CrossFit® athletes. International Journal of Environmental Research and Public Health, v. 20, n. 1, 634, 30 dez. 2022. DOI: https://doi.org/10.3390/ijerph20010634. Disponível em: https://www.mdpi.com/1660-4601/20/1/634. Acesso em: 19 out. 2023.
Abstract:	t 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.
Unidade Acadêmica:	Faculdade de Educação Física (FEF)
Licença:	Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
DOI:	https://doi.org/10.3390/ijerph20010634
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