Exponential model for analysis of heart rate responses and autonomic cardiac modulation during different intensities of physical exercise.

Autor:	Silva LRB; Department of Physical Education, Faculty Araguaia, Goiânia, Goiás, Brazil.; Faculty of Physical Education and Dance, Federal University of Goiás, Goiânia, Brazil.; School of Medicine, Federal University of Goiás, Goiânia, Brazil., Gentil PRV; Faculty of Physical Education and Dance, Federal University of Goiás, Goiânia, Brazil.; School of Medicine, Federal University of Goiás, Goiânia, Brazil., Beltrame T; Institute of Computing, University of Campinas, Campinas, Sao Paulo, Brazil.; Department of Physiotherapy, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil.; Department of Physiotherapy, Universidade Ibirapuera, Sao Paulo, Sao Paulo, Brazil., Basso Filho MA; Department of Physiotherapy, School of Social Sciences and Health, Pontifical Catholic University of Goiás, Goiânia, Brazil., Alves FM; Faculty of Physical Education and Dance, Federal University of Goiás, Goiânia, Brazil., Silva MS; Faculty of Physical Education and Dance, Federal University of Goiás, Goiânia, Brazil.; School of Medicine, Federal University of Goiás, Goiânia, Brazil., Pedrino GR; Center for Neuroscience and Cardiovascular Research, Institute of Biological Sciences, Federal University of Goiás, Goiânia, Brazil., Ramirez-Campillo R; Laboratory of Human Performance, Research Nucleus in Health, Physical Activity and Sport, GIAP in Quality of Life and Human Well-Being, Department of Physical Activity Science, Universidad de Los Lagos, Osorno, Chile., Coswig V; College of Physical Education, Federal University of Pará, Castanhal, Brazil., Rebelo ACS; School of Medicine, Federal University of Goiás, Goiânia, Brazil.; Department of Morphology, Biological Sciences Institute, Federal University of Goiás, Goiânia, Brazil.
Jazyk:	angličtina
Zdroj:	Royal Society open science [R Soc Open Sci] 2019 Oct 16; Vol. 6 (10), pp. 190639. Date of Electronic Publication: 2019 Oct 16 (Print Publication: 2019).
DOI:	10.1098/rsos.190639
Abstrakt:	The aim of this study was to compare the heart rate (HR) dynamics and variability before and after high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT) protocols with workloads based on treadmill workload at which maximal oxygen uptake was achieved ( WL V ˙ O 2 max ) . Ten participants performed cardiopulmonary exercise testing (CPET) to obtain oxygen uptake ( WL V ˙ O 2 max ) . All training protocols were performed on a treadmill, with 0% grade, and had similar total distance. The MICT was composed by 21 min at 70% of WL V ˙ O 2 max . The first HIIT protocol (HIIT-30 : 30) was composed by 29 repetitions of 30 s at 100% of s V ˙ O 2 max and the second HIIT protocol (HIIT-4 : 3) was composed by three repetitions of 4 min at 90% of WL V ˙ O 2 max . Before, during and after each training protocol, HR dynamics and variability (HRV) were analysed by standard kinetics and linear (time and frequency domains). The repeated measures analysis of variance indicated that the HR dynamics, which characterizes the speed of HR during the rest to exercise transition, was statistically ( p < 0.05) slower during MICT in comparison to both HIIT protocols. The HRV analysis, which characterizes the cardiac autonomic modulation during the exercise recovery, was statistically higher in HIIT-4 : 3 in comparison to MICT and HIIT-30 : 30 protocols ( p < 0.005 and p = 0.012, respectively), suggesting that the HIIT-4 : 3 induced higher sympathetic and lower parasympathetic modulation during exercise in comparison to the other training protocols. In conclusion, HIIT-4 : 3 demonstrated post-exercise sympathetic hyperactivity and a higher HRpeak, while the HIIT-30 : 30 and MICT resulted in better HRV and HR in the exercise-recovery transition. The cardiac autonomic balance increased in HIIT-30 : 30 while HIIT-4 : 3 induced sympathetic hyperactivity and cardiac overload. Competing Interests: We declare that there is no conflict of interest. (© 2019 The Authors.)
Databáze:	MEDLINE
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