title: High-Intensity Intermittent Exercise and Autonomic Modulation: Effects of Different Volume Sessions.
abstract: The aim of this study was to compare heart rate variability (HRV) recovery after 2 sessions of high-intensity intermittent exercise at different volumes (1.25 km [HIIE1.25] and 2.5 km [HIIE2.5]). 13 participants determined their maximal aerobic speed (MAS) and completed 2 HIIE (1:1 at 100% MAS) trials. The heart rate was recorded before and after each session. HRV indicators were calculated according to time (RMSSD and SDNN) and frequency (LF, HF and LF/HF ratio) domains. SDNN and RMSSD presented effect of test (F=20.97; p<0.01 and F=21.00; p<0.01, respectively) and moment (F=6.76; p<0.01 and F=12.30; p<0.01, respectively), without interaction. Even though we did not find an interaction effect for any HRV variables, the HIIE2.5presented a delay of only 5 min in HRV recovery, when compared to HIIE1.25. However, the effects of the test (SDNN, RMSSD, LF-log, and HF-log) indicate higher autonomic stress during the entire recovery period. These findings may indicate that exercise volume interferes with HRV recovery. If so, physically active subjects may choose a lower volume exercise (i. e., HIIE1.25) in order to promote similar physical fitness adaptations with lower loading on autonomic modulation.
authors.affiliation: Physiotherapy, Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Presidente Prudente, Brazil.
authors.forename: Carlos Iván Mesa
authors.initials: CIM
authors.lastname: Castrillón
authors.affiliation: Physiotherapy, Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Presidente Prudente, Brazil.
authors.forename: Rodolfo Augusto Travagin
authors.initials: RAT
authors.lastname: Miranda
authors.affiliation: Exercise and Immunometabolism Research Group, Department of Physical Education, Universidade Estadual Paulista (UNESP) - Presidente Prudente, São Paulo, Brazil.
authors.forename: Carolina
authors.initials: C
authors.lastname: Cabral-Santos
authors.affiliation: Physiotherapy, Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Presidente Prudente, Brazil.
authors.forename: Lais Manata
authors.initials: LM
authors.lastname: Vanzella
authors.affiliation: Faculty of Physical Education, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.
authors.forename: Bruno
authors.initials: B
authors.lastname: Rodrigues
authors.affiliation: Physiotherapy, Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Presidente Prudente, Brazil.
authors.forename: Luiz Carlos Marques
authors.initials: LCM
authors.lastname: Vanderlei
authors.affiliation: Exercise and Immunometabolism Research Group, Department of Physical Education, Universidade Estadual Paulista (UNESP) - Presidente Prudente, São Paulo, Brazil.
authors.forename: Fábio Santos
authors.initials: FS
authors.lastname: Lira
authors.affiliation: Universidade Federal de Pernambuco, Physical Education Department, Recife, Brazil.
authors.forename: Eduardo Zapaterra
authors.initials: EZ
authors.lastname: Campos
mesh_terms: D000222:Adaptation, Physiological; D000293:Adolescent; D000328:Adult; D001341:Autonomic Nervous System / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D000072696:High-Intensity Interval Training; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D055815:Young Adult