title: Effect of Moderate- Versus High-Intensity Interval Exercise Training on Heart Rate Variability Parameters in Inactive Latin-American Adults: A Randomized Clinical Trial.
abstract: Ramírez-Vélez, R, Tordecilla-Sanders, A, Téllez-T, LA, Camelo-Prieto, D, Hernández-Quiñonez, PA, Correa-Bautista, JE, Garcia-Hermoso, A, Ramírez-Campillo, R, and Izquierdo, M. Effect of moderate- versus high-intensity interval exercise training on heart rate variability parameters in inactive Latin-American adults: a randomized clinical trial. J Strength Cond Res 34(12): 3403-3415, 2020-We investigated the effect of moderate versus high-intensity interval exercise training on the heart rate variability (HRV) indices in physically inactive adults. Twenty inactive adults were randomly allocated to receive either moderate-intensity training (MCT group) or high-intensity interval training (HIT group). The MCT group performed aerobic training at an intensity of 55-75%, which consisted of walking on a treadmill at 60-80% of the maximum heart rate (HRmax) until the expenditure of 300 kcal. The HIT group ran on a treadmill for 4 minutes at 85-95% peak HRmax and had a recovery of 4 minutes at 65% peak HRmax until the expenditure of 300 kcal. Supine resting HRV indices (time domain: SDNN = SD of normal-to-normal intervals; rMSSD = root mean square successive difference of R-R intervals and frequency domain: HFLn = high-frequency spectral power; LF = low-frequency spectral power and HF/LF ratio) were measured at baseline and 12 weeks thereafter. The SDNN changes were 3.4 (8.9) milliseconds in the MCT group and 29.1 (7.6) milliseconds in the HIT group {difference between groups 32.6 (95% confidence interval, 24.9 to 40.4 [p = 0.01])}. The LF/HFLn ratio changes were 0.19 (0.03) milliseconds in the MCT group and 0.13 (0.01) milliseconds in the HIT group (p between groups = 0.016). No significant group differences were observed for the rMSSD, HF, and LF parameters. In inactive adults, this study showed that a 12-week HIT training program could increase short-term HRV, mostly in vagally mediated indices such as SDNN and HF/LFLn ratio power. Trial registration. ClinicalTrials.gov NCT02738385 https://clinicaltrials.gov/ct2/show/NCT01796275, registered on March 23, 2016.
authors.affiliation: Center of Studies in Physical Activity Measurements, School of Medicine and Health Sciences, University of Rosario, Bogotá, District Capital, Colombia.
authors.forename: Robinson
authors.initials: R
authors.lastname: Ramírez-Vélez
authors.affiliation: Center of Studies in Physical Activity Measurements, School of Medicine and Health Sciences, University of Rosario, Bogotá, District Capital, Colombia.
authors.forename: Alejandra
authors.initials: A
authors.lastname: Tordecilla-Sanders
authors.affiliation: GICAEDS Group, Faculty of Physical Culture, Sport and Recreation, Saint Thomas University, Bogotá, District Capital, Colombia.
authors.forename: Luis A
authors.initials: LA
authors.lastname: Téllez-T
authors.affiliation: GICAEDS Group, Faculty of Physical Culture, Sport and Recreation, Saint Thomas University, Bogotá, District Capital, Colombia.
authors.forename: Diana
authors.initials: D
authors.lastname: Camelo-Prieto
authors.affiliation: Center of Studies in Physical Activity Measurements, School of Medicine and Health Sciences, University of Rosario, Bogotá, District Capital, Colombia.
authors.forename: Paula A
authors.initials: PA
authors.lastname: Hernández-Quiñonez
authors.affiliation: Center of Studies in Physical Activity Measurements, School of Medicine and Health Sciences, University of Rosario, Bogotá, District Capital, Colombia.
authors.forename: Jorge E
authors.initials: JE
authors.lastname: Correa-Bautista
authors.affiliation: School of Physical Activity, Sport and Health Sciences, University of Santiago, Chile, USACH, Santiago, Chile.
authors.forename: Antonio
authors.initials: A
authors.lastname: Garcia-Hermoso
authors.affiliation: Department of Physical Activity Sciences, University of Los Lagos, Osorno, Chile; and.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Ramírez-Campillo
authors.affiliation: Department of Health Sciences, Public University of Navarra, Center for Biomedical Research in Network (CIBER) of Fragility and Healthy Aging (CB16/10/00315), Pamplona, Navarre, Spain.
authors.forename: Mikel
authors.initials: M
authors.lastname: Izquierdo
mesh_terms: D000293:Adolescent; D000328:Adult; D003105:Colombia; D004311:Double-Blind Method; D015444:Exercise / Q000502:physiology; D005080:Exercise Test; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D000072696:High-Intensity Interval Training / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D057185:Sedentary Behavior / Q000208:ethnology*; D014481:United States; D055815:Young Adult