1. EFFECT OF MODERATE- VERSUS HIGH-INTENSITY INTERVAL EXERCISE TRAINING ON HEART RATE VARIABILITY PARAMETERS IN INACTIVE LATINAMERICAN ADULTS: A RANDOMIZED CLINICAL TRIAL.
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RAMíREZ-VéLEZ, ROBINSON, TORDECILLA-SANDERS, ALEJANDRA, TéLLEZ-T, LUIS A., CAMELO-PRIETO, DIANA, HERNáNDEZ-QUIñONEZ, PAULA A., CORREA-BAUTISTA, JORGE E., GARCIA-HERMOSO, ANTONIO, RAMíREZ-CAMPILLO, RODRIGO, and IZQUIERDO, MIKEL
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AEROBIC exercises , *CONFIDENCE intervals , *ENERGY metabolism , *EXERCISE physiology , *HEART beat , *HISPANIC Americans , *STATISTICAL sampling , *RANDOMIZED controlled trials , *EXERCISE intensity , *SEDENTARY lifestyles , *DESCRIPTIVE statistics , *HIGH-intensity interval training - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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