Key result
A single session of high-intensity interval training significantly increased sympathetic modulation, indicated by a 2.3-fold increase in the 0V index from baseline (p=0.003), whereas moderate-intensity continuous training showed no significant change.
Why the study?
Although high-intensity interval training has been described as an effective alternative treatment for hypertension, its acute effects on linear and nonlinear heart rate variability measures compared with moderate-intensity continuous training remained to be evaluated.
Does one session of high-intensity interval training compared to moderate-intensity continuous training alter linear and nonlinear heart rate variability measures in hypertensive patients?
Cross-Sectional (n=11)
Open-label
Crossover randomization
Yes
Does one session of high-intensity interval training compared to moderate-intensity continuous training alter linear and nonlinear heart rate variability measures in hypertensive patients?
A single session of high-intensity interval training acutely increases sympathetic and decreases vagal modulation more than moderate-intensity continuous training in hypertensive patients, as detected by nonlinear HRV measures.
Answers are grounded in this paper and cite their sources.
Acute HIIT versus MICT effects on HRV in hypertension remain inconclusive; hypothesis-generating and requires prospective trials before any clinical consideration.
Introduction: Systemic arterial hypertension is a chronic disease worldwide. High-intensity interval training (HIIT) has been described as an effective alternative treatment. Objective: To evaluate the acute effects of one HIIT session versus one moderate-intensity continuous training (MICT) on linear and nonlinear heart rate variability (HRV) measures in hypertension patients. Methods: A preliminary cross-sectional study with 11 non-elderly (35 to 59 years) hypertensive patients using drug therapy from both sexes. They were assigned for cardiological evaluation, ergometric test, echocardiography, and cardiopulmonary exercise test. Patients performed cycling exercise in the conditions HIIT (10 bouts of 1-minute at 85% of the maximum power [Pmax] interspersed with 2 minutes at 50% of Pmax) and MICT (30 minutes at 50% of Pmax). R-R intervals (RRi) of HRV were recorded in the supine position for 10 minutes before and after the two exercise conditions. Results: HIIT and MICT presented a significant reduction (P<0.01) for the RRi between baseline (pre-session) and post-session. All other linear indices presented similar results (P>0.05) between moments. Significant differences (P<0.05) in the symbolic HRV analysis were identified only in the HIIT group for 0V, 2LV, and 2ULV indexes. 0V index increased 2.3-times from pre- to post-session while 2LV and 2ULV indexes reduced to near 50% and 35%, respectively. Conclusion: An increase in sympathetic modulation with a significant decrease in vagal modulation by nonlinear HRV measures was identified in patients with hypertension submitted to one HIIT session.
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Mesquita et al. (2021) conducted a cross-sectional in Systemic arterial hypertension (n=11). High-intensity interval training (HIIT) vs. Moderate-intensity continuous training (MICT) was evaluated on 0V index (marker of sympathetic modulation in nonlinear HRV analysis) (p=0.003). A single session of high-intensity interval training significantly increased sympathetic modulation, indicated by a 2.3-fold increase in the 0V index from baseline (p=0.003), whereas moderate-intensity continuous training showed no significant change.
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