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标题：Beetroot juice intake with different amounts of nitrate does not change aerobic exercise-mediated responses in heart rate variability in hypertensive postmenopausal women: A randomized, crossover and double-blind study
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作者：Victor Hugo V. Carrijo ; Ana Luiza Amaral ; Igor M. Mariano 等
期刊名称：Journal of Exercise Science and Fitness
印刷版ISSN：1728-869X
出版年度：2021
卷号：19
期号：2
页码：104-110
DOI：10.1016/j.jesf.2020.12.001
出版社：Elsevier
摘要：Objectives To compare the acute effects of a single dose of beetroot juice (BJ) with different concentrations of nitrate (NO 3 − ) on heart rate variability (HRV) in postmenopausal hypertensive women. Methods Thirteen hypertensive postmenopausal women (58.1 ± 4.6 years of age and 27 ± 4 kg/m 2 of BMI) completed the protocol that consisted of three visits with different beverage intakes in a randomized and crossover design. The three beverages were BJ with a high content of nitrate (high-NO 3 - ), BJ with a low content of nitrate (low-NO 3 - ), and an orange flavored non-caloric drink (OFD). Heart rate (HR) were evaluated during 20 min after sitting rest at 7:20 a.m. (baseline), after they drank one of the drinks, and remained at sitting rest for 120 min and then performed 40 min of aerobic exercise at 65–70% of the HR reserve on a treadmill. HR was recorded for 90 min after exercise for time, frequency, and non-linear domains of HRV index analysis. Results Two-way ANOVA showed that there were no interaction effects (time∗sessions) in any of the HRV indexes after exercise in all three sessions. HRV indexes increased after exercise ( p = <0.05) similarly in all three sessions when compared with the baseline time point. Conclusion Therefore, a single dose of BJ, independent of NO 3 − content, does not change aerobic exercise-mediated responses in HRV indexes in hypertensive postmenopausal women.
关键词：Inorganic nitrate ; Exercise ; Hypertension ; Menopause ; Autonomic nervous system