Cardiovascular Diseases Clinical Trial
Official title:
Nitrate-rich Beet Juice Intake and Aerobic Exercise on Cardiovascular Health of Postmenopausal Women With Arterial Hypertension
In the context of physical exercise, there is no evidence of the acute and continued use of beetroot juice with a previously recommended dose of nitrate (NO3) (>300mg) on the cardiovascular performance of hypertensive and postmenopausal women. We will investigate the effects of beetroot juice rich in NO3 acutely (first day: 140mL/800mg) and during a week with daily doses (second to the seventh day: 70mL/400mg) on blood pressure, heart rate (HR), cardiac autonomic control, EF, inflammatory, hormonal, and stress biomarkers oxidative stress and enzymes involved in nitric oxide synthesis and mitochondrial regulation, under resting conditions, as well as mediated by submaximal aerobic exercise sessions. Through a randomized, crossover, triple-blind, placebo-controlled clinical trial, 20 physically inactive hypertensive women will undergo an acute and 7-day trial, each with two intervention protocols: 1) placebo and 2) beetroot; in which will ingest beet juice with or without NO3 in its composition with a 7-day washout interval. On collection days, exercise will be performed on a treadmill for 40 minutes at a speed corresponding to 65-70% of VO2peak. The collection of variables (cardiovascular, autonomic, and blood samples for molecular analyses) of the study will take place at rest (120 minutes after ingestion of the intervention), during exercise (40 minutes), and in the effort recovery stage (during 65 minutes) based on previously validated protocols. The collections were arranged so that the measurement of one variable does not interfere with the other and that they have adequate intervals between them.
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