Key result
A single dose of beetroot juice did not change post-exercise blood pressure responses compared to placebo in hypertensive postmenopausal women, despite increasing salivary nitrite (p<0.001).
Why the study?
It was unknown whether acute intake of beetroot juice potentiates post-exercise hypotension in hypertensive postmenopausal women.
Does acute beetroot juice intake potentiate post-exercise hypotension in hypertensive postmenopausal women?
RCT (n=13)
Does acute beetroot juice intake potentiate post-exercise hypotension in hypertensive postmenopausal women?
Acute beetroot juice intake does not potentiate post-exercise hypotension in hypertensive postmenopausal women despite increasing salivary nitrite levels.
Acute beetroot juice does not enhance PEH in hypertensive postmenopausal women; challenges nitrate supplementation for potentiating this response.
Objective: To verify if acute intake of beetroot juice potentiates post-exercise hypotension (PEH) in hypertensive postmenopausal women. Methods: Thirteen hypertensive postmenopausal women (58.1 ± 4.62 years and 27.4 ± 4.25 kg/m²) were recruited to participate in three experimental sessions, taking three different beverages: Beetroot juice (BJ), placebo nitrate-depleted BJ (PLA), and orange flavored non-caloric drink (OFD). The participants performed moderate aerobic exercise training on a treadmill, at 65–70% of heart rate reserve (HRR), for 40 min. After an overnight fast, the protocol started at 07h when the first resting blood pressure (BP) was measured. The beverage was ingested at 07h30 and BP was monitored until the exercise training started, at 09h30. After the end of the exercise session, BP was measured every 15 min over a 90-min period. Saliva samples were collected at rest, immediately before and after exercise, and 90 min after exercise for nitrite (NO2−) analysis. Results: There was an increase in salivary NO2− with BJ intake when compared to OFD and PLA. A slight increase in salivary NO2− was observed with PLA when compared to OFD (p < 0.05), however, PLA resulted in lower salivary NO2− when compared to BJ (p < 0.001). There were no changes in salivary NO2− with the OFD. Systolic and diastolic BP decreased (p < 0.001) on all post exercise time points after all interventions, with no difference between the three beverages. Conclusion: Acute BJ intake does not change PEH responses in hypertensive postmenopausal women, even though there is an increase in salivary NO2−.
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Amaral et al. (2019) conducted an RCT in Hypertension in postmenopausal women (n=13). Beetroot juice vs. Placebo nitrate-depleted beetroot juice and orange flavored non-caloric drink was evaluated on Post-exercise blood pressure (systolic and diastolic). A single dose of beetroot juice did not change post-exercise blood pressure responses compared to placebo in hypertensive postmenopausal women, despite increasing salivary nitrite (p<0.001).
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