Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine ( 2019 ) 18 , 118 - 127

Research article
Effect of Acute Dietary Nitrate Supplementation on the Post-Exercise Ambulatory Blood Pressure in Obese Males: A Randomized, Controlled, Crossover Trial
Ágnes D. de Lima Bezerra1, Eduardo C. Costa2,3, Daniela A. Pacheco1, Daniel C. Souza2, Luiz F. Farias-Junior3, Raphael M. Ritti-Dia4, Gisele B. Grigolo5, Paulo I. H. de Bittencourt Júnior5, Mauricio Krause5, Ana P. T. Fayh1,2, 
Author Information
1 Graduate Program in Nutrition, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, Brazil
2 Graduate Program in Physical Education, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, Brazil
3 Graduate Program in Health Sciences, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, Brazil
4 Graduate Program in Rehabilitation Sciences, Nove de Julho University, São Paulo SP, Brazil
5 Laboratory of Inflammation, Metabolism and Exercise Research (LAPIMEX) and Laboratory of Cellular Physiology, Department of Physiology, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul, Porto Alegre, Brazil

Ana P. T. Fayh
✉ Department of Nutrition, Health Sciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
Email: apfayh@yahoo.com.br
Publish Date
Received: 08-10-2018
Accepted: 12-12-2018
Published (online): 11-02-2019
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ABSTRACT

This study aimed to verify the effect of beetroot juice on post-exercise ambulatory blood pressure (BP) in obese individuals. Fourteen non-hypertensive obese males were randomly assigned to three experimental sessions: 1) Beetroot juice with exercise (BJE, 200ml with ≈ 800mg nitrate and 40 minutes of moderate-intensity aerobic exercise at an intensity of 50% of the heart rate reserve), 2) fruit soda with exercise (FSE, 200ml of a low-nitrate drink and the same exercise session) and 3) control (CON, 200ml of water, an insignificant nitrate drink without exercise). The concentration of total nitrites and nitrates in plasma (NOx) after the drinks and the 24-hour ambulatory BP were evaluated. A two-way (condition vs. time) ANOVA for repeated measures, with a Bonferroni post hoc was used to analyze variables. The plasma NOx concentration increased significantly after ingestion of beetroot juice (from 9.9 ± 8.4 μM to 47.0 ± 16.9 μM, p < 0.001) and remained elevated until 1 hour post-intervention (54.7 ± 10.1 μM, p < 0.001), while it did not change in FSE and CON groups. The BJE session decreased ambulatory systolic BP in 5.3 mmHg (IC95%, -10.1 to -0.6, p = 0.025) in the period of 1-6 h after the BJE session compared to the CON session and reduction of 3.8 mmHg (IC95%, -7.5 to -0.007, p = 0.05) compared to the FSE session. No significant changes were observed for ambulatory diastolic BP (p > 0.05). BJE enhanced the reduction of systolic ambulatory BP up to 6 hours following a moderate-intensity aerobic exercise in obese individuals with an elevated cardiovascular risk profile.

Key words: Aerobic exercise, nitric oxide, post-exercise hypotension, obesity, cardiovascular disease


           Key Points
  • Inorganic nitrate may have important therapeutic applications to decrease the blood pressure response to exercise when individuals have cardiovascular risk.
  • Beetroot may be a co-adjuvant to increase post-exercise blood pressure response.
  • Supplementation of beetroot juice significantly increased the plasma NOx concentration.
 
 
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