Acute and chronic effects of dietary nitrate supplementation on blood pressure and the physiological responses to moderate-intensity and incremental exercise

Vanhatalo, Anni, Bailey, Stephen J., Blackwell, Jamie R., DiMenna, Fred J., Pavey, Toby G., Wilkerson, Daryl P., Benjamin, Nigel, Winyard, Paul G. and Jones, Andrew M. (2010) Acute and chronic effects of dietary nitrate supplementation on blood pressure and the physiological responses to moderate-intensity and incremental exercise. American Journal of Physiology, 299 4: R1121-R1131.


Author Vanhatalo, Anni
Bailey, Stephen J.
Blackwell, Jamie R.
DiMenna, Fred J.
Pavey, Toby G.
Wilkerson, Daryl P.
Benjamin, Nigel
Winyard, Paul G.
Jones, Andrew M.
Title Acute and chronic effects of dietary nitrate supplementation on blood pressure and the physiological responses to moderate-intensity and incremental exercise
Journal name American Journal of Physiology   Check publisher's open access policy
ISSN 0363-6119
1522-1490
Publication date 2010-10
Sub-type Article (original research)
DOI 10.1152/ajpregu.00206.2010
Volume 299
Issue 4
Start page R1121
End page R1131
Total pages 11
Place of publication Bethesda, United States
Publisher American Physiological Society
Language eng
Formatted abstract Dietary nitrate (NO3) supplementation with beetroot juice (BR) over 4–6 days has been shown to reduce the O2 cost of submaximal exercise and to improve exercise tolerance. However, it is not known whether shorter (or longer) periods of supplementation have similar (or greater) effects. We therefore investigated the effects of acute and chronic NO3 supplementation on resting blood pressure (BP) and the physiological responses to moderate-intensity exercise and ramp incremental cycle exercise in eight healthy subjects. Following baseline tests, the subjects were assigned in a balanced crossover design to receive BR (0.5 l/day; 5.2 mmol of NO3/day) and placebo (PL; 0.5 l/day low-calorie juice cordial) treatments. The exercise protocol (two moderate-intensity step tests followed by a ramp test) was repeated 2.5 h following first ingestion (0.5 liter) and after 5 and 15 days of BR and PL. Plasma nitrite concentration (baseline: 454 ± 81 nM) was significantly elevated (+39% at 2.5 h postingestion; +25% at 5 days; +46% at 15 days; P < 0.05) and systolic and diastolic BP (baseline: 127 ± 6 and 72 ± 5 mmHg, respectively) were reduced by ∼4% throughout the BR supplementation period (P < 0.05). Compared with PL, the steady-state V̇o2 during moderate exercise was reduced by ∼4% after 2.5 h and remained similarly reduced after 5 and 15 days of BR (P < 0.05). The ramp test peak power and the work rate at the gas exchange threshold (baseline: 322 ± 67 W and 89 ± 15 W, respectively) were elevated after 15 days of BR (331 ± 68 W and 105 ± 28 W; P < 0.05) but not PL (323 ± 68 W and 84 ± 18 W). These results indicate that dietary NO3 supplementation acutely reduces BP and the O2 cost of submaximal exercise and that these effects are maintained for at least 15 days if supplementation is continued.
Keyword Beetroot juice
O(2) uptake
Ramp exercise
Performance
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Human Movement Studies Publications
 
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