Journal article
Effects of acute dietary nitrate supplementation on aortic blood pressure and aortic augmentation index in young and older adults
Nitric oxide, Vol.59, pp.21-27
09/30/2016
DOI: 10.1016/j.niox.2016.06.007
PMID: 27373229
Abstract
Aging is associated with elevated blood pressure (peripheral and aortic; BP) and aortic augmentation index (AIx) which may contribute to aortic BP. Although inorganic nitrate consumption reduces peripheral BP in both young and older adults, the effects of nitrate consumption on aortic BP and wave reflection in young and older adults is unknown. Therefore, we sought to characterize the effects of nitrate consumption on aortic BP and AIx in young and older adults.
Noninvasive aortic pressure waveforms were synthesized from high-fidelity radial pressure waveforms via applanation tonometry before and following (60, 90, 120, 150, and 180 min) consumption of a nitrate-rich beetroot juice in 26 healthy adults (young: 25 ± 4 years, n = 14; older: 64 ± 5 years, n = 12). Aortic BP and indices of aortic wave reflection (AIx and AIx normalized for heart rate; AIx@75bpm) were calculated from the generated aortic pressure waveform.
Nitrate consumption increased plasma nitrite in both groups 60–180 min following beetroot consumption (P < 0.001). Nitrate consumption reduced peripheral and aortic BP in both young and older adults (P < 0.05), with the change being similar between age groups. Conversely, indices of aortic wave reflection were reduced only in young adults following nitrate consumption (range of change from baseline over time: AIx@75bpm, −4.3 to −8.8%, P < 0.05), whereas aortic AIx remained unchanged in the older adults.
Taken together, our results suggest that acute dietary nitrate supplementation reduces peripheral and aortic BP similarly in young and older adults despite differential effects on aortic AIx between age groups.
•Dietary nitrate reduces aortic blood pressure similarly in young and older adults.•Aortic augmentation index is reduced with dietary nitrate in young adults only.•The greatest reduction in aortic augmentation index paralleled peak plasma [NO2−].
Details
- Title: Subtitle
- Effects of acute dietary nitrate supplementation on aortic blood pressure and aortic augmentation index in young and older adults
- Creators
- William E Hughes - Department of Physical Therapy and Rehabilitation Science, Carver College of Medicine, University of Iowa, Iowa City, IA, USAKenichi Ueda - Department of Anesthesia, University of Iowa Hospital and Clinics, University of Iowa, Iowa City, IA, USADavid P Treichler - Department of Physical Therapy and Rehabilitation Science, Carver College of Medicine, University of Iowa, Iowa City, IA, USADarren P Casey - Department of Physical Therapy and Rehabilitation Science, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Nitric oxide, Vol.59, pp.21-27
- Publisher
- Elsevier Inc
- DOI
- 10.1016/j.niox.2016.06.007
- PMID
- 27373229
- ISSN
- 1089-8603
- eISSN
- 1089-8611
- Grant note
- name: Research Endowment Grant; DOI: 10.13039/100008749, name: American College of Sports Medicine Foundation
- Language
- English
- Date published
- 09/30/2016
- Academic Unit
- Anesthesia; Physical Therapy and Rehabilitation Science; Fraternal Order of Eagles Diabetes Research Center
- Record Identifier
- 9984047655802771
Metrics
13 Record Views