The Effect of Acute Beetroot Juice Supplementation on Blood Pressure During High Intensity Interval Exercise

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Author
Wort, Georgina
Date
2015Type
Thesis
Publisher
Cardiff Metropolitan University
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Introduction: Hypertension is a major cardiovascular disease (CVD) risk factor. Low
aerobic fitness is a contributing factor to the prevalence of hypertension. Previous
research has shown that high intensity interval exercise (HIE) training causes more rapid
and greater physiological adaptations compared to traditional aerobic training, therefore
this would be the best protocol for the prevention and treatment of hypertension and CVD.
Individuals’ blood pressure (BP) responses to exercise have been shown to provide
predictive information for multiple heath risks. Beetroot juice has been found to reduce
resting BP; however, the effects on BP responses to exercise are unknown. This study
examined the BP responses during a HIE protocol. Methods: Ten normotensive
participants were recruited (20 ± 1yr, 81.1 ± 11.4kg, 175 ± 8cm). On two separate
occasions participants came into the laboratory and BP was measured at rest for 30
minutes, 2.5 hours following either beetroot juice or blackcurrant cordial ingestion. Then a
exercise HIE protocol involving 10x60 seconds at 50% PPO and 10x60 seconds at 90%
PPO was performed, HR and BP were measured throughout. Results: Trends were seen
in reduced SBP at rest and reduced DBP and MAP responses throughout exercise when
comparing beetroot juice supplementation to the blackcurrant placebo, however no
significant differences were found (P> 0.05). Conclusions: Although findings showed no
significant differences, the trends in reductions in SBP at rest and DBP response during
exercise may possess clinical significance for both normotensive and hypertensive, active
and inactive individual.
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