Influence of dietary nitrate supplementation on physiological and cognitive responses to incremental cycle exercise.
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| Abstract |
Dietary inorganic nitrate supplementation causes physiological effects which may enhance exercise tolerance. However it is not known whether nitrate might alter cognitive function during exercise. In a double-blind, cross-over study, sixteen subjects ingested either nitrate-rich beetroot juice or a placebo and completed a continuous cycle exercise test involving 20min stages at 50% and 70% V˙O2peak and a final stage at 90% V˙O2peak until volitional exhaustion. Cognitive tasks were completed before, during and after exercise. In the dietary nitrate condition: plasma [nitrite] increased (p<0.01), systolic blood pressure decreased (p<0.05) and there was a trend for a reduced oxygen uptake at 50% V˙O2peak. Tissue oxygenation improved across exercise intensities and exercise tolerance was greater at 90% V˙O2peak (p<0.05). Rating of perceived exertion, energy levels and cognitive performance were similar between conditions with mental fatigue being evident from 70% V˙O2peak onwards (p<0.05). Dietary nitrate supplementation enhanced short-term endurance exercise performance with concomitant mental fatigue but did not improve cognitive performance post-fatigue.
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| Authors | Kevin G Thompson, Louise Turner, Jonathon Prichard, Fiona Dodd, David O Kennedy, Crystal Haskell, James R Blackwell, Andrew M Jones |
| Journal | Respiratory physiology & neurobiology (Respir Physiol Neurobiol) Vol. 193 Pg. 11-20 (Mar 01 2014) ISSN: 1878-1519 [Electronic] Netherlands |
| PMID | 24389270 (Publication Type: Journal Article) |
| Copyright | Copyright © 2014 Elsevier B.V. All rights reserved. |
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