Influence of dietary nitrate supplementation on physiological and cognitive responses to incremental cycle exercise

Thompson, Kevin, Turner, Louise, Prichard, Jonathan, Dodd, Fiona, Kennedy, David, Haskell, Crystal, Blackwell, James and Jones, Andrew (2014) Influence of dietary nitrate supplementation on physiological and cognitive responses to incremental cycle exercise. Respiratory Physiology & Neurobiology, 193. pp. 11-20. ISSN 15699048

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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 20 min 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.

Item Type:	Article
Additional Information:	Crystal Haskell now known as Crystal Haskell-Ramsay.
Uncontrolled Keywords:	Dietary nitrate, exercise tolerance, cognitive function
Subjects:	C600 Sports Science
Department:	Faculties > Health and Life Sciences > Psychology Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User:	Ellen Cole
Date Deposited:	13 Feb 2014 17:06
Last Modified:	12 Oct 2019 16:26
URI:	http://nrl.northumbria.ac.uk/id/eprint/15403

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