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

THOMPSON, K.G, TURNER, Louise, PRITCHARD, J, DODD, F, KENNEDY, D.O, HASKELL, C, BLACKWELL, J.R and JONES, A.M (2014). The influence of dietary nitrate supplementation on physiological and cognitive responses to incremental cycle exercise. Respiratory Physiology and Neurobiology, 193, 11-20.

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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Link to published version:: 10.1016/j.resp.2013.12.015

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.

Item Type: Article
Research Institute, Centre or Group: Centre for Sport and Exercise Science
Identification Number: 10.1016/j.resp.2013.12.015
Depositing User: Alison Gratton
Date Deposited: 13 Aug 2015 10:54
Last Modified: 13 Aug 2015 10:54
URI: http://shura.shu.ac.uk/id/eprint/10765

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