期刊
RESPIRATORY PHYSIOLOGY & NEUROBIOLOGY
卷 193, 期 -, 页码 11-20出版社
ELSEVIER
DOI: 10.1016/j.resp.2013.12.015
关键词
Dietary nitrate; Exercise tolerance; Cognitive function
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)over dotO(2peak) and a final stage at 90% (V)over dotO(2peak) 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)over dotO(2peak). Tissue oxygenation improved across exercise intensities and exercise tolerance was greater at 90% (V)over dotO(2peak) (p < 0.05). Rating of perceived exertion, energy levels and cognitive performance were similar between conditions with mental fatigue being evident from 70% (V)over dotO(2peak) 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. (C) 2014 Elsevier B.V. All rights reserved.
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