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The Effects of Acute and Chronic Beetroot Juice Supplementation on Exercise Economy and Time Trial Performance in Recreationally Active Females

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Title: The Effects of Acute and Chronic Beetroot Juice Supplementation on Exercise Economy and Time Trial Performance in Recreationally Active Females
Author: Wickham, Kate
Department: Department of Human Health and Nutritional Sciences
Program: Human Health and Nutritional Sciences
Advisor: Spriet, Lawrence
Abstract: Beetroot juice (BRJ) is a supplement that reduces the oxygen cost of submaximal exercise and improves performance in recreationally active males, both acutely and chronically. However, evidence supporting the effects of BRJ in females is lacking. This thesis examined the effects of acute and chronic BRJ supplementation in 12 recreationally active females (VO2peak: 40.6 ± 1.2 mL O2/kg/min). Using a randomized, double-blind, placebo-controlled, crossover design, subjects supplemented with 280 mL BRJ or a nitrate-free placebo for 8 days separated by a 9 ± 1 days washout period. On days 1 (acute) and 8 (chronic), subjects completed a submaximal cycling protocol and a 4 kJ/kg time trial. Acute and chronic BRJ supplementation had no effect on VO2 at 50 or 70% VO2peak, despite large increases in plasma nitrate and nitrite. Additionally, there was no difference in time trial completion. To conclude, recreationally active females may not benefit from acute or chronic BRJ supplementation.
URI: http://hdl.handle.net/10214/14059
Date: 2018-07


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