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No effect of acute and 6-day nitrate supplementation on VO2 and time-trial performance in highly trained cyclists
Nyakayiru, Jean Jonvik, Kristin L. Pinckaers, Philippe J.M. Senden, Joan M. Van Loon, Luc Verdijk, Lex B.
Nyakayiru, Jean
Jonvik, Kristin L.
Pinckaers, Philippe J.M.
Senden, Joan M.
Van Loon, Luc
Verdijk, Lex B.
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Author
Nyakayiru, Jean
Jonvik, Kristin L.
Pinckaers, Philippe J.M.
Senden, Joan M.
Van Loon, Luc
Verdijk, Lex B.
Jonvik, Kristin L.
Pinckaers, Philippe J.M.
Senden, Joan M.
Van Loon, Luc
Verdijk, Lex B.
Abstract
While the majority of studies reporting ergogenic effects of dietary nitrate have used a multiday supplemen-tation protocol, some studies suggest that a single dose of dietary nitrate before exercise can also improve subsequent performance. We aimed to compare the impact of acute and 6-day sodium nitrate supplementation on oxygen uptake (V˙ O2) and time-trial performance in trained cyclists. Using a randomized, double-blind, cross-over design, 17 male cyclists (25 ± 4 y, V˙ O2peak 65 ± 4 ml·kg-1·min-1, Wmax 411 ± 35 W) were subjected to 3 different trials; 5 days placebo and 1 day sodium nitrate supplementation (1-DAY); 6 days sodium nitrate supplementation (6-DAY); 6 days placebo supplementation (PLA). Nitrate was administered as 1097 mg sodium nitrate providing 800 mg (~12.9 mmol) nitrate per day. Three hours after ingestion of the last supplemental bolus, indirect calorimetry was performed while subjects performed 30 min of exercise at 45% Wmax and 30 min at 65% Wmax on a cycle ergometer, followed by a 10 km time-trial. Immediately before exercise, plasma [nitrate] and [nitrite] increased to a similar extent during the 6-DAY and 1-DAY trial, but not with PLA (plasma nitrite: 501 ± 205, 553 ± 278, and 239 ± 74 nM, respectively; p < .001). No differences were observed between interventions in V˙ O2 during submaximal exercise, or in time to complete the time-trial (6-DAY: 1004 ± 61, 1-DAY: 1022 ± 72, PLA: 1017 ± 71 s; p = .28). We conclude that both acute and 6-days of sodium nitrate supplementation do not alter V˙ O2 during submaximal exercise or improve time-trial performance in highly trained cyclists, despite increasing plasma [nitrate] and [nitrite].
Keywords
Nitrite, ergogenic aid, sodium nitrate
Date
2017
Type
Journal article
Journal
International Journal of Sport Nutrition and Exercise Metabolism
Book
Volume
27
Issue
1
Page Range
11-17
Article Number
ACU Department
Centre for Exercise and Nutrition
Faculty of Health Sciences
Faculty of Health Sciences
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