5Objectives: Dietary nitrate can improve repeated high-intensity and supramaximal exercise 6 performance, although the effect on adaptations to training has received limited attention. The 7 purpose of this study was to investigate the effects of dietary nitrate on the response to 3-weeks 8 of sprint interval training (SIT). Design: Randomized control trial. Methods: Twenty-seven 9 untrained males (Age: 28 ± 7 y, V̇O 2Max : 42 ± 7 ml·kg -1 ·min -1 ) completed an incremental 10 exercise test at the beginning and end of the study. Participants were matched for V̇O 2Max and 11 randomly assigned to a control group (CON; n=8), SIT + placebo group (PLA; n=10), or SIT consumption (V̇O 2 ) data were filtered and smoothed data were analyzed to determine V̇O 2max .
69A plateau in V̇O 2 (determined by a rise in V̇O 2 of <50% of the expected increase for the given 70 WR) was used to confirm achievement of V̇O 2max . Based on these criteria, valid determinations 71 of V̇O 2max were obtained from all participants at each time point. The coefficient of variation 72 for our lab utilizing this protocol and method of assessment is 1.9%. VT was determined by 73 the 'V-slope' method as the break point in the association between carbon dioxide 74 production and V̇O 2 14 .