The effects of dietary nitrate supplementation on the adaptations to sprint interval training in previously untrained males

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• 作者：David J. Muggeridge^a ; Nicholas Sculthorpe^a ; Philip E. James^b ; Chris Easton^a ; ^{chris.easton@uws.ac.uk}
• 关键词：Nitric oxide ; Nitrite ; Exercise ; V&sdot ; O2Max
• 刊名：Journal of Science and Medicine in Sport
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：20
• 期：1
• 页码：92-97
• 全文大小：763 K
• 卷排序：20

文摘

Dietary nitrate can improve repeated high-intensity and supramaximal exercise performance, although the effect on adaptations to training has received limited attention. The purpose of this study was to investigate the effects of dietary nitrate on the response to 3-weeks of sprint interval training (SIT).DesignRandomized control trial.MethodsTwenty-seven untrained males (Age: 28 ± 7 y, V⋅O2Max: 42 ± 7 ml kg−1 min–1) completed an incremental exercise test at the beginning and end of the study. Participants were matched for V⋅O2Max and randomly assigned to a control group (CON; n = 8), SIT + placebo group (PLA; n = 10), or SIT + nitrate group (NIT; n = 9). The SIT comprised 4–6 repeated 15 s all out sprints on a cycle ergometer, interspersed with 4 min active recovery, 3-times per week. Approximately 2.5 h prior to exercise, participants consumed gels containing ∼0.1 mmol (PLA) or ∼8 mmol nitrate (NIT).ResultsFollowing SIT, V⋅O2Max (PLA: 5%, p = 0.057, d = 0.34; NIT: 6.3%, p = 0.041, d = 0.34) and ventilatory threshold (VT) increased to a similar extent in both SIT groups. Maximum work rate tended to increase to a greater extent in NIT (8.7%, d = 0.55) compared to PLA (4.7%, d = 0.31, p = 0.073). Fatigue index, calculated by the change in mean power from the first to the last sprint, tended to be reduced following SIT in NIT compared to PLA (PLA: 7.3 ± 7.4%, NIT: 0.5 ± 7.1%, p = 0.058).ConclusionsWhile dietary nitrate supplementation does not augment improvements to V⋅O2Max and VT following SIT, it may improve WRmax and indices of repeated high-intensity exercise.