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

David Muggeridge, Nicholas Sculthorpe, Philip James, Chris Easton

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Abstract

Objectives
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).

Design
Randomized control trial.

Methods
Twenty-seven untrained males (Age: 28 ± 7 y, Math Eq: 42 ± 7 ml kg−1 min–1) completed an incremental exercise test at the beginning and end of the study. Participants were matched for Math Eq 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).

Results
Following SIT, Math Eq (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).

Conclusions
While dietary nitrate supplementation does not augment improvements to Math Eq and VT following SIT, it may improve WRmax and indices of repeated high-intensity exercise
Original languageEnglish
JournalJournal of Science and Medicine in Sport
Early online date21 May 2016
DOIs
Publication statusE-pub ahead of print - 21 May 2016

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Dietary Supplements
Nitrates
High-Intensity Interval Training
Exercise Test
Fatigue
Gels
Placebos
Control Groups

Cite this

@article{2b02fb9175c24d08887a41b89de3dd6b,
title = "The effects of dietary nitrate supplementation on the adaptations to sprint interval training in previously untrained males",
abstract = "ObjectivesDietary 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, Math Eq: 42 ± 7 ml kg−1 min–1) completed an incremental exercise test at the beginning and end of the study. Participants were matched for Math Eq 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, Math Eq (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 Math Eq and VT following SIT, it may improve WRmax and indices of repeated high-intensity exercise",
author = "David Muggeridge and Nicholas Sculthorpe and Philip James and Chris Easton",
year = "2016",
month = "5",
day = "21",
doi = "10.1016/j.jsams.2016.04.014",
language = "English",
journal = "Journal of Science and Medicine in Sport",
issn = "1440-2440",
publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - The effects of dietary nitrate supplementation on the adaptations to sprint interval training in previously untrained males

AU - Muggeridge, David

AU - Sculthorpe, Nicholas

AU - James, Philip

AU - Easton, Chris

PY - 2016/5/21

Y1 - 2016/5/21

N2 - ObjectivesDietary 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, Math Eq: 42 ± 7 ml kg−1 min–1) completed an incremental exercise test at the beginning and end of the study. Participants were matched for Math Eq 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, Math Eq (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 Math Eq and VT following SIT, it may improve WRmax and indices of repeated high-intensity exercise

AB - ObjectivesDietary 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, Math Eq: 42 ± 7 ml kg−1 min–1) completed an incremental exercise test at the beginning and end of the study. Participants were matched for Math Eq 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, Math Eq (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 Math Eq and VT following SIT, it may improve WRmax and indices of repeated high-intensity exercise

U2 - 10.1016/j.jsams.2016.04.014

DO - 10.1016/j.jsams.2016.04.014

M3 - Article

JO - Journal of Science and Medicine in Sport

JF - Journal of Science and Medicine in Sport

SN - 1440-2440

ER -