Dietary nitrate does not enhance running performance in elite cross-country skiers

O. Peacock, A.E. TjØnna, P. James, U. WislØff, B. Welde, N. Böhlke, A.A. Smith, K. Stokes, C. Cook, O. Sandbakk

Research output: Contribution to journalArticle

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Abstract

Purpose: The objective of this study is to examine the effects of acute ingestion of dietary nitrate on endurance running performance in highly trained cross-country skiers. Dietary nitrate has been shown to reduce the oxygen cost of submaximal exercise and improve tolerance of high-intensity exercise, but it is not known if this holds true for highly trained endurance athletes. Methods: Ten male junior cross-country skiers (V̇O2max 70 mL•kg•min) each completed two trials in a randomized, double-blind design. Participants ingested potassium nitrate (614-mg nitrate) or a nitrate-free placebo 2.5 h before two 5-min submaximal tests on a treadmill at 10 km•h-1 (55% of V̇O2max) and 14 km•h -1(75% of V̇O2max), followed by a 5-km running time trial on an indoor track. Results: Plasma nitrite concentrations were higher after nitrate supplementation (325 ± 95 nmol•L) compared with placebo (143 ± 59 nmol•L, P < 0.001). There was no significant difference in 5-km time-trial performance between nitrate (1005 ± 53 s) and placebo treatments (996 ± 49 s, P = 0.12). The oxygen cost of submaximal running was not significantly different between placebo and nitrate trials at 10 km•h (both 2.84 ± 0.34 L•min) and 14 km•h (3.89 ± 0.39 vs. 3.77 ± 0.62 L•min). ConclusionS: Acute ingestion of dietary nitrate may not represent an effective strategy for reducing the oxygen cost of submaximal exercise or for enhancing endurance exercise performance in highly trained cross-country skiers. © 2012 by the American College of Sports Medicine.
Original languageEnglish
Pages (from-to)2213-2219
Number of pages7
JournalMedicine and Science in Sports and Exercise
Volume44
Issue number11
DOIs
Publication statusPublished - 2012
Externally publishedYes

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Running
Nitrates
Placebos
Exercise
Oxygen
Costs and Cost Analysis
Eating
Exercise Tolerance
Nitrites
Athletes

Cite this

Peacock, O., TjØnna, A. E., James, P., WislØff, U., Welde, B., Böhlke, N., ... Sandbakk, O. (2012). Dietary nitrate does not enhance running performance in elite cross-country skiers. Medicine and Science in Sports and Exercise, 44(11), 2213-2219. https://doi.org/10.1249/MSS.0b013e3182640f48
Peacock, O. ; TjØnna, A.E. ; James, P. ; WislØff, U. ; Welde, B. ; Böhlke, N. ; Smith, A.A. ; Stokes, K. ; Cook, C. ; Sandbakk, O. / Dietary nitrate does not enhance running performance in elite cross-country skiers. In: Medicine and Science in Sports and Exercise. 2012 ; Vol. 44, No. 11. pp. 2213-2219.
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abstract = "Purpose: The objective of this study is to examine the effects of acute ingestion of dietary nitrate on endurance running performance in highly trained cross-country skiers. Dietary nitrate has been shown to reduce the oxygen cost of submaximal exercise and improve tolerance of high-intensity exercise, but it is not known if this holds true for highly trained endurance athletes. Methods: Ten male junior cross-country skiers (V̇O2max 70 mL•kg•min) each completed two trials in a randomized, double-blind design. Participants ingested potassium nitrate (614-mg nitrate) or a nitrate-free placebo 2.5 h before two 5-min submaximal tests on a treadmill at 10 km•h-1 (55{\%} of V̇O2max) and 14 km•h -1(75{\%} of V̇O2max), followed by a 5-km running time trial on an indoor track. Results: Plasma nitrite concentrations were higher after nitrate supplementation (325 ± 95 nmol•L) compared with placebo (143 ± 59 nmol•L, P < 0.001). There was no significant difference in 5-km time-trial performance between nitrate (1005 ± 53 s) and placebo treatments (996 ± 49 s, P = 0.12). The oxygen cost of submaximal running was not significantly different between placebo and nitrate trials at 10 km•h (both 2.84 ± 0.34 L•min) and 14 km•h (3.89 ± 0.39 vs. 3.77 ± 0.62 L•min). ConclusionS: Acute ingestion of dietary nitrate may not represent an effective strategy for reducing the oxygen cost of submaximal exercise or for enhancing endurance exercise performance in highly trained cross-country skiers. {\circledC} 2012 by the American College of Sports Medicine.",
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Peacock, O, TjØnna, AE, James, P, WislØff, U, Welde, B, Böhlke, N, Smith, AA, Stokes, K, Cook, C & Sandbakk, O 2012, 'Dietary nitrate does not enhance running performance in elite cross-country skiers', Medicine and Science in Sports and Exercise, vol. 44, no. 11, pp. 2213-2219. https://doi.org/10.1249/MSS.0b013e3182640f48

Dietary nitrate does not enhance running performance in elite cross-country skiers. / Peacock, O.; TjØnna, A.E.; James, P.; WislØff, U.; Welde, B.; Böhlke, N.; Smith, A.A.; Stokes, K.; Cook, C.; Sandbakk, O.

In: Medicine and Science in Sports and Exercise, Vol. 44, No. 11, 2012, p. 2213-2219.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Dietary nitrate does not enhance running performance in elite cross-country skiers

AU - Peacock, O.

AU - TjØnna, A.E.

AU - James, P.

AU - WislØff, U.

AU - Welde, B.

AU - Böhlke, N.

AU - Smith, A.A.

AU - Stokes, K.

AU - Cook, C.

AU - Sandbakk, O.

N1 - Cited By :43 Export Date: 25 May 2017

PY - 2012

Y1 - 2012

N2 - Purpose: The objective of this study is to examine the effects of acute ingestion of dietary nitrate on endurance running performance in highly trained cross-country skiers. Dietary nitrate has been shown to reduce the oxygen cost of submaximal exercise and improve tolerance of high-intensity exercise, but it is not known if this holds true for highly trained endurance athletes. Methods: Ten male junior cross-country skiers (V̇O2max 70 mL•kg•min) each completed two trials in a randomized, double-blind design. Participants ingested potassium nitrate (614-mg nitrate) or a nitrate-free placebo 2.5 h before two 5-min submaximal tests on a treadmill at 10 km•h-1 (55% of V̇O2max) and 14 km•h -1(75% of V̇O2max), followed by a 5-km running time trial on an indoor track. Results: Plasma nitrite concentrations were higher after nitrate supplementation (325 ± 95 nmol•L) compared with placebo (143 ± 59 nmol•L, P < 0.001). There was no significant difference in 5-km time-trial performance between nitrate (1005 ± 53 s) and placebo treatments (996 ± 49 s, P = 0.12). The oxygen cost of submaximal running was not significantly different between placebo and nitrate trials at 10 km•h (both 2.84 ± 0.34 L•min) and 14 km•h (3.89 ± 0.39 vs. 3.77 ± 0.62 L•min). ConclusionS: Acute ingestion of dietary nitrate may not represent an effective strategy for reducing the oxygen cost of submaximal exercise or for enhancing endurance exercise performance in highly trained cross-country skiers. © 2012 by the American College of Sports Medicine.

AB - Purpose: The objective of this study is to examine the effects of acute ingestion of dietary nitrate on endurance running performance in highly trained cross-country skiers. Dietary nitrate has been shown to reduce the oxygen cost of submaximal exercise and improve tolerance of high-intensity exercise, but it is not known if this holds true for highly trained endurance athletes. Methods: Ten male junior cross-country skiers (V̇O2max 70 mL•kg•min) each completed two trials in a randomized, double-blind design. Participants ingested potassium nitrate (614-mg nitrate) or a nitrate-free placebo 2.5 h before two 5-min submaximal tests on a treadmill at 10 km•h-1 (55% of V̇O2max) and 14 km•h -1(75% of V̇O2max), followed by a 5-km running time trial on an indoor track. Results: Plasma nitrite concentrations were higher after nitrate supplementation (325 ± 95 nmol•L) compared with placebo (143 ± 59 nmol•L, P < 0.001). There was no significant difference in 5-km time-trial performance between nitrate (1005 ± 53 s) and placebo treatments (996 ± 49 s, P = 0.12). The oxygen cost of submaximal running was not significantly different between placebo and nitrate trials at 10 km•h (both 2.84 ± 0.34 L•min) and 14 km•h (3.89 ± 0.39 vs. 3.77 ± 0.62 L•min). ConclusionS: Acute ingestion of dietary nitrate may not represent an effective strategy for reducing the oxygen cost of submaximal exercise or for enhancing endurance exercise performance in highly trained cross-country skiers. © 2012 by the American College of Sports Medicine.

KW - Ergogenic aid

KW - nitrate supplementation

KW - nitric oxide metabolites

KW - oxygen uptake

U2 - 10.1249/MSS.0b013e3182640f48

DO - 10.1249/MSS.0b013e3182640f48

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JO - Medicine Science in Sports Exercise

JF - Medicine Science in Sports Exercise

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