No differences between beetroot juice and placebo on competitive 5-km running performance: A double-blind, placebo-controlled trial
Hurst, P. and Coleman, D. 2020. No differences between beetroot juice and placebo on competitive 5-km running performance: A double-blind, placebo-controlled trial. International Journal of Sports Nutrition and Exercise Metabolism.
|Authors||Hurst, P. and Coleman, D.|
We examined the effect of beetroot juice on endurance running performance in “real-world” competitive settings. One-hundred recreational runners (54% male; mean ± standard deviation, age = 33.3 ± 12.3 years, training history = 11.9 ± 8.1 years, hours per week training = 5.9 ± 3.5) completed a quasi-randomised, double-blind, placebo-controlled study of 5-km competitive time-trials. Participants performed four trials separated by one week in the order of pre-baseline, two experimental, and one post-baseline. Experimental trials consisted of the administration of 70-mL nitrate rich beetroot juice (containing ~4.1 mmol of nitrate, Beet It Sport®) or nitrate depleted placebo (containing ~0.04 mmol of nitrate, Beet It Sport®) 2.5 hours prior to time-trials. Time to complete 5-km was recorded for each trial. No differences were shown between pre- and post-baseline (P = 0.128, CV = 2.66%). The average of these two trials is therefore used as baseline. Compared to baseline, participants ran faster with beetroot juice (mean differences = 22.2 ± 5.0 s, P < 0.001, d = 0.08) and placebo (22.9 ± 4.5 s, P < 0.001, d = 0.09). No differences in times were shown between beetroot juice or placebo (0.8 ± 5.7 s, P < 0.875, d = 0.00). These results indicate that an acute dose of beetroot juice does not improve competitive 5-km time-trial performance in recreational runners compared to placebo.
|Keywords||Dietary nitrate; Ecological validity; Ergogenic aids; Nutrition; Sport supplements|
|Journal||International Journal of Sports Nutrition and Exercise Metabolism|
|Publication process dates|
|Accepted||24 Apr 2020|
|Deposited||07 May 2020|
|Accepted author manuscript|
Bailey, S. J., Fulford, J., Vanhatalo, A., Winyard, P. G., Blackwell, J. R., DiMenna, F. J., Wilkerson, D. P., Benjamin, N., & Jones, A. M. (2010). Dietary nitrate supplementation enhances muscle contractile efficiency during knee-extensor exercise in humans. Journal of Applied Physiology, 109(1), 135-148.
Bailey, S. J., Winyard, P. G., Vanhatalo, A., Blackwell, J. R., DiMenna, F. J., Wilkerson, D. P., & Jones, A. M. (2010). Acute L-arginine supplementation reduces the O2 cost of moderate-intensity exercise and enhances high-intensity exercise tolerance. Journal of Applied Physiology, 109(5), 1394-1403.
Betts, J. A., Gonzalez, J. T., Burke, L. M., Close, G. L., Garthe, I., James, L. J., Jeukendrup, A. E., Morton, J. P., Nieman, D. C., & Peeling, P. (2020). PRESENT 2020: Text Expanding on the Checklist for Proper Reporting of Evidence in Sport and Exercise Nutrition Trials. International Journal of Sport Nutrition and Exercise Metabolism, 1(aop), 1-12.
Burke, L. M., & Peeling, P. (2018). Methodologies for investigating performance changes with supplement use. International Journal of Sport Nutrition and Exercise Metabolism, 28(2), 159-169.
Cermak, N. M., Gibala, M. J., & Van Loon, L. J. (2012). Nitrate supplementation’s improvement of 10-km time-trial performance in trained cyclists. International Journal of Sport Nutrition and Exercise Metabolism, 22(1), 64-71.
Cermak, N. M., Res, P., Stinkens, R., Lundberg, J. O., Gibala, M. J., & Van Loon, L. J. (2012). No improvement in endurance performance after a single dose of beetroot juice. International Journal of Sport Nutrition and Exercise Metabolism, 22(6), 470-478.
Coggan, A. R., Leibowitz, J. L., Kadkhodayan, A., Thomas, D. P., Ramamurthy, S., Spearie, C. A., Waller, S., Farmer, M., & Peterson, L. R. (2015). Effect of acute dietary nitrate intake on maximal knee extensor speed and power in healthy men and women. Nitric Oxide, 48, 16-21.
Cohen, J. (1992). A power primer. Psychological Bulletin, 112(1), 155-159.
Cohen, J. (2013). Statistical power analysis for the behavioral sciences. Routledge.
Cooke, A., Kavussanu, M., McIntyre, D., & Ring, C. (2011). Effects of competition on endurance performance and the underlying psychological and physiological mechanisms. Biological Psychology, 86(3), 370-378.
Corbett, J., Barwood, M. J., Ouzounoglou, A., Thelwell, R., & Dicks, M. (2012). Influence of competition on performance and pacing during cycling exercise. Medicine and Science in Sports and Exercise, 44(3), 509-515.
Currell, K., & Jeukendrup, A. E. (2008). Validity, reliability and sensitivity of measures of sporting performance. Sports Medicine, 38(4), 297-316.
de Castro, T. F., Manoel, F. d. A., Figueiredo, D. H., Figueiredo, D. H., & Machado, F. A. (2019). Effect of beetroot juice supplementation on 10-km performance in recreational runners. Applied Physiology, Nutrition, and Metabolism, 44(1), 90-94.
Faul, F., Erdfelder, E., Buchner, A., & Lang, A.-G. (2009). Statistical power analyses using G* Power 3.1: Tests for correlation and regression analyses. Behavior Research Methods, 41(4), 1149-1160.
Garthe, I., & Maughan, R. J. (2018). Athletes and supplements: prevalence and perspectives. International Journal of Sport Nutrition and Exercise Metabolism, 28(2), 126-138.
Hoon, M. W., Johnson, N. A., Chapman, P. G., & Burke, L. M. (2013). The effect of nitrate supplementation on exercise performance in healthy individuals: a systematic review and meta-analysis. International Journal of Sport Nutrition and Exercise Metabolism, 23(5), 522-532.
Hopkins, W. G. (2015). Speadsheets for Analysis of Validity and Reliability. Sportsci, 19, 26-42.
Hopkins, W. G., Hawley, J. A., & Burke, L. M. (1999). Design and analysis of research on sport performance enhancement. Medicine and Science in Sports and Exercise, 31(3), 472-485.
Hurst, P., & Board, E. (2017). Reliability of 5-km running performance in a competitive environment. Measurement in Physical Education and Exercise Science, 21(1), 10-14.
Jodra, P., Domínguez, R., Sánchez-Oliver, A. J., Veiga-Herreros, P., & Bailey, S. J. (2020). Effect of Beetroot Juice Supplementation on Mood, Perceived Exertion, and Performance During a 30-Second Wingate Test. International Journal of Sports Physiology and Performance, 15(2), 243-248.
Jones, A. M. (2014). Dietary nitrate supplementation and exercise performance. Sports Medicine, 44(1), 35-45.
Jonvik, K. L., Nyakayiru, J., van Dijk, J.-W., Wardenaar, F. C., Van Loon, L. J., & Verdijk, L. B. (2017). Habitual dietary nitrate intake in highly trained athletes. International Journal of Sport Nutrition and Exercise Metabolism, 27(2), 148-157.
Jonvik, K. L., Nyakayiru, J., Van Dijk, J. W., Maase, K., Ballak, S., Senden, J., Van Loon, L., & Verdijk, L. B. (2018). Repeated-sprint performance and plasma responses following beetroot juice supplementation do not differ between recreational, competitive and elite sprint athletes. European Journal of Sport Science, 18(4), 524-533.
Kapil, V., Milsom, A. B., Okorie, M., Maleki-Toyserkani, S., Akram, F., Rehman, F., Arghandawi, S., Pearl, V., Benjamin, N., & Loukogeorgakis, S. (2010). Inorganic nitrate supplementation lowers blood pressure in humans: role for nitrite-derived NO. Hypertension, 56(2), 274-281.
Maughan, R. J., Burke, L. M., Dvorak, J., Larson-Meyer, D. E., Peeling, P., Phillips, S. M., Rawson, E. S., Walsh, N. P., Garthe, I., & Geyer, H. (2018). IOC consensus statement: dietary supplements and the high-performance athlete. International Journal of Sport Nutrition and Exercise Metabolism, 28(2), 104-125. https://doi.org/10.1123/ijsnem.2018-0020
McMahon, N. F., Leveritt, M. D., & Pavey, T. G. (2017). The effect of dietary nitrate supplementation on endurance exercise performance in healthy adults: a systematic review and meta-analysis. Sports Medicine, 47(4), 735-756.
Muggeridge, D. J., Howe, C. C., Spendiff, O., Pedlar, C., James, P. E., & Easton, C. (2013). The effects of a single dose of concentrated beetroot juice on performance in trained flatwater kayakers. International Journal of Sport Nutrition and Exercise Metabolism, 23(5), 498-506.
parkrun. (2020). parkrun. Retrieved 21/08/2019 from https://www.parkrun.org.uk/
Peeling, P., Cox, G. R., Bullock, N., & Burke, L. M. (2015). Beetroot juice improves on-water 500 m time-trial performance, and laboratory-based paddling economy in national and international-level kayak athletes. International Journal of Sport Nutrition and Exercise Metabolism, 25(3), 278-284.
Shannon, O. M., Barlow, M. J., Duckworth, L., Williams, E., Wort, G., Woods, D., Siervo, M., & O’Hara, J. P. (2017). Dietary nitrate supplementation enhances short but not longer duration running time-trial performance. European Journal of Applied Physiology, 117(4), 775-785.
Vanhatalo, A., Bailey, S. J., Blackwell, J. R., DiMenna, F. J., Pavey, T. G., Wilkerson, D. P., Benjamin, N., Winyard, P. G., & Jones, A. M. (2010). Acute and chronic effects of dietary nitrate supplementation on blood pressure and the physiological responses to moderate-intensity and incremental exercise. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 299(4), R1121-R1131.
Vanhatalo, A., Fulford, J., Bailey, S. J., Blackwell, J. R., Winyard, P. G., & Jones, A. M. (2011). Dietary nitrate reduces muscle metabolic perturbation and improves exercise tolerance in hypoxia. The Journal of physiology, 589(22), 5517-5528.
Webb, A. J., Patel, N., Loukogeorgakis, S., Okorie, M., Aboud, Z., Misra, S., Rashid, R., Miall, P., Deanfield, J., & Benjamin, N. (2008). Acute blood pressure lowering, vasoprotective, and antiplatelet properties of dietary nitrate via bioconversion to nitrite. Hypertension, 51(3), 784-790.
Williams, E. L., Jones, H. S., Sparks, S. A., Marchant, D. C., Midgley, A. W., & Mc Naughton, L. R. (2015). Competitor presence reduces internal attentional focus and improves 16.1 km cycling time trial performance. Journal of Science and Medicine in Sport, 18(4), 486-491.
Wylie, L. J., de Zevallos, J. O., Isidore, T., Nyman, L., Vanhatalo, A., Bailey, S. J., & Jones, A. M. (2016). Dose-dependent effects of dietary nitrate on the oxygen cost of moderate-intensity exercise: Acute vs. chronic supplementation. Nitric Oxide, 57, 30-39.
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