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Discrete physiological effects of beetroot juice and potassium nitrate supplementation following 4 weeks sprint interval training

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posted on 26.03.2018 by Christopher Thompson, Anni Vanhatalo, Stefan Kadach, Lee J. Wylie, Jonathan Fulford, Scott K. Ferguson, Jamie R. Blackwell, Stephen Bailey, Andrew M. Jones
The physiological and exercise performance adaptations to sprint interval training (SIT) may be modified by dietary nitrate (NO3-) supplementation. However, it is possible that different types of NO3- supplementation evoke divergent physiological and performance adaptations to SIT. The purpose of this study was to compare the effects of 4 weeks SIT with and without concurrent dietary NO3- supplementation administered as either NO3--rich beetroot juice (BR) or potassium NO3- (KNO3). Thirty recreationally-active subjects completed a battery of exercise tests before and after a 4 week intervention in which they were allocated to one of three groups: 1) SIT undertaken without dietary NO3- supplementation (SIT); 2) SIT accompanied by concurrent BR supplementation (SIT+BR); or 3) SIT accompanied by concurrent KNO3 supplementation (SIT+KNO3). During severe-intensity exercise, VO2peak and time to task failure were improved to a greater extent with SIT+BR than SIT and SIT+KNO3 (P<0.05). There was also a greater reduction in the accumulation of muscle lactate at 3-min of severe-intensity exercise in SIT+BR compared to SIT+KNO3 (P<0.05). Plasma [NO2-] fell to a greater extent during severe-intensity exercise in SIT+BR compared to SIT and SIT+KNO3 (P<0.05). There were no differences between groups in the reduction in the muscle phosphocreatine recovery time constant from pre- to post-intervention (P>0.05). These findings indicate that 4 weeks SIT with concurrent BR supplementation results in greater exercise capacity adaptations compared to SIT alone and SIT with concurrent KNO3 supplementation. This may be the result of greater NO-mediated signalling in SIT+BR compared to SIT+KNO3.

History

School

  • Sport, Exercise and Health Sciences

Published in

Journal of Applied Physiology

Citation

THOMPSON, C. ... et al, 2018. Discrete physiological effects of beetroot juice and potassium nitrate supplementation following 4 weeks sprint interval training. Journal of Applied Physiology, 124 (6), pp.1519-1528.

Publisher

© American Physiological Society

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

27/02/2018

Publication date

2018

Notes

This paper was accepted for publication in the journal Journal of Applied Physiology and the definitive published version is available at https://doi.org/10.1152/japplphysiol.00047.2018

ISSN

8750-7587

eISSN

1522-1601

Language

en

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