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Effects of sodium phosphate and beetroot juice supplementation on repeated-sprint ability in females

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Abstract

Introduction

Sodium phosphate (SP) and beetroot juice (BJ) supplementation was assessed on repeated-sprint ability (RSA).

Methods

Thirteen female team-sport participants completed four trials: (1) SP and BJ (SP + BJ), (2) SP and placebo (for BJ), (3) BJ and placebo (for SP) and (4) placebo (for SP + BJ), with ~21 days separating each trial. After each trial, participants performed a simulated team-game circuit (STGC) consisting of four 15 min quarters, with a 6 × 20-m repeated-sprint set performed at the start, half-time and end.

Results

Total sprint times were between 0.95–1.30 and 0.83–1.12 s faster for each RSA set and 3.25 and 3.12 s faster overall (~5 % improvement) after SP compared with placebo and BJ, respectively (p = 0.02 for sets 1, 2 and overall; Cohen’s effect size: d = −0.51 to −0.90 for all sets and overall). Additionally, total sprint times were 0.48 s faster after SP + BJ compared with placebo (set 2; p = 0.05, ~2 % improvement). Furthermore, best sprints were 0.13–0.23 and 0.15–0.20 s faster (~6 % improvement; p < 0.01) after SP compared with placebo and BJ, respectively, for all sets (d = −0.54 to −0.89).

Conclusion

SP improved RSA in team-sport, female athletes when fresh (set 1) and during the later sets of a STGC (sets 2 and 3). Specifically, total and best sprint times were faster after SP compared with placebo and BJ.

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Abbreviations

2,3-DPG:

2,3-Diphosphoglycerate

ATP:

Adenosine triphosphate

ANOVA:

Analysis of variance

Bpm:

Beats per minute

BJ:

Beetroot juice

BS:

Best sprint

CV:

Coefficient of variation

d :

Effect sizes

FFM:

Fat free mass

HR:

Heart rate

\( {\dot{\text{V}}\text{O}}_{{2{ \hbox{max} }}} \) :

Maximal oxygen uptake

PCr:

Phosphocreatine

RPE:

Ratings of perceived exertion

RBC:

Red blood cells

RSA:

Repeated-sprint ability

STGC:

Simulated team-game circuit

SP:

Sodium phosphate

TT:

Time-trial

TS:

Total sprint

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Acknowledgments

The authors acknowledge the assistance of PathWest Laboratory Medicine, Royal Perth Hospital, Perth, Australia for the analysis of serum phosphate, the University of Western Australia Centre for Metabolomics for 2,3-DPG analysis and Royal Perth Hospital, Medical Research Foundation for plasma nitrate analysis.

Ethical standard

This work was funded by the University of Western Australia. There are no relevant conflicts of interest for all authors. All participants provided written informed consent prior to commencing testing.

Author information

Authors and Affiliations

  1. School of Sport Science, Exercise and Health, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia

    Christopher L. Buck, Timothy Henry, Kym Guelfi, Brian Dawson & Karen Wallman

  2. Department of Sport and Physical Activity, Edge Hill University, St Helens Road, Ormskirk, Lancashire, L39 4QP, UK

    Lars R. McNaughton

Authors
  1. Christopher L. Buck
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  2. Timothy Henry
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  3. Kym Guelfi
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  4. Brian Dawson
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  5. Lars R. McNaughton
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  6. Karen Wallman
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Corresponding author

Correspondence to Christopher L. Buck.

Additional information

Communicated by Michael Lindinger.

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Buck, C.L., Henry, T., Guelfi, K. et al. Effects of sodium phosphate and beetroot juice supplementation on repeated-sprint ability in females. Eur J Appl Physiol 115, 2205–2213 (2015). https://doi.org/10.1007/s00421-015-3201-1

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  • DOI: https://doi.org/10.1007/s00421-015-3201-1

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