Christopher L Buck1, Timothy Henry2, Kym Guelfi2, Brian Dawson2, Lars R McNaughton3, Karen Wallman2. 1. School of Sport Science, Exercise and Health, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia. buckc01@student.uwa.edu.au. 2. School of Sport Science, Exercise and Health, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia. 3. Department of Sport and Physical Activity, Edge Hill University, St Helens Road, Ormskirk, Lancashire, L39 4QP, UK.
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.
RCT Entities:
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.
Authors: Stephen J Bailey; Paul Winyard; Anni Vanhatalo; Jamie R Blackwell; Fred J Dimenna; Daryl P Wilkerson; Joanna Tarr; Nigel Benjamin; Andrew M Jones Journal: J Appl Physiol (1985) Date: 2009-08-06
Authors: Stephen J Bailey; Jonathan Fulford; Anni Vanhatalo; Paul G Winyard; Jamie R Blackwell; Fred J DiMenna; Daryl P Wilkerson; Nigel Benjamin; Andrew M Jones Journal: J Appl Physiol (1985) Date: 2010-05-13
Authors: Xingbin Yang; Catherine P Bondonno; Adeline Indrawan; Jonathan M Hodgson; Kevin D Croft Journal: Free Radic Biol Med Date: 2012-12-12 Impact factor: 7.376
Authors: Chad M Kerksick; Colin D Wilborn; Michael D Roberts; Abbie Smith-Ryan; Susan M Kleiner; Ralf Jäger; Rick Collins; Mathew Cooke; Jaci N Davis; Elfego Galvan; Mike Greenwood; Lonnie M Lowery; Robert Wildman; Jose Antonio; Richard B Kreider Journal: J Int Soc Sports Nutr Date: 2018-08-01 Impact factor: 5.150
Authors: Raúl Domínguez; José Luis Maté-Muñoz; Eduardo Cuenca; Pablo García-Fernández; Fernando Mata-Ordoñez; María Carmen Lozano-Estevan; Pablo Veiga-Herreros; Sandro Fernandes da Silva; Manuel Vicente Garnacho-Castaño Journal: J Int Soc Sports Nutr Date: 2018-01-05 Impact factor: 5.150
Authors: Kate A Wickham; Devin G McCarthy; Jamie M Pereira; Daniel T Cervone; Lex B Verdijk; Luc J C van Loon; Geoffrey A Power; Lawrence L Spriet Journal: Physiol Rep Date: 2019-01
Authors: Jonathon W Senefeld; Chad C Wiggins; Riley J Regimbal; Paolo B Dominelli; Sarah E Baker; Michael J Joyner Journal: Med Sci Sports Exerc Date: 2020-10