Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2014) 13, 469 - 475

Research article
Sodium Phosphate Supplementation and Time Trial Performance in Female Cyclists
Christopher L. Buck1, , Brian Dawson1, Kym J. Guelfi1, Lars McNaughton2, Karen E. Wallman1
Author Information
1 School of Sport Science, Exercise and Health, The University of Western Australia, Crawley, WA, 6009, Australia
2 Faculty of Arts and Sciences Sport and Physical Activity, Edge Hill University, Lancashire, United Kingdom

Christopher L. Buck
✉ School of Sports Science, Exercise and Health, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia
Email: buckc01@student.uwa.edu.au
Publish Date
Received: 14-01-2014
Accepted: 24-02-2014
Published (online): 01-09-2014
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ABSTRACT

This study investigated the effects of three doses of sodium phosphate (SP) supplementation on cycling 500 kJ (119.5 Kcal) time trial (TT) performance in female cyclists. Thirteen cyclists participated in a randomised, Latin-square design study where they completed four separate trials after ingesting either a placebo, or one of three different doses (25, 50 or 75 mg·kg-1 fat free mass: FFM) of trisodium phosphate dodecahydrate which was split into four equal doses a day for six days. On the day after the loading phase, the TT was performed on a cycle ergometer. Serum phosphate blood samples were taken at rest both before and after each loading protocol, while a ~21 day washout period separated each loading phase. No significant differences in TT performance were observed between any of the supplementation protocols (p = 0.73) with average completion times for the 25, 50 or 75 mg·kg-1 FFM being, 42:21 ± 07:53, 40:55 ± 07:33 and 40:38 ± 07:20 min respectively, and 40:39 ± 07:51 min for the placebo. Likewise, average and peak power output did not significantly differ between trials (p = 0.06 and p = 0.46, respectively). Consequently, 500 kJ cycling TT performance was not different in any of the supplementation protocols in female cyclists.

Key words: Ergogenics, endurance performance, 2,3-DPG


           Key Points
  • No significant benefit of a 25, 50 or 75 mg·kg of FFM dose of sodium phosphate was found on 500 kJ (119.5 Kcal) TT cycle performance in female cyclists.
  • Females of differing fitness levels responded similarly to sodium phosphate supplementation.
  • Due to the possibility of individual responders to either the 50 or 75 mg·kg of FFM loading protocols, competitive cyclists should trial these doses prior to competition.
 
 
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