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
©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
Publish Date
Received: 14-01-2014
Accepted: 24-02-2014
Published (online): 01-09-2014
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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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