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Nutrition and Biochemistry

Effects of sodium phosphate and caffeine loading on repeated-sprint ability

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Pages 1971-1979 | Accepted 28 Feb 2015, Published online: 31 Mar 2015
 

Abstract

The effects of sodium phosphate and caffeine supplementation were assessed on repeated-sprint ability. Using a randomised, double-blind, Latin-square design, 12 female, team-sport players participated in four trials: (1) sodium phosphate and caffeine, (2) sodium phosphate and placebo (for caffeine), (3) caffeine and placebo (for sodium phosphate) and (4) placebo (for sodium phosphate and caffeine), with ~21 days separating each trial. After each trial, participants performed a simulated team-game circuit (4 × 15 min quarters) with 6 × 20-m repeated-sprints performed once before (Set 1), at half-time (Set 2), and after end (Set 3). Total sprint times were faster after sodium phosphate and caffeine supplementation compared with placebo (Set 1: = 0.003; Set 2: = −0.51; Set 3: < 0.001; overall: = 0.020), caffeine (Set 3: = 0.004; overall: = 0.033) and sodium phosphate (Set 3: = −0.67). Furthermore, total sprint times were faster after sodium phosphate supplementation compared with placebo (Set 1: = −0.52; Set 3: = −0.58). Best sprint results were faster after sodium phosphate and caffeine supplementation compared with placebo (Set 3: = 0.007, = −0.90) and caffeine (Set 3: = 0.024, = −0.73). Best sprint times were also faster after sodium phosphate supplementation compared with placebo (= −0.54 to −0.61 for all sets). Sodium phosphate and combined sodium phosphate and caffeine loading improved repeated-sprint ability.

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