Effect of sodium bicarbonate and Beta-alanine on repeated sprints during intermittent exercise performed in hypoxia.
OBJECTIVE
To investigate the separate and combined effects of sodium bicarbonate and beta-alanine supplementation on repeated sprints during simulated match play performed in hypoxia.


METHODS
Study A: 20 recreationally active participants performed two trials following acute supplementation with either sodium bicarbonate (0.3 g·kg-1BM) or placebo (maltodextrin). Study B: 16 recreationally active participants were supplemented with either a placebo or beta-alanine for 5 weeks (6.4 g·day-1 for 4 weeks, 3.2 g·day-1 for 1 week), and performed one trial before supplementation (with maltodextrin) and two following supplementation (with sodium bicarbonate and maltodextrin). Trials consisted of 3 sets of 5 × 6 s repeated sprints performed during a football specific intermittent treadmill protocol performed in hypoxia (15.5% O2). Mean (MPO) and peak (PPO) power output were recorded as the performance measures.


RESULTS
Study A: Overall MPO was lower with sodium bicarbonate than placebo (p = .02, 539.4 ± 84.5 vs. 554.0 ± 84.6 W), although there was no effect across sets (all p > .05). Study B: There was no effect of beta-alanine, or cosupplementation with sodium bicarbonate, on either parameter, although there was a trend toward higher MPO with sodium bicarbonate (p = .07).


CONCLUSIONS
The effect of sodium bicarbonate on repeated sprints was equivocal, although there was no effect of beta-alanine or cosupplementation with sodium bicarbonate. Individual variation may have contributed to differences in results with sodium bicarbonate, although the lack of an effect with beta-alanine suggests this type of exercise may not be influenced by increased buffering capacity.
Sport, Health and Performance Enhancement (SHAPE) Research Group, Nottingham Trent University, Nottingham, UK.
Bryan
B
Saunders
Craig
C
Sale
Roger C
RC
Harris
Caroline
C
Sunderland
D000293:Adolescent; D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D019587:Dietary Supplements; D005080:Exercise Test; D005538:Football; D006801:Humans; D000860:Hypoxia; D008297:Male; D005082:Physical Exertion / Q000187:drug effects*; D012420:Running / Q000502:physiology*; D012916:Soccer; D017693:Sodium Bicarbonate / Q000494:pharmacology*; D055815:Young Adult; D015091:beta-Alanine / Q000494:pharmacology*
D015091:beta-Alanine; D017693:Sodium Bicarbonate