Additive Benefits of β-Alanine Supplementation and Sprint-Interval Training
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Purpose: The present study investigated the effects of β-alanine supplementation only, and in combination with sprint-interval training (SIT), on training intensity, and energy provision and performance during exhaustive supramaximal-intensity cycling and a 4- and 10-km time trial (TT). Methods: Fourteen trained cyclists (VO2max = 4.5 ± 0.6 L·min-1) participated in this placebo-controlled, double-blind study. Subjects performed a supramaximal cycling test to exhaustion (equivalent to 120% VO2max) and a 4- and 10-km TT and 4 x 1-km sprints at three time points: before and after 28 d of supplementation loading (6.4 g·d-1) with β-alanine (n = 7) or a placebo (n = 7), and after a 5-wk supervised, SIT program performed twice weekly (repeated 1- km cycling sprints) whilst maintaining supplementation with β-alanine (1.2 g·d-1) or a placebo. Results: Following the loading period, sprint 3 and 4 of the 4 x 1-km sprint intervals were improved with β-alanine supplementation (4.5 ± 3.4% and 7.0 ± 4.0%; P < 0.05, respectively). After 5 wk of SIT, training intensity increased in both groups but the change was greater with β- alanine supplementation (9.9 ± 5.0% vs. 4.9 ± 5.0; P = 0.04). β-alanine supplementation also improved supramaximal cycling time to exhaustion to a greater extent than placebo (14.9 ± 9.2% vs. 9.0 ± 6.9%; P = 0.04), while 4- and 10-km TT performance improved to a similar magnitude in both groups. Following SIT, β-alanine also increased anaerobic capacity (5.5 ± 4.2%; P = 0.04), while VO2peak increased similarly in each group (3.1 ± 2.9% vs. 3.5 ± 2.9%; P < 0.05). Conclusion: These findings indicate that β-alanine supplementation enhances training intensity during SIT and provides additional benefits to exhaustive supramaximal cycling compared to SIT alone.
Medicine and Science in Sports and Exercise
© 2016 LWW. This is a non-final version of an article published in final form in Medicine and Science in Sports and Exercise, 48(12):2417–2425, DEC 2016. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal link for access to the definitive, published version.
Human Movement and Sports Science not elsewhere classified