β-alanine supplementation improves YoYo intermittent recovery test performance

Area of Science:

• Sports Science
• Exercise Physiology
• Nutritional Supplementation

Background:

• Beta-alanine supplementation is known to enhance high-intensity exercise performance.
• Its effects on intermittent exercise, particularly repeated sprint ability, are less understood.
• This study focused on the impact of beta-alanine on YoYo Intermittent Recovery Test Level 2 (YoYo IR2) performance.

Purpose of the Study:

• To investigate the effects of 12-week beta-alanine supplementation on YoYo IR2 performance in amateur footballers.
• To determine if beta-alanine supplementation can improve intermittent exercise capacity during a competitive season.
• To compare the effects of beta-alanine versus placebo on YoYo IR2 performance.

Main Methods:

• Seventeen amateur footballers were divided into two groups: placebo (PLA) and beta-alanine (BA).
• Supplementation lasted 12 weeks, coinciding with the competitive season.
• YoYo IR2 performance was assessed before and after the supplementation period, with data analyzed using a two-factor ANOVA.

Main Results:

• No significant difference in pre-supplementation YoYo IR2 scores between the PLA and BA groups.
• Beta-alanine supplementation led to a significant improvement in YoYo IR2 performance (+34.3%, P ≤ 0.001).
• The placebo group showed a decrease in YoYo IR2 performance (-7.3%, P = 0.24), with only 2 of 8 players improving.

Conclusions:

• Twelve weeks of beta-alanine supplementation effectively improved YoYo IR2 performance in amateur footballers.
• The improvement is likely attributed to enhanced muscle buffering capacity, mitigating intracellular pH reduction during intense intermittent exercise.
• Beta-alanine supplementation appears beneficial for high-intensity intermittent exercise capacity in athletes.