The authors from Madrid, Spain, recruited 27 subjects to receive eitherย 4 grams a day of beta-alanine powder or placebo over the four-week study period to assess effects on neuromuscular fatigue in individuals engaging in HIFT and subsequent sports performance.ย
Results showed that beta-alanine supplementation improves measures of vertical jump and power, leading the researchers to conclude that a “four-week beta-alanine intake program demonstrated an improvement in the capacity of subjects.”
Neuromuscular fatigueโ
Beta-alanine, a non-essential amino acid found in the diet and produced through nucleotide catabolism, isย significant for muscle performanceโย due to its role in carnosine synthesis.ย
Carnosine is abundant in skeletal muscle and acts as a buffer, antioxidant andย ATPase activatorโ.ย Fast twitch muscle fibers contain more carnosine than slow twitch fibers, benefitingย athletes in high-intensity sportsโ, and ฮฒ-Alanine supplementation hasย been shownย to boost muscle carnosine levels,ย enhancing performance and delaying fatigueโ.
HIFT combines various exercises to improveย strength, endurance and overall fitnessโ. It primarily relies onย phosphocreatine for ATP resynthesisโ, however, phosphocreatine reserves are typically depleted within 10 to 30 seconds of HIFT, resulting in neuromuscular fatigue.
Study detailsโ
All study participants possessed over 18 months of experience in resistance training and participated in HIFT on the first day to induce fatigue and work close to their VO2 max. After four weeks of supplementation or placebo,ย they repeated the exercise experiment.
The researchers measured blood samples before and after workouts, assessed muscular fatigue through validated tests and asked participants to rate their level of exertion following workouts.ย
Results showed that only participants in the supplemented group experienced statistically significant changes in the sports performance variables, specifically vertical jump and jumping power. No alterationsย were observedย in any other variables, including fatigue, metabolic intensity of exercise or perceived intensity.
The researchers suggested that the improvement may be related to the antioxidant effects of beta-alanine supplementation, its involvement in the protection of glycation and its relationship with the generation of carnosine.
โThese effectsย serve toย buffer the drop in pH generated by the accumulation of metabolic waste, which may increase muscle performance,โ they wrote.ย
The study noted that future research should extend the supplementation period to understand whether this would result in a more pronounced statistical difference between the study groups.
โIt would be beneficial to examine the impact of varying the dose administered to the subjects in the experimental group while ensuring that the dosage does not exceed a level that could potentially lead to adverse effects,โ they added.ย
Journal:ย Nutrientsโ
โEffects of ฮฒ-Alanine Supplementation on Subjects Performing High-Intensity Functional Training.โ
doi:ย 10.3390/nu16142340โ
Authors: Cimadevilla-Fernรกndez-Pola, E. et al.ย