A six-week regimen of multicomponent circuit training improved aerobic capacity and running performance in untrained young adults, but adding daily beta-alanine supplementation yielded no additional physical performance benefits over exercise alone, according to a randomized, placebo-controlled trial published in BMC Sports Science, Medicine and Rehabilitation.
Researchers investigated whether chronic beta-alanine supplementation could augment functional gains when combined with structured physical training. While beta-alanine is recognized for elevating skeletal muscle carnosine levels and potentially assisting high-intensity exercise, scientific evidence evaluating its efficacy in untrained populations, particularly females, and within multicomponent training programs has remained limited.
The double-blind investigation initially randomized 46 healthy, untrained young adults with an average age of 22.3 years. A total of 43 participants completed the six-week intervention, comprising 23 individuals assigned to receive daily beta-alanine at a dose of 50 milligrams per kilogram of body weight and 20 participants assigned to an identical placebo regimen while both groups underwent progressive multicomponent circuit training.
Before and after the intervention, investigators assessed
Before and after the intervention, investigators assessed an extensive set of physiological and functional outcomes.
The study recorded complete outcome data across 43 participants, while shuttle-run performance and estimated VO₂max were evaluated in 41 individuals, consisting of 21 participants in the beta-alanine group and 20 in the placebo group. The circuit training program produced statistically significant improvements over time in shuttle-run performance and estimated VO₂max, but no significant time-by-treatment interactions were observed for estimated VO₂max, shuttle-run capacity, maximal voluntary isometric knee-extension torque, forced vital capacity, body composition, or blood lactate accumulation.
Biochemical analyses demonstrated significant time-by-treatment interactions for plasma histidine and post-exercise plasma carnosine concentrations, alongside training and supplementation effects on plasma beta-alanine levels. The authors concluded that training-induced adaptations drove the observed physiological improvements, emphasizing that elevations in circulating plasma carnosine following beta-alanine intake should not be assumed to reflect functional exercise enhancements.
In evaluating the cardiorespiratory assessments, the investigators observed
In evaluating the cardiorespiratory assessments, the investigators observed that progressive circuit training generated robust improvements over the six-week timeline, with both shuttle-run performance and estimated maximal oxygen uptake increasing significantly at p < 0.001. However, the addition of daily beta-alanine failed to produce an additive ergogenic effect, as evidenced by non-significant time-by-treatment interactions. Specifically, the statistical interaction between the intervention arms reached a p-value of 0.125 for shuttle-run capacity and a p-value of 0.073 for estimated maximal oxygen consumption, establishing that the functional gains were governed by the physical training stimulus rather than nutritional supplementation.
The investigation focused on a specific participant profile to address critical gaps in sports nutrition literature, where empirical data concerning untrained cohorts, female participants, and multicomponent exercise regimens remain sparse. The randomized sample consisted of healthy, untrained young adults presenting a mean baseline age of 22.3 years with a standard deviation of 1.7 years. Participants underwent double-blind allocation to either the active supplement regimen or an identical placebo control throughout the progressive training program.
While functional measurements, including maximal voluntary isometric knee-extension torque, forced vital capacity, anthropometric body composition, and blood lactate accumulation, demonstrated no significant time-by-treatment interactions, the blood plasma markers exhibited distinct patterns. Significant time-by-treatment interactions were confirmed at p < 0.05 for both plasma histidine concentrations and post-exercise plasma carnosine concentrations.
Methodological transparency and administrative milestones were formally documented
Methodological transparency and administrative milestones were formally documented through ClinicalTrials.gov under trial registration NCT07404540. The trial was retrospectively registered on January 29, 2026, and officially made available to the public on February 11, 2026, with the completed research accepted and published in BMC Sports Science, Medicine and Rehabilitation on November 12, 2026. Reflecting on their observations, the researchers highlighted the paramount importance of structured training-related adaptations. They specifically cautioned that elevations in post-exercise plasma carnosine concentrations should not be interpreted as evidence of functional athletic enhancement, providing a critical distinction between circulating metabolic biomarkers and actual physical performance in untrained individuals.
Subject of Research: Effects of beta-alanine supplementation during multicomponent circuit training on physical performance and plasma metabolites in untrained young adults
Article Title: Effects of β-alanine supplementation and multicomponent circuit training on aerobic capacity, performance, and plasma metabolites in untrained young adults: a randomized, placebo-controlled trial with double-blind supplementation
Article References: Pinter, G., Csala, D., Tekus, E.,
Article References: Pinter, G., Csala, D., Tekus, E., Kaj, M., Vaczi, M., Eros, K., Gallyas, F., Jr., & Wilhelm, M. (2026). Effects of β-alanine supplementation and multicomponent circuit training on aerobic capacity, performance, and plasma metabolites in untrained young adults: a randomized, placebo-controlled trial with double-blind supplementation. BMC Sports Science, Medicine and Rehabilitation. https://doi.org/10.1186/s13102-026-02238-y
DOI:10.1186/s13102-026-02238-y
Keywords: beta-alanine, multicomponent circuit training, carnosine, histidine, untrained young adults, randomized controlled trial, double-blind trial, placebo-controlled trial, shuttle-run performance, estimated VO2max, knee-extension torque, forced vital capacity, blood lactate accumulation, plasma metabolites, body composition, aerobic capacity, exercise physiology
News. Beta-Alanine Fails to Boost Circuit Training Gains in Young Adults. Scienmag
