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Beta-Alanine Supplementation Improves Isotonic Strength Endurance Performance Without Altering Psychological
Cecilia L Colini1, Emerson L Teixeira1, Leonardo V Andreato2
1Strength Training Study and Research Group, Institute of Health Sciences, Paulista University, São Paulo, Brazil.
Journal of Strength and Conditioning Research
|July 7, 2026
Summary
Beta-alanine supplementation significantly boosts strength endurance in resistance-trained individuals during intense drop-set and bi-set workouts. This improvement in performance occurred without negatively impacting psychological responses like perceived exertion or motivation.
Area of Science:
- Exercise Physiology
- Sports Nutrition
- Human Performance
Background:
- Beta-alanine (BA) is known for ergogenic effects, but its impact on resistance exercise performance is not fully understood.
- Advanced resistance training techniques like drop-sets and bi-sets may induce greater physiological stress, potentially enhancing BA's benefits.
Purpose of the Study:
- To investigate if beta-alanine supplementation improves isotonic strength endurance performance during drop-set and bi-set resistance exercises.
- To assess the effects of beta-alanine supplementation on psychological responses, including perceived exertion, motivation, and affect, during these advanced protocols.
Main Methods:
- A 4-week double-blind, parallel-group study involving 22 resistance-trained individuals.
- Participants were randomized to receive either beta-alanine (6.4 g·day-1) or a placebo (maltodextrin).
- Strength endurance was measured by the total number of repetitions performed during drop-set and bi-set protocols before and after supplementation.
Main Results:
- Beta-alanine supplementation significantly increased total repetitions in both drop-set (+17.3%) and bi-set (+18.2%) protocols compared to placebo.
- No significant differences in perceived exertion, motivation, or affect were observed between the beta-alanine and placebo groups.
- Perceived exertion increased across sets in both protocols, but this was not influenced by supplementation.
Conclusions:
- Four weeks of beta-alanine supplementation effectively enhances isotonic strength endurance performance in resistance-trained individuals using drop-set and bi-set protocols.
- Beta-alanine supplementation does not alter psychological responses during these intense resistance exercise protocols.
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