Restricted accessResearch articleFirst published online 2026
Polyphenol-rich jaboticaba berry (Myrciaria jaboticaba) juice attenuates exercise–induced muscle fatigue development during resistance exercise in trained individuals
Jaboticaba berries have demonstrated high antioxidant activity with potential health benefits. However, their functional properties have not been specifically investigated in relation to exercise performance in trained individuals.
Purpose
This study aimed to examine the effect of jaboticaba berry juice (JBJ) intake on resistance exercise–induced muscle fatigue.
Methods
Twenty trained participants consumed 250 mL of jaboticaba berry juice (JBJ; 1300 mg total polyphenols) or a fruit-flavored placebo (PLA) for three days before and on the day of testing. They performed 6 × 10 maximal voluntary isokinetic contractions (MVIC) of the elbow flexors and 15 × 10 of the knee extensors. MVIC, as an indicator of muscle fatigue development, and total work (TW) were evaluated during the resistance exercise protocol.
Results
Exercise significantly reduced MVIC (p < 0.001) in both upper and lower limbs. JBJ intake attenuated the reduction in MVIC, reflecting a mitigation of muscle fatigue development, in the elbow flexors (p = 0.049) and knee extensors (p = 0.047) only in males, and improved TW performance (p = 0.004) in JBJ compared with PLA.
Conclusion
Consumption of jaboticaba berry polyphenols attenuated resistance exercise–induced muscle fatigue development in trained males and improved total work.
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