Acute supplementation with caffeine and beetroot juice increased performance by 6-17% in the back squat exercise compared to placebo.
Caffeine supplementation improved muscular strength and power at loads of 75%, 90%, and 100% of one-repetition maximum in the back squat.
Performance enhancements with caffeine ranged from 9-25% compared to placebo.
Single and combined use of caffeine and beetroot juice significantly increased the number of repetitions performed at 65% of one-repetition maximum in back squats.
No significant effects were observed in muscular strength, power, or endurance during bench press exercises.
Simplified
To examine the single and combined effect of acute beetroot juice and caffeine supplementation in muscular strength, power, and endurance performance. Thirteen resistance-trained males participated in a triple-blind, cross-over, randomized controlled-trial with four conditions: (a) caffeine (CAF); (b) beetroot juice (BJ); (c) caffeine and beetroot juice (CAF + BJ); (d) placebo (PLA). Participants ingested 70 mL of beetroot juice, concentrated NO-rich beverage (BJ, 6.4 mmol NO) or PLA (~ 0.04 mmol NO) 180 min and caffeine or placebo (3 mg/kg) 60 min before the trial. Muscular strength/power was evaluated at 25%, 50%, 75%, 90% and 100%1RM and at 65%1RM, in bench press (BP) and back squat (BS). In all tests, mean (Vand W) and peak (Vand W) velocity and power output were measured. In BS, muscular strength/power showed a supplement-by-load effect in Vand W(P < 0.05, η = 0.167-0.173), with caffeine increased compared to placebo at 75%, 90% and 100%1RM (9-25%, P < 0.005, g = 0.51-1.47); while in muscular endurance, significant differences were found in number of repetitions, Vand W(P < 0.05, η > 0.277), in all experimental groups (CAF, BJ and CAF + BJ) compared to placebo (6-17%, P < 0.05, g = 0.46-94). No differences in muscular strength/power or endurance were found in BP. Single and combined acute beetroot juice and caffeine intake increased muscular endurance performance at 65%1RM in back squat but not in bench press exercise. 3 3 3mean mean peak peak mean mean p mean mean p ---2 2
Key numbers
25%
Increase in Mean Velocity at 100% 1RM
Caffeine compared to placebo in back squat exercise.
17%
Increase in Repetitions at 65% 1RM
Caffeine and beetroot juice vs. placebo in back squat exercise.
3 mg/kg
Caffeine Dose
Dose administered before trials.
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