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<p>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&#xa0;mL of beetroot juice, concentrated NO<sub>3</sub><sup>−</sup>-rich beverage (BJ, 6.4&#xa0;mmol NO<sub>3</sub><sup>−</sup>) or PLA (~ 0.04&#xa0;mmol NO<sub>3</sub><sup>−</sup>) 180&#xa0;min and caffeine or placebo (3&#xa0;mg/kg) 60&#xa0;min before the trial. Muscular strength/power was evaluated at 25%, 50%, 75%, 90% and 100%1RM and muscular endurance at 65%1RM, in bench press (BP) and back squat (BS). In all tests, mean (V<sub>mean</sub> and W<sub>mean</sub>) and peak (V<sub>peak</sub> and W<sub>peak</sub>) velocity and power output were measured. In BS, muscular strength/power showed a supplement-by-load effect in V<sub>mean</sub> and W<sub>mean</sub> (P &lt; 0.05, η<sub>p</sub><sup>2</sup> = 0.167–0.173), with caffeine increased compared to placebo at 75%, 90% and 100%1RM (9–25%, P &lt; 0.005, g = 0.51–1.47); while in muscular endurance, significant differences were found in number of repetitions, V<sub>mean</sub> and W<sub>mean</sub> (P &lt; 0.05, η<sub>p</sub><sup>2</sup> &gt; 0.277), in all experimental groups (CAF, BJ and CAF + BJ) compared to placebo (6–17%, P &lt; 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.</p>

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Single and combined effect of beetroot juice and caffeine intake on muscular strength, power and endurance performance in resistance-trained males

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月14日

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  • Juan Jesús Montalvo-Alonso,
  • Marta del Val-Manzano,
  • Carmen Ferragut,
  • David Valadés,
  • Álvaro López-Samanes,
  • Raúl Domínguez,
  • Alberto Pérez-López

摘要

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 NO3−-rich beverage (BJ, 6.4 mmol NO3−) or PLA (~ 0.04 mmol NO3−) 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 muscular endurance at 65%1RM, in bench press (BP) and back squat (BS). In all tests, mean (Vmean and Wmean) and peak (Vpeak and Wpeak) velocity and power output were measured. In BS, muscular strength/power showed a supplement-by-load effect in Vmean and Wmean (P < 0.05, ηp2 = 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, Vmean and Wmean (P < 0.05, ηp2 > 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.