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<p>Dietary nitrate (NO<sub>3</sub><sup>−</sup>) can enhance skeletal muscle contractile function and explosive-type exercise by modulating type II muscle fibers; however, limited attention has been directed at exploring the optimal dosing guidelines and potential performance-enhancing effects of NO<sub>3</sub><sup>−</sup> supplementation during resistance-type exercise. The purpose of our investigation was to examine potential dose–response effects of concentrated NO<sub>3</sub><sup>−</sup>-rich beetroot juice on neuromuscular performance during resistance exercise. Eighteen resistance-trained men were assigned in a double-blind, randomized, crossover design, to four conditions to consume beetroot juice containing: negligible NO<sub>3</sub><sup>−</sup> (PL); ~ 6&#xa0;mmol NO<sub>3</sub><sup>−</sup> (BR-LOW); ~ 12&#xa0;mmol NO<sub>3</sub><sup>−</sup> (BR-MOD); and ~ 24&#xa0;mmol NO<sub>3</sub><sup>−</sup> (BR-HIGH). Participants completed 1 set of vertical countermovement jumps (CMJ), 2 sets × 3 repetitions of barbell back squats, and 2 sets × 3 repetitions of barbell bench press 2.5&#xa0;h post-supplementation. Plasma [NO<sub>3</sub><sup>−</sup>] increased in a dose-dependent manner (<i>P</i> &lt; 0.01). Plasma [nitrite] ([NO<sub>2</sub><sup>−</sup>]) increased in all BR conditions compared to PL (<i>P</i> &lt; 0.05), such that BR-MOD vs. BR-LOW (<i>P</i> &lt; 0.01) and BR-LOW vs. PL (<i>P</i> &lt; 0.01), but BR-HIGH was not different compared to BR-MOD (<i>P</i> &gt; 0.05). Performance was not different between conditions in CMJ, 50% one-repetition maximum (1RM) and 75%1RM back squats, or 50%1RM and 75%1RM bench press (<i>P</i> &gt; 0.05). The change in plasma [NO<sub>2</sub><sup>−</sup>] was significantly correlated with peak power (<i>r</i> = −&#xa0;0.65, <i>P</i> = 0.003), mean power (<i>r</i> = −&#xa0;0.52, <i>P</i> = 0.03), and mean velocity (<i>r</i> = −&#xa0;0.48, <i>P</i> = 0.04) during 50%1RM back squats following BR-LOW vs. PL but not in other conditions (<i>P</i> &gt; 0.05). This study indicates that dietary NO<sub>3</sub><sup>−</sup> does not impact resistance exercise performance at any of the doses assessed in the current study.</p>

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The effect of dietary nitrate supplementation on resistance exercise performance: A dose–response investigation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月24日

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  • Rachel Tan,
  • Isabella G. Lincoln,
  • Keonabelle K. Paniagua,
  • Justin M. Foster,
  • Lauren E. Wideen,
  • Raymond T. Gerardo,
  • Nathan J. Ornelas,
  • Isaac Tchaprazian,
  • Jeffrey Li,
  • Michael Egiazarian,
  • Samantha N. Rowland,
  • Stephen J. Bailey,
  • Adam Pennell

摘要

Dietary nitrate (NO3−) can enhance skeletal muscle contractile function and explosive-type exercise by modulating type II muscle fibers; however, limited attention has been directed at exploring the optimal dosing guidelines and potential performance-enhancing effects of NO3− supplementation during resistance-type exercise. The purpose of our investigation was to examine potential dose–response effects of concentrated NO3−-rich beetroot juice on neuromuscular performance during resistance exercise. Eighteen resistance-trained men were assigned in a double-blind, randomized, crossover design, to four conditions to consume beetroot juice containing: negligible NO3− (PL); ~ 6 mmol NO3− (BR-LOW); ~ 12 mmol NO3− (BR-MOD); and ~ 24 mmol NO3− (BR-HIGH). Participants completed 1 set of vertical countermovement jumps (CMJ), 2 sets × 3 repetitions of barbell back squats, and 2 sets × 3 repetitions of barbell bench press 2.5 h post-supplementation. Plasma [NO3−] increased in a dose-dependent manner (P < 0.01). Plasma [nitrite] ([NO2−]) increased in all BR conditions compared to PL (P < 0.05), such that BR-MOD vs. BR-LOW (P < 0.01) and BR-LOW vs. PL (P < 0.01), but BR-HIGH was not different compared to BR-MOD (P > 0.05). Performance was not different between conditions in CMJ, 50% one-repetition maximum (1RM) and 75%1RM back squats, or 50%1RM and 75%1RM bench press (P > 0.05). The change in plasma [NO2−] was significantly correlated with peak power (r = − 0.65, P = 0.003), mean power (r = − 0.52, P = 0.03), and mean velocity (r = − 0.48, P = 0.04) during 50%1RM back squats following BR-LOW vs. PL but not in other conditions (P > 0.05). This study indicates that dietary NO3− does not impact resistance exercise performance at any of the doses assessed in the current study.