Tan Rachel, Price Katherine M, Wideen Lauren E, Lincoln Isabella G, Karl Sean T, Seals Jacob P, Paniagua Keonabelle K, Hagen Dylan W, Tchaprazian Isaac, Bailey Stephen J, Pennell Adam
Department of Sports Medicine, Pepperdine University, Malibu, CA, United States.
School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom.
Front Nutr. 2023 Jul 6;10:1217192. doi: 10.3389/fnut.2023.1217192. eCollection 2023.
This study tested the hypothesis that co-ingesting nitrate (NO)-rich beetroot juice (BR) and pomegranate powder (POM) would enhance neuromuscular performance during vertical countermovement jumps, explosive kneeling countermovement push-ups, and back squats compared to BR ingestion alone. Fifteen recreationally-active males were assigned in a double-blind, randomized, crossover design, to supplement in 3 conditions: (1) NO-depleted beetroot juice (PL; 0.10 mmol NO) with two empty gelatin capsules; (2) NO-rich beetroot juice (BR; 11.8 mmol NO) with two empty gelatin capsules, and (3) BR with 1,000 mg of POM powder in two capsules (BR + POM). Participants completed 5 countermovement jumps and 5 kneeling countermovement push-ups interspersed by 1 min of recovery. Subsequently, participants performed 2 sets of 2 × 70% one-repetition maximum back squats, interspersed by 2 min of recovery. Plasma [NO] and nitrite ([NO]) were elevated following BR and BR + POM compared with PL and POM ( < 0.001) with no differences between BR and BR + POM ( > 0.05) or PL and POM ( > 0.05). Peak power during countermovement jumps increased by 3% following BR compared to BR + POM (88.50 ± 11.46 vs. 85.80 ± 10.14 W/Kg, = 0.009) but not PL (88.50 ± 11.46 vs. 85.58 ± 10.05 W/Kg, = 0.07). Neuromuscular performance was not different between conditions during explosive kneeling push-ups and back squats ( > 0.05). These data provide insight into the efficacy of NO to modulate explosive resistance exercise performance and indicate that supplementing with BR alone or combined with POM has limited ergogenic potential on resistance exercise. Furthermore, caution is required when combining BR with POM, as this could compromise aspects of resistance exercise performance, at least when compared to BR ingested independently.
与单独摄入富含硝酸盐（NO）的甜菜根汁（BR）相比，同时摄入富含NO的甜菜根汁和石榴粉（POM），在垂直纵跳、爆发性跪姿反向俯卧撑和后深蹲过程中，能增强神经肌肉表现。15名有运动习惯的男性被分配到一个双盲、随机、交叉设计中，在三种条件下进行补充：（1）不含NO的甜菜根汁（PL；0.10 mmol NO）加两个空明胶胶囊；（2）富含NO的甜菜根汁（BR；11.8 mmol NO）加两个空明胶胶囊；（3）BR加两个胶囊中的1000 mg POM粉（BR + POM）。参与者完成5次反向俯卧撑和5次跪姿反向俯卧撑，中间穿插1分钟恢复时间。随后，参与者进行2组2×70% 1次最大重复量的后深蹲，中间穿插2分钟恢复时间。与PL和POM相比，BR和BR + POM后血浆[NO]和亚硝酸盐（[NO]）升高（<0.001），BR和BR + POM之间（>0.05）或PL和POM之间（>0.05）无差异。与BR + POM相比，BR后反向俯卧撑的峰值功率增加了3%（88.50±11.46 vs. 85.80±10.14 W/Kg，=0.009），但与PL相比无增加（88.50±11.46 vs. 85.58±10.05 W/Kg，=0.07）。在爆发性跪姿俯卧撑和后深蹲过程中，各条件之间的神经肌肉表现无差异（>0.05）。这些数据为NO调节爆发性抗阻运动表现的功效提供了见解，并表明单独补充BR或与POM联合补充对抗阻运动的促力潜能有限。此外，将BR与POM联合使用时需要谨慎，因为这可能会损害抗阻运动表现的某些方面，至少与单独摄入BR相比是这样。
