The purpose of this study was to assess the impact of short-term dietary nitrate supplementation, in the form of red spinach extract (RSE), on bench press performance, muscle oxygenation, and cognitive function in resistance-trained males. Ten resistance-trained males participated in this randomized, cross-over, placebo-controlled, double-blind investigation. Each participant completed 7 days of either RSE (2 g; 180 mg NO₃⁻) or a maltodextrin placebo (PL) in a counterbalanced fashion with a 14-day washout between treatments. During experimental visits, participants were provided their 8th and last dose of RSE or PL 40 min before completing 5 sets of the barbell bench press exercise to failure at 75% of a predetermined 1-repetition maximum with 2 min rest intervals. Mean and peak power were recorded via a linear transducer. Near-infrared spectroscopy (NIRS) was implemented to estimate muscle oxygenation, a Stroop Test was used to assess cognitive function, and subjective performance ratings were obtained in relation to the acute resistance exercise sessions. Data were analyzed via separate repeated measures analyses of variance. There were no time by group interactions for bench press repetitions (p = 0.549), peak power (p = 0.061), or mean power (p = 0.877) across the 5 sets of bench press. Additionally, no significant differences (p > 0.05) were observed for any measure of muscle oxygenation, Stroop performance, or subjective performance ratings. It appears that 7 days of RSE supplementation did not alter performance, muscle oxygenation, nor Stroop scores during or following the bench press exercise in resistance-trained males.

中文翻译：

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补充红菠菜提取物对耐力训练后男性卧推性能，肌肉氧合和认知功能的影响

这项研究的目的是评估短期饮食中补充硝酸盐（以红色菠菜提取物（RSE）的形式）对耐力训练的男性卧推性能，肌肉氧合和认知功能的影响。十名接受抗性训练的男性参加了这项随机，交叉，安慰剂对照的双盲研究。每个参与者完成7天任RSE（2克; 180毫克NO ₃ ^-）或麦芽糖糊精安慰剂（PL），以平衡方式服用，治疗之间间隔14天。在实验拜访期间，在完成5组杠铃卧推锻炼之前，在40分钟内为参与者提供了第8次和最后一次RSE或PL剂量，直至以预定的1次重复最大值的75％进行失败，并间隔2分钟。平均值和峰值功率通过线性传感器记录。实施了近红外光谱（NIRS）来评估肌肉氧合，使用Stroop测试评估认知功能，并获得了与急性抵抗力锻炼有关的主观表现等级。通过单独的重复方差分析对数据进行分析。没有时间进行卧推重复操作（p = 0.549），峰值功率（p = 0.549）p = 0.061）或5台卧推的平均功率（p = 0.877）。此外，对于任何形式的肌肉氧合，Stroop表现或主观表现评定，均未观察到显着差异（p > 0.05）。似乎在接受抗力训练的男性进行卧推锻炼期间或之后，补充RSE 7天并没有改变性能，肌肉氧合或Stroop评分。