Department of Health Professions, Manchester Metropolitan University, Manchester M15 6GX, UK.
Institute of Sport, Manchester Metropolitan University, Manchester M155TN, UK.
Nutrients. 2022 Jul 11;14(14):2839. doi: 10.3390/nu14142839.
Nitrate (NO3−) supplementation has been reported to enhance intermittent exercise performance; however, its impact on oxygen (O2) cost during intermittent running exercise is unclear. The aim of this study was to assess if acute NO3− supplementation would elicit performance benefits in recreationally active individuals during the Yo−Yo intermittent recovery level 1 (Yo-Yo IR1) test, with its potential benefit on O2 consumption (VO2), in a double-blind, randomized, crossover study, 12 recreational males consumed NO3−-rich (NIT; ~12.8 mmol), and NO3−-depleted (PLA; 0.04 mmol) concentrated beetroot juice 3 h before completing the Yo-Yo IR1 test. VO2 was measured at 160, 280 and 440 m (sub-maximal) and when the test was terminated (peak). Performance in the Yo−Yo IR1 was greater with NIT (990 ± 442.25 m) compared to PLA (870 ± 357.4 m, p = 0.007). The VO2 was not significantly different at 160 m (1.92 ± 0.99 vs. 2.1 ± 0.88 L·min−1), 280 m (2.62 ± 0.94 vs. 2.83 ± 0.94 L·min−1), 440 m (3.26 ± 1.04 vs. 3.46 ± 0.98 L·min−1) and peak (4.71 ± 1.01 vs. 4.92 ± 1.17 L·min−1) between NIT and PLA trials (all p > 0.05). The present study has indicated that acute supplementation of NO3− enhanced intermittent running performance but had no effect on VO2 during the Yo−Yo IR1 test in recreational young adults.
硝酸盐（NO3−）补充已被报道可提高间歇性运动表现；然而，其对间歇性跑步运动中氧气（O2）消耗的影响尚不清楚。本研究旨在评估在一项双盲、随机、交叉研究中，急性 NO3−补充是否会在 Yo-Yo 间歇恢复水平 1（Yo-Yo IR1）测试中为有运动习惯的个体带来表现上的益处，以及其对 O2 消耗（VO2）的潜在益处。12 名有运动习惯的男性在完成 Yo-Yo IR1 测试前 3 小时分别饮用富含硝酸盐（NIT；~12.8mmol）和不含硝酸盐（PLA；0.04mmol）的浓缩甜菜根汁。在 160、280 和 440 米（亚最大）和测试结束时（峰值）测量 VO2。与 PLA（870 ± 357.4 m）相比，NIT（990 ± 442.25 m）在 Yo-Yo IR1 中的表现更好（p = 0.007）。在 160 米（1.92 ± 0.99 与 2.1 ± 0.88 L·min−1）、280 米（2.62 ± 0.94 与 2.83 ± 0.94 L·min−1）、440 米（3.26 ± 1.04 与 3.46 ± 0.98 L·min−1）和峰值（4.71 ± 1.01 与 4.92 ± 1.17 L·min−1）时，NIT 和 PLA 试验之间的 VO2 没有显著差异（p > 0.05）。本研究表明，急性补充硝酸盐可提高间歇性跑步的表现，但对年轻有运动习惯的个体在 Yo-Yo IR1 测试中的 VO2 没有影响。
