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首页> 外文期刊>International Journal of Exercise Science >Effects of Single-Dose Dietary Nitrate on Oxygen Consumption During and After Maximal and Submaximal Exercise in Healthy Humans
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Effects of Single-Dose Dietary Nitrate on Oxygen Consumption During and After Maximal and Submaximal Exercise in Healthy Humans

机译：单剂量饮食硝酸盐对健康人最大和次最大运动期间及之后氧消耗的影响

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International Journal of Exercise Science 11(3): 214-225, 2018. Dietary nitrate (NO3-) has been shown to reduce oxygen consumption (VO2) during moderate to high-intensity (e.g. time to fatigue, time trials) exercise and often in trained athletes. However, less is known regarding prolonged exercise and the potential impact of NO3- on post-exercise excess oxygen consumption (EPOC), particularly in untrained individuals, who may have different metabolic goals during exercise than trained individuals. We tested the hypothesis that acute nitrate supplementation in the form of beet root juice will significantly decrease both VO2 during maximal exercise and EPOC in both maximal and submaximal exercise trials. Eight young, moderately active, healthy males (age: 24.8±1.4 years, body mass index: 23.7±0.4 kg/m2; VO2max: 34.2±3.9 ml/kg/min) performed step-wise maximal cycle exercise (n=4) and prolonged submaximal cycle exercise (n=6) (45 min; 38±2% of max work rate) in control (anti-bacterial mouthwash) and acute NO3– supplemented conditions [70ml concentrated beet root juice (0.4g NO3-), 2 hrs prior to exercise] on separate occasions. Measurements of VO2 (indirect calorimetry), arterial blood pressure (MAP; sphygmomanometry), and heart rate (HR; ECG) were made before, during, and following exercise bouts. NO3- reduced MAP at rest ~1-3mmHg. However, NO3- had no impact on VO2 during maximal (VO2max, Ctrl: 34.2±3.9 ml/kg/min vs NO3-: 31.7±4.4 ml/kg/min), submaximal exercise (average of min 25-45, Ctrl: 24.6±2.4 ml/kg/min vs NO3-: 26.8±3.3 ml/kg/min) or EPOC (area under the curve, Ctrl: 0.57±0.24 L vs NO3-: 0.66±0.16 L). Thus, while NO3- supplementation may have performance benefits in elite athletes exercising at high intensities, in recreationally active males, there appears to be little impact on changes in VO2 due to maximal or submaximal prolonged exercise.
机译：国际运动科学杂志11（3）：214-225，2018.在中度到高强度（例如疲劳时间，时间试验）运动以及经常运动的过程中，饮食中的硝酸盐（NO3-）可以减少氧气消耗（VO2）。在训练有素的运动员中。但是，关于长时间运动以及NO3-对运动后过量氧气消耗（EPOC）的潜在影响知之甚少，特别是在未经训练的个体中，他们在运动过程中的代谢目标可能与训练有素的个体不同。我们测试了以下假设：在最大运动和次最大运动试验中，甜菜根汁形式的急性硝酸盐补充会显着降低最大运动期间的VO2和EPOC。八名年轻，中等活跃，健康的男性（年龄：24.8±1.4岁，体重指数：23.7±0.4 kg / m2;最大摄氧量：34.2±3.9 ml / kg / min）进行了逐步最大循环运动（n = 4）以及在对照组（抗菌漱口水）和急性NO3补充条件下（70ml甜菜根浓缩汁（0.4g NO3-），在延长的次最大循环运动中（n = 6）（45分钟;最大工作率的38±2％），运动前2小时]。在运动前，运动中和运动后测量VO2（间接量热法），动脉血压（MAP;血压计）和心率（HR; ECG）。在静止状态下，NO3-降低MAP约1-3mmHg。但是，NO3-在最大运动量（VO2max，Ctrl：34.2±3.9 ml / kg / min vs NO3-：31.7±4.4 ml / kg / min），次最大运动（平均25-45分钟，Ctrl： 24.6±2.4 ml / kg / min相对于NO3-：26.8±3.3 ml / kg / min）或EPOC（曲线下面积，Ctrl：0.57±0.24 L vs NO3-：0.66±0.16 L）。因此，虽然NO3补充剂对高强度运动的精英运动员可能具有性能上的好处，但在娱乐活跃的男性中，由于最大程度或次最大程度的长时间运动对VO2的变化影响很小。

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