Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 10, 1000 Ljubljana, Slovenia.
Department of Nephrology, University Medical Centre Ljubljana, Zaloška 7, 1000 Ljubljana, Slovenia.
Nutrients. 2023 Aug 25;15(17):3721. doi: 10.3390/nu15173721.
Nitrates are an effective ergogenic supplement; however, the effects of nitrate supplements based on habitual dietary nitrate intake through diet alone are not well understood. We aimed to assess this in a group of 15 highly trained football players from Slovenian football's First Division. Participants underwent two separate Cooper performance tests either with nitrate supplementation (400 mg nitrates) or placebo while having their nutrition assessed for nitrate intake, as well as energy and macronutrient intake. Nitrate supplementation had a statistically significant positive effect on performance if baseline dietary nitrate intake was below 300 mg ( = 0.0104) in both the placebo and intervention groups. No effects of nitrate supplementation when baseline dietary nitrate intake was higher than 300 mg in the placebo group could be concluded due to the small sample size. Nitrate supplementation did not have a significant effect on perceived exertion. The daily nitrate intake of the participants was measured at 165 mg, with the majority of nitrates coming from nitrate-rich vegetables.
硝酸盐是一种有效的运动补剂；然而，通过饮食单独摄入习惯性膳食硝酸盐来补充硝酸盐的效果尚不清楚。我们旨在评估来自斯洛文尼亚足球甲级联赛的 15 名高水平足球运动员的这一情况。参与者在进行两次单独的库珀表现测试时，分别接受硝酸盐补充剂（400 毫克硝酸盐）或安慰剂，同时评估他们的营养状况，包括硝酸盐摄入量以及能量和宏量营养素摄入量。如果安慰剂和干预组的基础饮食硝酸盐摄入量低于 300 毫克（= 0.0104），硝酸盐补充剂对表现有统计学上的显著积极影响。由于样本量小，无法得出当安慰剂组的基础饮食硝酸盐摄入量高于 300 毫克时，硝酸盐补充剂没有效果的结论。硝酸盐补充剂对感知用力没有显著影响。参与者的每日硝酸盐摄入量为 165 毫克，其中大部分硝酸盐来自富含硝酸盐的蔬菜。
