Abstract
A systematic evaluation of current evidence was conducted to clarify the potential of training status to influence the exercise performance enhancing (ergogenic) effect of dietary inorganic nitrate supplementation. Studies were located via PubMed, ProQuest and SPORTDiscus electronic databases reported according to the guidelines outlined in the statement of Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA). Thirty-four studies met the inclusion criteria (70 trials). Random-effects meta-analyses was conducted, and meta-regressions were performed in a model with a priori potential moderator variables. Subgroup analysis revealed that NO3– supplementation was ergogenic in the lowest fitness category (i.e. \( \dot{V}\text{o}_{{2{ \hbox{max} }}} \) < 55.0 ml·kg−1·min−1) [standardized mean difference (SMD) = 0.17 (95% CI: 0.07 to 0.27, p = 0.001], but elicited no significant effect in the upper realms of fitness category (\( \dot{V}\text{o}_{{2{ \hbox{max} }}} \) > 55.0 ml·kg−1·min−1) p > 0.05). Meta-regression revealed that baseline \( \dot{V}\text{o}_{{2{ \hbox{max} }}} \) and supplementation duration was negatively (R2 = −0.11, 95% CI: −0.02 to −0.00, p = 0.035) and positively (R2 = 0.40, 95% CI: 0.00 to 0.05, p = 0.047) associated with the mean performance change between NO3– and control condition, respectively. The current analysis indicates that NO3– supplementation can enhance exercise performance with an ergogenic effect more likely in untrained subjects and as the duration of supplementation increases.
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This research was funded by Fundamental Research Grant Scheme (FRGS/1/2018/-WAB13/UITM/03/1), Ministry of Higher Education, Malaysia. All authors read and approved the final manuscript.
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Linoby, A. et al. (2020). The Role of Fitness Status in the Performance-Enhancing Effects of Dietary Inorganic Nitrate Supplementation: Meta-analysis and Meta-regression Analysis. In: Hassan, M., et al. Enhancing Health and Sports Performance by Design. MoHE 2019. Lecture Notes in Bioengineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-3270-2_44
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