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Subgroup analysis of NO3− supplementation parameters. SMD of NO3− supplementation compared with placebo for different daily concentrations of NO3− supplementation (A), different number of days of NO3− supplementation (B), and different timing of NO3− supplementation relative to commencement of exercise (C) calculated used random-effects meta-analyses. * denotes better performance after NO3− supplementation compared with placebo, P < 0.05.
