Fig. 5From: Effect of food sources of nitrate, polyphenols, L-arginine and L-citrulline on endurance exercise performance: a systematic review and meta-analysis of randomised controlled trialsL-citrulline supplementation forest plot. Abbreviations – n, sample size; SMD, standardised mean difference (Hedge’s g); CI, confidence interval; GXT, graded exercise test; IGXT, TT, time-trial; TTE, time to exhaustion; Qb, between-group Q-statistic.Back to article page