Fig. 4From: Oral L-citrulline supplementation enhances cycling time trial performance in healthy trained men: Double-blind randomized placebo-controlled 2-way crossover studyPO profile during the 4 km TT (a) and mean PO (b) of the 4 km TT after placebo or L-citrulline supplementation. Values are means ± S.E.M. n = 22. * p < 0.05, indicating a significant difference from placeboBack to article page