Fig. 2From: Effects of caffeine supplementation on anaerobic power and muscle activity in youth athletesMean and standard deviations of the normalized mean power frequency during six Wingate splits for all participants according to the test condition (CAF and PL). RF, rectus femoris; VL, vastus lateralis; VM, vastus medialis; BF, biceps femoris; GS, Gastrocnemius; CAF, caffeine; PL, placebo; s, secondBack to article page