Fig. 1
From: Effects of caffeine supplementation on anaerobic power and muscle activity in youth athletes
Mean and standard deviations for the normalized root mean square (%) of RF, VL, VM, BF and GS during six Wingate splits for all participants according to test condition (CAF and PL). RF, rectus femoris; VL, vastus lateralis; VM, vastus medialis; BF, biceps femoris; GS, Gastrocnemius; CAF, caffeine; PL, placebo; s, second. * Indicates significant differences over time (p < 0.05).