Fig. 4From: In-vitro examination of the positive inotropic effect of caffeine and taurine, the two most frequent active ingredients of energy drinksRelative durations of contraction (CD) of all trails on a logarithmic scale. Group 2 and 3 showed significant albeit small decreases (95 ± 1.6% and 92 ± 1.4% with p-value <0.01 for both) while group 1 showed no change at allBack to article page