Effect of caffeinated gum on a battery of rugby-specific tests in trained university-standard male rugby union players

Figures & data

Fig. 1 A schematic diagram of the order of the testing battery and the timing of the supplement

Fig. 2 Countermovement jump height (n = 17). Data are expressed in mean ± SD. * Caffeine significantly higher than placebo (p = 0.044)

Fig. 3 (a) 6 × 30 m sprint times (n = 17). Data are expressed in mean ± SD. b Fatigue Index (n = 17). Data are expressed in mean ± SD. * Caffeine significantly lower than placebo (p = 0.001)

Fig. 4 Total distance covered on the Yo-Yo intermittent recovery test level 2 (n = 17). Data are expressed in as mean ± SD. * Caffeine significantly higher than placebo (p = 0.010)

Fig. 5 Individual responses to caffeine gum supplementation on the battery of tests (n = 17). expressed in percentage change from baseline. a - Countermovement Jump Test; b - Illinois Agility Test; c - Yo-Yo Test; d - Fatigue Index