THE EFFECTS OF ACUTE CAFFEINE CONSUMPTION ON JUMP SQUAT PEAK
Cardiff Metropolitan University
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The purpose of this study was to investigate the effects of acute caffeine consumption on jump squat peak power output. Eight resistance-trained university sports students (n=8 21.4 ± 1.2 years, 87.1 ± 9.8 kg and 179.3 ± 4.4cm) participated in the study, where they completed two testing sessions; a placebo beverage trial and a caffeine beverage trial, separated by one weeks rest. The study employed a double blind cross-over protocol so participants were unaware of the order of supplement consumption prior to testing. The caffeine trial involved a 3 mg∙kg-1 body mass (BM) dose of caffeine being administered 30 min prior to one of the testing sessions where anaerobic performance was measured. The placebo trial followed the same testing procedure with a placebo beverage consumed prior to testing rather than a caffeine beverage. Seven sets of one unloaded barbell jump squats were completed in each testing session; each set was performed with maximal effort with power output of each set recorded, with 5 mins of rest in between each set. Caffeine was found to significantly increase total work completed in each testing session for participants (caffeine = 15533W ± 2165.4 Watts vs. placebo = 15033 ± 2119.1 Watts, P<0.05) furthermore, caffeine also significantly increased the mean power output of participants in each testing session (caffeine = 2219 ± 309.3 Watts vs. placebo 2147.6 ± 302.7 Watts, P<0.05). However, caffeine was found to not significantly increase peak power output in the jump squat exercise over seven sets (caffeine = 2336.3 ± 305.6 Watts vs. placebo = 2256.5 ± 374.9 Watts P>0.05). A caffeine dose of 3 mg∙kg-1 body mass (BM) significantly increased anaerobic performance during seven sets of jumps squats, more work was completed and mean power output during each set was increased, however caffeine had no significant effect on peak power output values.
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