The Effect Of Caffeine On Multiple Objects Tracking Performance Of Football Players After HIIT

Caffeine(1,3,7-trimethylxanthine)is among the supplements most commonly used by athletes of all sports modalities.Since 2004 when caffeine was removed from the list of banned substances for sports,caffeine supplementation has reached prevalence rates of 76%among international competition athletes.So far more and more research has confirmed that caffeine has a positive impact on physical fitness,cognition,and mood state,and also improve cognitive performance after ingesting caffein and acute HIIT.However,not involved how acute caffeine or/and acute HIIT affect multiple objects tracking.The purpose of the study is to examine the impact of acute caffeine or/or acute HIIT on football players’ multiple objects tracking performance.Both experiments 1 and 2 used a random,placebo-control,and double-blind crossdesign.Experiment 1 used a mixed design of 2(supplements:caffeine,placebo)× 2(interval:30 minutes,60 minutes)× 2(pre-post test:pre,post),by controlling the supplements and interval to investigate the effect of 200 mg caffeine on multiple objects tracking,alertness and energy.It was found that acute caffeine had no significant effect on multiple objects tracking performance;multiple objects tracking performance and energy measures after 60 minutes of caffeine intake were significantly higher than 30 minutes.Since the caffeine effect is desirable after 60 minutes,experiment used a mixed design of 2(supplements:caffeine,placebo,control)× 2(pre-post test:pre,post)to measure the the effect of acute caffeine combined with HIIT(60 minutes after ingestion of caffeine)on multiple objects tracking,alertness,and energy.It was observed that acute caffeine along with HIIT had no significant impact on multiple objects tracking,alertness,and energy.Further exploratory studies have suggested that acute HIIT does not affect multiple objects tracking performance,but reduces alertness and energy.Conclusion:Acute caffeine or(and)acute HIIT does not affect the multiple objects tracking performance.Acute HIIT may reduce the subjective feelings of alertness and energy.