Effects of Caffeine, L-Theanine, and Diaphragmatic Breathing on Esports Players' Performance

This study explores the effects of caffeine, L-theanine supplementation, and diaphragmatic breathing exercises on esports players' game performance, focusing on reaction time and accuracy. Caffeine is widely recognized for its stimulating effects, improving attention and reducing fatigue, while L-theanine, found in tea, is known to reduce stress and balance the effects of caffeine. Diaphragmatic breathing exercises are designed to lower stress levels, improve focus, and enhance cognitive function.

The study utilizes a randomized, single-blind crossover design, where participants-esports players aged 18-30-will undergo three different interventions: caffeine only, caffeine combined with L-theanine, and caffeine combined with diaphragmatic breathing exercises. Performance outcomes, including reaction time and accuracy, will be assessed using game-based software and tests. Participants will have their performance measured before and after each intervention, allowing for comparison between the different strategies.

This study aims to determine whether these supplements and exercises, alone or in combination, can serve as effective ergogenic aids, helping esports players optimize their performance by improving cognitive and motor skills, while also reducing stress. These findings could have broader applications for enhancing mental performance in competitive environments.

Inclusion criteria

• Male esports players aged 18-30.
• Actively involved in esports for at least 6 hours per week for a minimum of 6 months.
• Low caffeine consumption (less than 80 mg per day).
• Low L-theanine consumption (less than 100 mg per day).
• Non-smokers or those who do not use tobacco products.
• No recent history of upper extremity surgery.
• No known allergies to caffeine or L-theanine.
• No neurological, visual, or auditory disorders.
• No use of drugs or performance-enhancing supplements within the past month.
• No alcohol consumption within the past week.

Exclusion criteria

• Use of stimulant medications.
• History of upper extremity surgery.
• Diagnosed neurological, visual, or auditory disorders.
• Allergy to caffeine or L-theanine.
• Use of drugs or performance-enhancing supplements within the past month.
• Regular tobacco use.
• Consumption of alcohol in the past week.
• Inconsistent sleep patterns or difficulty following standardized sleep and hydration guidelines.