Objective: This study focused on the effect of γ-aminobutyric acid (GABA) intake on psychological state and game performance during esports gameplay. Methods: A randomized, double-blind, placebo-controlled crossover study was conducted with eight healthy male university students aged 20–24 years who regularly play esports. The participants ingested either 200 mg of GABA or a placebo prior to gameplay and then completed a standardized esports task using the Mobalytics Proving Ground™ (MPG), a perceptual-cognitive task within “League of Legends” designed to train and evaluate player performance. Subjective psychological states were assessed pre- and post-gameplay using the Profile of Mood States 2 (POMS2^®) short version. Esports task performance was evaluated based on MPG scores. Results: GABA intake significantly reduced psychological confusion–bewilderment and fatigue in the POMS 2^® short version during esports gameplay. Furthermore, the game scores were significantly higher in the GABA group compared to the placebo group. Conclusions: These findings suggest that GABA intake may serve as a potential strategy to enhance both the mental state and performance of esports players.

本研究の目的は，複数対象追跡（Multiple Object Tracking，以下MOT）スキルのトレーニング効果の検討に加え，介入前後の視覚探索方略の変化を明らかにすることであった．実験参加者は男性の大学野球競技者29名で，トレーニング群（T群）19名とコントロール群（C群）10名に群分けした．介入内容はMOT課題であり，介入期間は3週間であった．介入の結果，群と介入前後の間で有意な交互作用が認められ，T群は介入前より介入後に有意にMOT課題の成績が向上していた．次に，トレーニング効果大群（LTE群）6名とトレーニング効果小群（STE群）6名の視覚探索方略の変化を検討した．その結果，介入後のLTE群の視線の移動距離は短く，停留点の移動速度は大きい傾向で，効果量は中程度と解釈できたが，有意差は認められなかった．以上の結果から，大学生野球競技者のMOTスキルはトレーニング可能であることが示された．また，MOTスキルのトレーニングによる視覚探索方略の明確な変化は明らかにできなかった．