Studies Centre in Applied Combat (CESCA), Toledo, Spain.
Applied Psychophysiological Research Group, European University of Madrid, Madrid, Spain.
J Med Syst. 2018 Mar 24;42(5):84. doi: 10.1007/s10916-018-0945-2.
Caffeine is one of the ergogenic substances most used by warfighters in current operation areas, but the effect on the organic response and operational performed is already poor knowledge. This research aimed to study the acute effect of 400 mg of caffeine monohydrate on the psycho-physiological response and rifle marksmanship of warfighters during a close quarter combat simulation. We analysed parameter of heart rate, blood lactate, cortical arousal, state anxiety and marksmanship of 20 Spanish Army veteran warfighters before and after a close quarter combat simulation in a double-blind procedure, also a correlation analysis was conducted between all the study variables. Marksmanship of warfighters did not improve with the caffeine ingestion, but it produced an increase in blood lactate concentration (caffeine: 1.9 ± 0.5 vs. 9.2 ± 1.1 mmol.l; placebo: 1.8 ± 0.7 vs. 6.9 ± 2.2 mmol.l), cortical arousal (% of change: caffeine: 2.51; placebo: -1.96) and heart rate (caffeine: 80.0 ± 7.2 vs. 172.9 ± 28.2 bpm; placebo: 79.3 ± 6.4 vs. 154.0 ± 26.8 bpm). In addition, higher heart rate values correlated negatively with marksmanship in close quarter combat. We concluded that caffeine intake did not improve the warfighters rifle marksmanship in close quarter combat possibly due to the increase in the physiological response.
咖啡因是当前作战区域内战士最常使用的增强物质之一，但关于其对有机反应和作战表现的影响知之甚少。本研究旨在研究 400mg 一水咖啡因对近距离战斗模拟中战士的心理生理反应和步枪射击精度的急性影响。我们以双盲程序分析了 20 名西班牙陆军退伍战士在近距离战斗模拟前后的心率、血乳酸、皮质唤醒、状态焦虑和射击精度等参数，并对所有研究变量进行了相关性分析。战士的射击精度并没有因咖啡因的摄入而提高，但它确实使血乳酸浓度升高（咖啡因：1.9±0.5 与 9.2±1.1mmol.l；安慰剂：1.8±0.7 与 6.9±2.2mmol.l）、皮质唤醒（%变化：咖啡因：2.51；安慰剂：-1.96）和心率（咖啡因：80.0±7.2 与 172.9±28.2bpm；安慰剂：79.3±6.4 与 154.0±26.8bpm）。此外，更高的心率值与近距离战斗中的射击精度呈负相关。我们得出结论，咖啡因的摄入并没有提高战士在近距离战斗中的步枪射击精度，这可能是由于生理反应的增加。
