如果让你找到一个不喜欢健身的理由，你会想到什么?一项最新研究表明剧烈运动不仅会使你的肌肉疲劳，还会让你的眼睛疲劳。但是不要怕，咖啡能够让你的眼睛重新振作起来。

　　在剧烈运动过程中，我们的肌肉会随着能量消耗而变得疲劳，并会产生许多"垃圾"产物。肌肉的表现会受到"中枢性疲劳"现象的影响，在这种情况下，机体化学信号的失衡会阻碍中枢神经系统有效地指导肌肉运动。

　　但是中枢性疲劳是否也会影响直接参与锻炼之外的运动系统仍不清楚，比如眼部的运动。为了对这一问题进行解答，研究人员设计了一个实验，他们在三个小时的剧烈运动过程中给11名参与者引用一种碳水化合物饮用品，里面加入一定量的咖啡因(咖啡因能够刺激中枢神经系统)，或者不加咖啡因作为安慰剂。运动之后，科学家们检测了参与者们身上的眼部追踪相机，观察他们大脑对视觉系统的控制能力。研究人员发现运动会降低快速眼动的速度，幅度大约在8%，这阻碍了他们捕获视觉信息的能力。而咖啡因能够抵消这种阻碍作用，其中一些参与者的眼动速度甚至还出现了增加。

　　相关研究结果发表在国际学术期刊 Scientific Reports上。Science新闻对这项研究进行了报道，并且在文章最后这样写道：如果你刚跑完一场马拉松，最好还是找个人开车带你回家吧。

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　　doi:10.1038/srep26614

　　Fatigue related impairments in oculomotor control are prevented by caffeine

　　Charlotte J. W. Connell, Benjamin Thompson, Gustav Kuhn, Michael P. Claffey, Shelley Duncan & Nicholas Gant

　　Strenuous exercise can result in an inability of the central nervous system to drive skeletal muscle effectively, a phenomenon known as central fatigue. The impact of central fatigue on the oculomotor system is currently unexplored. Fatigue that originates in the central nervous system may be related to perturbations in the synthesis and metabolism of several neurotransmitters. In this study we examine central fatigue in the oculomotor system after prolonged exercise. The involvement of central neurotransmission was explored by administering caffeine during exercise. Within a double-blind, randomized, repeated measures, crossover design, 11 cyclists consumed a placebo or caffeine solution during 180?min of stationary cycling. Saccadic eye movements were measured using infra-red oculography. Exercise decreased saccade velocity by 8% (placebo trial). This effect was reversed by caffeine, whereby velocity was increased by 11% after exercise. A non-oculomotor perceptual task (global motion processing) was unaffected by exercise. The human oculomotor system is impaired by strenuous exercise of the locomotor system. Caffeine exerts a protective effect on oculomotor control, which could be related to up-regulated central neurotransmission. In addition, cortical processes supporting global motion perception appear to be robust to fatigue.