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However training assists to improve the endurance capacity of the fast twitch fibres with systematic endurance training． Also certain enzymes found in the muscles determine the ability of the muscles to work aerobically whereas others regulate the use of fats． These are called endurance enzymes and the level found in the muscles of a well trained footballer is higher than an untrained player． Also we can find a large number of capillaries supplying the muscles of these players．To maintain a high level of these enzymes the footballer has to maintain his level of fitness as inactivity will lower its content．
然而通过系统的耐力训练有助于提高快肌纤维的有氧耐力水平，肌肉里的某些酶决定肌肉有氧运动的能力，而另一些酶则调节脂肪的利用。这些决定肌肉有氧运动能力的酶被称为耐力酶，经过良好耐力训练的足球运动员其耐力酶的含量高于未经训练的运动员。除此之外，我们还可发现在足球运动员的肌肉内富含数量众多的毛细血管为其肌肉提供养料。所以为使自己体内的耐力酶保持在一种高水平，足球运动员必须保持自己的体能状态以防因为缺乏训练而降低耐力酶的含量。