When you run at MAS, you reach your maximum heart rate.

当你在MAS下跑，你将达到图表中最大心率。

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For the first, subtract your age from 220 to find your maximum heart rate.

第一个公式是用220减去你的年龄从而得到你的最大心跳频率。

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Once you step over about 80 percent of your maximum heart rate, you're training for speed.

一旦你突破80%的最高心率，就进入了速度训练。

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Right around eight minutes I hit my maximum heart rate of 157 and the technician injected me with more nuclear dye.

FORBES: My Visit with a Cardiologist, and What You Should Know About Your Heart