The AHA's chart still USES the 220 minus age formula, but has a wider zone of 50 to 85 percent of your Max heart rate.

该协会的表中仍然沿用220减去年龄的算法，但是讲区间扩大到了最高心率的50%到85%。

youdao

Start with 180 minus your age (a) for the fat burning zone upper limit target heart rate (z).

用180减去您的年龄，得到脂肪燃烧区的上限值。

youdao