2. Originally Posted by technics

$S=220-A$

Therefore: $S=220-50$

Finally: $S=170$

3. why 220 - 50?

4. Originally Posted by technics
why 220 - 50?
look at the dark grey box beneath the picture.

5. Originally Posted by technics

As the standard maximul heart rate +10% is 187 and the standard maximul heart rate -10% is 153, the standard maximul heart rate is:

(187+153)/2=170

RonL

6. Originally Posted by CaptainBlack
As the standard maximul heart rate +10% is 187 and the standard maximul heart rate -10% is 153, the standard maximul heart rate is:

(187+153)/2=120

RonL
So, 120 minus 10% is 153? For once it's not me who made the mistake

7. Originally Posted by Quick
So, 120 minus 10% is 153? For once it's not me who made the mistake
You were too QUICK replying I posted then checked, you replyed while I was doing the checking.

RonL

8. what does 220 represent?

9. It's just a number.

10. Originally Posted by technics
what does 220 represent?
It is part of the model of standard maximum heart rate as a function of age.

standard maximum heart rate = 220 - age

RonL