According to one formula, your maximum heart rate (in beats per minute) is 220 minus your age (in years). A) How much does your maximum heart rate change from age 35 to 50? B) What is your maximum heart rate at age 65?

Question

According to one formula, your maximum heart rate (in beats per minute) is 220 minus your age (in years).  A) How much does your maximum heart rate change from age 35 to 50?  B)  What is your maximum heart rate at age 65?

anonymous · Answer

Where are you facing problems?

anonymous · Answer

Question A

anonymous · Answer

Let the age be X, then the equation is 220-X
Now put X as 35 and then 50, what are your answers?

anonymous · Answer

185 and 170?

anonymous · Answer

so 15 beats?

anonymous · Answer

Yes! When your grow old, the no. of beats deacrease by 15.

anonymous · Answer

Would you argue that this is a valid model?

anonymous · Answer

Well it depends on how healthy one is, see this http://www.livestrong.com/article/168986-why-does-the-heart-rate-decrease/

anonymous · Answer

There are more chances getting ill with age, so yes i'd argue its valid.

anonymous · Answer

Thanks for all your help!