On Fri, 22 Sep 2023 08:38:32 -0700 (PDT), Lou Holtman
<
lou.h...@gmail.com> wrote:
Even a casual look on the Internet shows that the 220 - age is only an
approximation of safe maximum heart rate as actual maximum depends on
a number of factors such as age, heredity, health, strength and so on.
Runners talk about "the anaerobic threshold" which is the maximum that
the runner can sustain for a prolonged period.
Then too, distance runners and other sports that demand high effort
over a long period of time normally have a lower resting heart rate so
that has to be taken into consideration when talking about maximum
effort. If for example your rating heart range is in the high end of
the "normal heart rate" - 60 - 100 BPM, say 100 BPM then your 175 BPM
is an increase of 1.75%. If your resting heart rate in on the lower
end, say 60 BPM then your 175 BPM is an increase of 2.9% evidence of a
greater power output.
Top Marathon runners have a resting heart rate in the range of as low
as 33 BPM to a high of 49 BPM.
It is not quite as simple as just 220 - age (:-)
--
Cheers,
John B.