Paul Turner said:Rich Clark said:My point is that if you don't know your true MHR, you don't know what the
"danger areas" are. Your MHR could be 175 and it could be 210. So that
reading of 170 could have been pushing things or it could have been just
north of cruising speed for your heart. So if you haven't established your
MHR, either through medically-supervised testing or empirically, your HRM
isn't telling you anything useful.
(I don't dwell on this any more, but I'm pointing this out as a highly
medicated person with a damaged heart; I take a great deal of interest in
my MHR and how close I come to it when I ride. Since I know my MHR fairly
precisely, my HRM frees me from worrying about it and I can ride long and
far without concern. But I do have nice low gears for hills.)
Rich, I'm curious if a person with an undamaged heart needs to worry about
MHR from a safety standpoint at all. I believe someone with an old
infarction or other kinds of damage may be at risk for arrhythmias at close
to MHR, but is that true for people with healthy hearts? Or can most of us
(including Preston) just assume that hitting MHR is no danger and only worry
about it if we are trying to work at within a particular range based on MHR?
--
Paul Turner
I can only speak for people with healthy hearts but here is my take,
if anyone cares. At 56 (age is relevant here) I can max at over 180
and sustain 170 for a fairly long time. The only problem I have is
when I drink too much coffee before riding, and the caffeine causes
my heart to skip a beat about once per minute. No coffee and the
problem goes away. When I hit MHR or very near to it I can take my
pulse just looking at my watch and feeling the thumps as my heart
beats. No pain, just big thumps, and I can feel the skipped beats.
Now, if you feel pain of any kind at this point, or noticeable beat
skipping it is time to go to your doctor ASAP. Any pain could be a
sign that you are at your hearts limit and it is a warning, and it
could be Angina, another warning signal. If you have more than one
skipped beat per minute, especially without caffeine it is doctor
time.
Caution is the word, unless you have a big life insurance
policy and don't mind going out doing something you enjoy.
I say that in semi-seriousness for the married folks, since
I am married and like to stress my heart to the max sometimes.
If I go out in a blaze of pedaling glory, at least my family is
covered. Doctor first, then ride as hard as you want.
I may be just putting out a false memory here, but I do seem to
remember some research about people who have had mild to moderate
heart attacks building their hearts up to full health again by
an exercise program. You would have to check with the AMA or your
doctor (if he is a good one, some aren't) and see what the regimen
would be. I think it goes like raise you heart rate about 20% over
resting state by walking or something, about 1 hour per day for
a month, then as your heart builds up capacity you can up the
exercise level. Good eating habits must go with the exercise, but
you can do it.
The AMA is the authority, not me, so go forth and look. There is
also some interesting research going on in other countries that
you may be able to access with the internet. The USA is not the
only country doing medical research these days.
Healthy biking,
Bill Baka