"Ignoramus20931" <[email hidden]> wrote in message
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Quoted message said:I have been running relatively regularly in the last several months. I
noticed that my pulse now is quite low, it used to be about 60 and now
it is around 52 or so.
This could be a result of two things, an adaptation to running, or
insufficient dose of thyroid hormone that I am taking to compensate
for absense of 2/3 of my thyroid.
I would like to know if, in your opinion, regular jogging over the
period of about 8 months could lead to change in RHR from 60 to 52.
i
Not only RHR, but your HR at all comparable efforts will be lower of course,
though as a controlled measure RHR is the best. Changes in RHR can indicate
over-training, or the onset of an illness. I always forget to check mine
early in the morning before getting out of bed - the best time. When I have
in the past it's close to 40 when I'm in shape, mid 40's when I'm slightly
out of shape.
As an aside, weight loss makes a dramatic difference in running HR. Since my
weight is down this year, my rested walking HR is down at least 10 bpm, and
my slow running pace is down about the same, which enables me now to run at
less than 70% max HR (if it's not hot).
When exercising, I find my HR more responsive the better rested I am. That
is, if it goes up easily in response to an increase in speed, that shows the
muscles are rested and the tanks are full. If it's at all sluggish to rise,
I'm either not fully rested or low on glycogen, or both.
During a long exercise session HR will change also, with cardiac drift, yes,
but also in the first 45 minutes or so it can be higher if you're very well
rested, which is why it's very important to go slow early in long races.
-Tony