2011/8/14 David García Granda <dgra...@gmail.com>
>
> >
> >
> http://www.myfitnesspal.com/blog/Azdak/view/calories-burned-during-exercise-it-s-the-intensity-not-the-heart-rate-that-counts-26524
> >
> > There it is stated that the MET does NOT depend on the heartrate. But as
> far
> > as I understand it should depend on the type of exercise. In the case of
> > running and cycling on a flat ground, I guess it should be mainly a
> function
> > of the speed. But in general it should also depend on the change of
> > elevation.
>
> > It is an interesting topic. I found the following document:
> What I understand from it is MET (objective/fixed intensity) remains
> the same for everyone (same slopes, etc.) and the only variable that
> influence energy consumed is weight. He plays with the relative
> intensity concept (measured with Heartrate and VO2 max) that can
> change through training.
>
But MET also depends on the type of activity. By definition it is 1 for
resting. So when restricting to running, it should depend on the "intensity"
of running. The question is, how this intensity (MET) can be measured. The
statement of this article was that heartrate is not appropriate. But I guess
that it depends on the speed and incline. There is an obvious energy that
one needs to lift a mass, the potential energy. From this, it should be easy
to calculate the intensity of the activity "lifting your body from height x
to height y during the time t). This is involved when running with incline
different from 0. But there is also energy needed for running at the same
height. And I guess this depends on the speed of running. I do not know a
formula for this case, but I am sure that one could find tables with MET for
different speeds. Then one could interpolate these values.
> > I propose the following:
> > 1) Confirm the correctness of this article.
>
> To be honest it is beyond my knowledge to confirm if this article it's
> correct or not.
>
> > 2) In the cases of cycling and running: Try to find a formula to express
> MET
> > in terms of GPS data and the type of sport (it should depend on speed and
> > incline). So MET it time-dependent. When resting (more precisely: lying),
> > MET should be 1. Therefore one may possibly use a fixed value for the
> > resting times, probably close to 1. Then one can calculate the energy
> > (calories) burned using these "local" METs, which involves basically
> summing
> > up the METs.
>
> I find your proposal very interesting, but pretty complex to
> implement. I would go for a simpler one: each sport has one default
> MET and interested users would be able to change it (based on their
> own criteria) on per session ('Advanced' tab when editing entry) in
> order to achieve more accurated figure for his/her training session.
> What do you think?
>
In my opinion this simplification is too strong. There are the extreme cases
of sprinting and of slowly walking around (or the extreme case: standing
still). All are covered by the activity "running", but the intensity of them
will be quite different.
I am not a developer of pyTrainer, but I would prefer no value for burned
energy instead of a evidently false one (see the examples given my the
starter of this thread).
I think it should not be too complex to implement once one knows a formula
for the MET depending for example on speed and incline (and these can be
calculated from the GPS data). A quick search provided this:
http://www.exrx.net/Calculators/WalkRunMETs.html
This calculator demonstrates also that MET depends on speed and incline
(grade).
There is no formula written there, but it can be derived from the JavaScript
code. I did not check the references he provides. Maybe a formula can be
found there.
Best,
skew41
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