Hi,
>> > 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.
Sure, I fully agree, but until we have this formula, I would rely on
end users the task of finding the right one ;)
>> > 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.
>From your comment I think I didn't explain it well: my proposal is to
have a default one for each sport as it is now, but add the chance for
end user to introduce a customized (by him/herself) MET value when
calculating calories (default way is relying on what ir comes from the
HRM) so pytrainer does calculation based in the value entered for the
session.
> 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 depends on accuracy: is it your gps receiver accurated
enough?. I agree we should try to be as much accurated as possible.
> 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.
It would be great if you can provide mentioned formula.
Regards,
David
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