Hello,
2011/8/12 David García Granda <dgra...@gmail.com>
>
> >
> https://sites.google.com/site/compendiumofphysicalactivities/Activity-Categories/bicycling
> >
> > However, the MET value is not per training session but per sport, which
> is problematic.
>
> > I have set the MET of bicykling to 9.0 after considering
> That's right. To be honest it looks pretty complex to change MET's
> value according how hard sessions are, not really sure which way to go
> in order to overcome the issue...
>
> > Another problem is that the calorie counter function seems to use the
> > total time, not excluding pauses recorded by Forerunner 305.
>
> For tracking purposes, following link leads to how Calories (kcal) are
> currently calculated in pytrainer:
>
> http://sourceforge.net/apps/trac/pytrainer/browser/pytrainer/trunk/pytrainer/gui/windowrecord.py#L647
>
> > When I compare the calorie counts of two training sessions, I got weird
> results:
> >
> > Case 1. bicykling, duration 1:42, 44 km, average pulse rate 144 => 594
> Cal
> > Case 2. bicykling, duration 2:32, 39 km, average pulse rate 130 => 1188
> Cal
> >
> > Case 2 had a reported total time of 1:55 according to Forerunner 305.
> >
> > 1. Is the duration problem due to my use of garmin-forerunner-tools as
> > import plugin? Should I use something else instead?
>
> I would say the issue is not on your side, but on pytrainer's one. As
> far as I understand the way Calories are being calculated (see link
> above), it takes the complete activity duration and this is not
> correct.
>
> Newer versions do show workout's status in register tab
> ("active/paused" I guess, not sure since I have it ES localized) so it
> shouldn't be too difficult to retrieve those values and compute more
> accurated energy value.
>
> > 2. It seems as if the average pulse rate is not taken into account
> > when the Calories are calculated, but why is that?
>
> To be honest, I don't know. I guess somehow pulse should be included
> in MET when calculating energy using basic formula, but as we have
> just one MET per sport so far, then it would be congruent to have
> another variable to stress intensity. Any ideas or written literature
> about how to tune MET based in average heartbeat? I think it would be
> the simplest approach here.
>
It is an interesting topic. I found the following document:
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.
I propose the following:
1) Confirm the correctness of this article.
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.
Best regards,
skew41
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