calorie counter

[oster]

Hi,

It seems after i updated the firmware on my concept 2 pm5 it dosent count the calories right anymore.
calories per hhour seems right but total dosent macth, any one of you have the same issue? and maybe a solution to fix it?
https://imgur.com/a/6m7pEYx

[MPx]

I couldn't see your picture without accepting cookies....but stuff you should perhaps be aware of if not already.

The erg and PM5 is a very accurate measure of the work that you are doing. This is expressed in either pace or watts. There is also the potential to display calories, but this is at best a very rough estimate and makes all sorts of assumptions about the individual on the erg which cannot be accurate given the differences in sex/size/metabolism/etc.

If its burnt calories that motivates you then its fine to see relative burn in different sessions, but it would be a mistake to think that it has ever been an accurate calorie counter.

[oster]

https://postimg.cc/CBD8Wj2N hope this link is better.
I am just wondering why it changed from being somewhat accurate to be way off.
yesterday i did a 1 hour row.

calories per hour is 884
and it says i burnt 2666 calories

on 10k row its tells me 6000 calories
its just weird the calories per hour hasent changed.
but calories burnt is way off now.

hope it make sense

[Tsnor]

It's clearly wrong. Not sure if it's "uninstall ergdata, reinstall" or if it's "reset pm5" or "log had a bad day"

Best is to email concept2 at info@concept2.com give snapshots, firmware version, ergdata version, say if it still happens or if it was only once.

Aside: your PM5 has a history function that will show you the calories that the PM5 thinks you burned on that workout. You can see if it's the same as the log or different.

[p_b82]

Ignoring the fact that something is clearly wrong - unless you are the "perfect" human that C2 modelled the calorie calc on, it's going to be off anyway, as it is a generic calc based on some quite big assumptions. (essentially only any use for rough ballpark figures imo - 1hr at x pace is more work than 45mins at Y pace sorta thing).

[gvcormac]

Ignoring the fact that something is clearly wrong - unless you are the "perfect" human that C2 modelled the calorie calc on, it's going to be off anyway, as it is a generic calc based on some quite big assumptions. (essentially only any use for rough ballpark figures imo - 1hr at x pace is more work than 45mins at Y pace sorta thing).

Well, the C2 is an erg so it knows how many calories you're delivering to the flywheel, regardless of pace, drag factor, etc. What it doesn't know is your metabolic efficiency or, for that matter, mechanical efficiency.

Personally, I'd like to see a cumulative measure of external work done, but C2 has decided not to provide that. e.g. kwatt-seconds = Kjoules. Easy enough to calculate from power and duration, but still I'd like to see it.

[Sakly]

This calorie stuff is the most useless metric on any erg.
Same applies to the calories of food. It's a heat unit and does not tell anything about how efficient the body produces the power for the erg nor metabolizes the macro content of food.

Apart from this: yes, the logbook overall line gives a completely wrong calorie value. In this example it seems to report factor 3 of the actual value.