Calories adjust by weight on PM3/PM4

Please add feature and function requests for PM3 firmware, DLL/API's, and documentation here.
Post Reply
rlddikeman
Paddler
Posts: 10
Joined: April 17th, 2010, 1:06 am

Calories adjust by weight on PM3/PM4

Post by rlddikeman » October 9th, 2010, 11:47 pm

While I can (and do) calculate my more accurate calorie counts using the web site, it would be nice if if I could enter my weight on the PM3 and it would store on my log card and accurately calculate cals while I am rowing based on weight/height or whatever instead of assuming a certain weight man

jamesg
Half Marathon Poster
Posts: 4193
Joined: March 18th, 2006, 3:44 am
Location: Trentino Italy

Re: Calories adjust by weight on PM3/PM4

Post by jamesg » October 10th, 2010, 1:07 pm

If you keep the rating low your weight won't make much difference. At 20 the max body speed is of the order of 1m/s with full length strokes, so the kinetic energy lost at stroke ends is small. In any case the C2 calcs consider us as fuel cells with 25% efficiency (i.e 1 unit of external work implies 3 units of heat in us) and also gives us 300kCal/h free. How accurate are these?

The erg is for getting fit, and this is what it does, if we get on and pull long and hard, as most of us have seen. To imagine anything else is I think somewhat illusory, so can only lead to delusion. Maybe a ½M a day wouldn't leave us enough time to get our knees under the table tho'.
08-1940, 183cm, 83kg.
2024: stroke 5.5W-min@20-21. ½k 190W, 1k 145W, 2k 120W. Using Wods 4-5days/week. Fading fast.

User avatar
Citroen
SpamTeam
Posts: 8010
Joined: March 16th, 2006, 3:28 pm
Location: A small cave in deepest darkest Basingstoke, UK

Re: Calories adjust by weight on PM3/PM4

Post by Citroen » October 10th, 2010, 3:48 pm

rlddikeman wrote:While I can (and do) calculate my more accurate calorie counts using the web site, it would be nice if if I could enter my weight on the PM3 and it would store on my log card and accurately calculate cals while I am rowing based on weight/height or whatever instead of assuming a certain weight man
It's impossible. Even if you were the exact same weight/height/build/fat percentage as me then there's nothing to say that your metabolic rate is the same as mine. The calories displayed on a PM3/PM4 are are a rough estimate, nothing more. Even a weight adjusted formula would be an estimate.

rlddikeman
Paddler
Posts: 10
Joined: April 17th, 2010, 1:06 am

Re: Calories adjust by weight on PM3/PM4

Post by rlddikeman » October 10th, 2010, 4:22 pm

Gosh folks, I was just asking since this available via the C2 website. I realize it's an estimate on their website. The cals on the pm3 isn't a valid estimate for a smaller woman. It's a feature request not a complaint

User avatar
Citroen
SpamTeam
Posts: 8010
Joined: March 16th, 2006, 3:28 pm
Location: A small cave in deepest darkest Basingstoke, UK

Re: Calories adjust by weight on PM3/PM4

Post by Citroen » October 10th, 2010, 4:44 pm

rlddikeman wrote:Gosh folks, I was just asking since this available via the C2 website. I realize it's an estimate on their website. The cals on the pm3 isn't a valid estimate for a smaller woman. It's a feature request not a complaint
The cals on a pm3 isn't a valid estimate for anyone, nor is the stuff on the website.

Post Reply