Calorific 305

dario28

Did an 80km spin on Saturday from Portmarnock - Swords - Naul - Drogheda and back

Didnt really know what state the roads were in so took it handy on all descents

Mr Garmin said the following 80kms - 3hours - avg HR150 -Peak HR 176 - Avg Speed 27km

Then the Calories - 3028

There is no fooking way I would have burnt that much....anyone got similar crazy readings ??

Im about 5,9 and weight just under 80kgs

Lumen

It's a known issue. If you increase the weight in your Garmin settings (e.g. double it) you will get a more accurate figure.

niceonetom

Is the advice out there not usually to half your weight?

Nietzschean

i also heard just taking 60% of whatever figure it gives you

Lumen

niceonetom wrote: »

Is the advice out there not usually to half your weight?

Yeah, sorry, that would make sense.

I've looked at a couple of examples from my ride files (comparing Garmin calories to more accurate stats from the power meter) and the error factor varies pretty wildly (e.g. 1.4-2).

I don't think they're a very useful metric if you're trying to do accurate balancing on calories in and out, but maybe better than nothing.

ROK ON

I have read that a reasonably descent training session on the bike should burn 700cals/hr. However it depends on a few factors.
1. What HR zone you are in. Obviously not burning a huge amount descending or being propelled along with a savage tailwind so it is related to effort.
2. Related also to ruder weight.

For me at 88,5kg I use a 700 rule of thumb. My Garmin would spit out anywhere between 1000 and 1400 per hour.
Flat spins going at a constant effort are best. In that very hilly spins one is at high effort for half and very low effort while descending.

dario28

ROK ON wrote: »

I have read that a reasonably descent training session on the bike should burn 700cals/hr. However it depends on a few factors.
1. What HR zone you are in. Obviously not burning a huge amount descending or being propelled along with a savage tailwind so it is related to effort.
2. Related also to ruder weight.

For me at 88,5kg I use a 700 rule of thumb. My Garmin would spit out anywhere between 1000 and 1400 per hour.
Flat spins going at a constant effort are best. In that very hilly spins one is at high effort for half and very low effort while descending.

Yeah its a bit all over the shop alright , considering it took 1hr 45 to get to Drogheda with wind and unknown roads and 1hr 15 back , so garmin would have had 2000 or so cals burnt getting there

Beasty

I spent about a year using a variety of Polar HRMs on my regular commute, and over the past year or so have used a Garmin 705. The Polars (consistently) recorded a calorie output about 25% less than the Garmin for the same journey.

Ryder

Whatever about the absolute values, the readings tend to be consistent so are some indicator of the work done.....almost as if it were a power meter......