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By my understanding, the general rule of thumb is, on a moderate to hard ride you will burn 600-1000 calories (depending on weight, effort etc)

I've just done a 1 hour turbo session where I averaged approx 200W. According to the bastion of truth Strava, this means I burned 651 kJ. Various unit convertors on the interwebs tell me this is 155 calories.

So, my question is, where did all the other calories go? Did I really only burn 155 calories on what felt like a pretty hard interval session?

Thanks

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glynr36 [637 posts] 1 year ago
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Your conversion doesn't take into account human metabolic efficiency, around 22-26% (most places quote 24% as the middle ground, I've seen a few sources saying 18-30).
So kCal (burned)=[(kJ/4.2)/0.24)].
In your case it's 645 kCal.

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Jimmy Ray Will [455 posts] 1 year ago
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As above... in loose terms, you can simply swap Kj with Kcals to estimate your calorific burn.

An hour at 200w for 650 watts burnt seems about right to me.

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glynr36 [637 posts] 1 year ago
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Jimmy Ray Will wrote:

As above... in loose terms, you can simply swap Kj with Kcals to estimate your calorific burn.

An hour at 200w for 650 watts burnt seems about right to me.

Why didn't I just put it like that ha!

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Eg3ftp1 [65 posts] 1 year ago
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Good effort... For a bit of perspective, in his book "faster", Michael Hutchinson says he burns 1400 kCal in an hour at 25 mile TT pace, and that's still not enough to beat Wiggo!