Last night I knocked out another 'longer' run of 6.2 miles. I felt quite heavy legged but still got through it in about an hour. While I was running I thought about the differences in my Christmas weight for this year and last year and whether my streak run could have affected it.
This year I weighed in at about 85kgs and last year it was 88kgs, a difference of 3kgs. Last year I stopped running for most of November and December and this year I ran every day. I decided to calculate how much fat I might have burnt off due to running.
First we need to convert lbs to kgs - 3kgs = 6.6 lbs
To burn off 1lb of body fat a 3500kcal deficit is required, so therefore 6.6lbs of body fat requires 23100 kcal.
The accumulated mileage of my streak run, which began on November 18 , is 133.6 miles up to the end of December (see the link in the sidebar).
It is normally accepted that 1 mile requires a calorific expenditure of 100kcal (or thereabouts) so I expended 13360 kcal over and above what I would normally expend. This is equivalent to 3.8lbs of body fat.
So all things being equal my streak run can account for a weight reduction of nearly 4lbs. The rest has to be down to dietary changes, such as a reduction in portion size, and a concerted effort not to eat too much Christmas food.
2 comments:
The question my Mrs wanted to know the answer too was - how come you've managed to run over 100 miles in the buff and not been arrested ?
It can't be because of how fast I run so it must be because I look so good naked.
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