Well – i’ve had a day off today – spent it catching up with all the “domestic” stuff plus a little side project with photography. I’m a moderator on a photography Forum (yes, there is a life outside of Blogging, MFP, Garmin Connect and the riding the Bike…) and last year I decided to mark my Birthday with a “Travelling Camera” thread – I boxed up a plastic fantastic Holga film camera, 5 rolls of film and a bunch of prepaid return envelopes for the film. I then called for volunteers to shoot some pictures on film – a new experience for some of the members Anyway – to cut things short, the second roll of film finally popped through the letterbox yesterday – so I just HAD to develop and scan the pictures, didn’t I
To be honest though, I’d had three pretty tough (for me) days on the bike – I’ve been trying to up my mileage, and the last three days have seen me manage 92 miles – not bad for someone who was averaging maybe 7-8 miles a day last August!
Anyway, while I was waiting for the negatives to dry, I spent a while on the computer, going over my calorie burn figures etc. and had a little bit of a scary thought. I’ve been booking down the calorie burn from the Garmin, as an addition to the figure given to me for food rations by MFP. The problem is, as I understand it, the Garmin’s figure is the TOTAL # of kcals burned in that 105 minutes. Which means If I add in this total to MFP I’m double-counting my BMR for that 105 minutes. It’s not been over critical, as frankly, I’ve not been eating back most of the exercise calories – however – as the time on the bike is increasing, as is the number of kcals burned, obviously i’m going to have to begin to do so – otherwise i’m going to end up with the dreaded “bonk” 40 miles from home…
Also, it helps explain the “hole” in my figures – I’d calculated my food shortfall calories, added in my riding calories, totalled the figures up each month and divided by 3500 – the figure my Dr. told me constituted a lb. of body fat. And whaddya know – I was losing a bit less than I should have all the time. However, re-visiting the figures with the “BMR Adjustment” applied, and the overall accuracy improved quite substantially. At the moment, I’m not going to worry about this – it’s quite a chunk of extra math/spreadsheet work, but as the miles increase, and the time on the bike goes up, the “buggeration factor” will become more material.
To put a few figures on it – yesterday’s ride was 1h45m – and booked as 2116 kcal. My BMR per the MFP tools is 2239kcal/day or (2239/(24*60)=1.55486kcal / minute – or 163 kcal for the ride duration. So – I should have booked the ride as 1953 kcals instead.
So In summary: What We have learned today:
- It was sunny and dry, and I should have gone out on the bike.
- Old School film takes too long to dry, and leaves me too much time to think about things.
- I need to keep busier, or I end up over-thinking things.