Fair enough Lit. Seems a lot of importance has been placed on the word 'information'. And technically the weight/speed relationship can't be linear, because if it was, by the time I hit my target weight, I should be able to run sub 30 minutes for 10k.
I won't. But I will run faster than I did when I weighed 10kg heavier. Its up to others to find out their own best weight, if they can.
At last - he agrees
I too have absolutely no doubt I'd run Wokey quicker if I was 3lb lighter - just not 90 secs quicker!!
CC82 - I love food too! Eating sensibly for the past two months has not been helped by the fact that my wife, who is a cookery writer, has been recipe testing cakes and puddings! Despite distributing as much as we can to neighbours and work colleagues it has still meant a big increase in my pudding and cake intake
Dachs - no snow here yet. Blinding session by the way!
10M hillly, very muddy XC today. Was OK, but legs feel a bit mashed after - nearly time for the Wokey mini taper to start, so no more long runs!
RicF - I'd call it a whole lot of 'assertion' rather than 'information'. You can also find 'information' about how motion control shoes will prevent injury if you are an overpronator (randomised controlled trials failed to confirm this 'fact') and in the 19th century you would find 'information' on how to treat asthma by bloodletting or how to evaluate a person's intellect from the circumference of their head. I do not dispute that being lighter can make you faster (I am trying to shed a few pounds myself), but I have struggled to find research to back up the numbers that are bandied about. After PubMed/google Scholar searches I do not see where '2 secs per mile per pound' and '1% speed per 1% weight' come from and suspect they are zombie statistics. And PMJ, these things can't be worked out from first principles: bodies are complicated, so you can usually come up with a reason why something should happen and another reason why the opposite should happen e.g. 'light body takes less energy to move' vs. 'starved body is reluctant to expend energy'.
We could attempt a randomised controlled trial e.g. two parkruns 4 weeks apart, one group diets in between, the other doesn't.
Well put Marrows My own case in point was the before and after holiday example I gave. Very little difference from training to take account of, so the only real difference was my weight. OK, I didn't run a before and after half, but I know damn well if I had run one just before the holiday there's absolutely know way on Earth it would have been 1:17:20 compared to the 1:19:53 I did with the extra 5lbs on board!
Anyway - good to hear the Achilles is holding up. Fingers crossed you can make the Wokingham start line!