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Nov 2023
2:04pm, 1 Nov 2023
6,675 posts
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Oscar the Grouch
Because they are sat down and not blowing out thir arse! 
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Nov 2023
2:05pm, 1 Nov 2023
6,676 posts
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Oscar the Grouch
*their*
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Nov 2023
2:24pm, 1 Nov 2023
22,491 posts
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larkim
LOL! Not sure that's a good reason why it's easier to digest more carbs though? Certainly at the beginning of a marathon, for example, a runner shouldn't be at a huge disadvantage to a cyclist in physiologically being able to consume 120g; I might be wrong, but I don't think there was a rule of thumb previously that 90g was only for cyclists and a lower figure was applicable to runners.
The tone of the article I linked to was that "science" was helping with the formulation of carb intake mechanisms which can result in higher carb absorbtion. A bit like the push forward a few years ago where it was evidenced that if fructose and glucose (I think it was those two) were consumed in particular ratios you could get more carbs absorbed than if just one or other of the two sugars were consumed.
What I'd be really interested in would be whether there is anything which pushes forward the window through which the gut will inherently be "open" to new carbs coming in. I'm very very very sketchy on the physiology, but what I've read suggests that as the rest of the body gets fatigued, the brain manages the resources in the body to focus on those which are being worked hard, and as a consequence the gut gets de-prioritised which is what can lead to gastric distress or lower absorption levels. For me, based on the road marathons I've done, that comes somewhere around mile 15-18. Or at least I think it does - certainly that's the time when even taking a sip of water starts to turn my stomach, and I can't bring myself to "force" a gel down.
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Nov 2023
2:32pm, 1 Nov 2023
136 posts
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Charlesvdw
I have the same issue around mile 15-18 even when using Maurten gels.
As Oscar explains so eloquently, I suppose it has to do with the body's movement during running.
Cyclists don't have their guts going up and down, that's why it probably is easier for them to continue taking gels.
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Nov 2023
2:33pm, 1 Nov 2023
426 posts
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Forrest Jooligan
2 factors which might reduce how many carbs a runner can tolerate vs a cyclist spring to mind: HR & impact.
HR is higher when running & every step causes the stomach to oscillate.
Or maybe this is also contributing to the incredible marathon performances we’ve been seeing lately? We’ve ascribed it to the shoes because that was what produced the biggest change initially & they came with some heavyweight marketing.
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Nov 2023
2:42pm, 1 Nov 2023
20,818 posts
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Chrisull
Bad luck Daz and WW. It sucks.
Physio has offered me some small hope. Says dog has not caused further damage in knee, that it doesn't seem to be a meniscus tear, and that if I spend all this week getting the swelling down, I may be able to run uphill/and on flat next week.
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Nov 2023
2:48pm, 1 Nov 2023
48,289 posts
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HappyG(rrr)
I did a fun, random variation in fuelling in this last marathon - instead of 8 gels or even 6 that I have struggled to consume in last couple of maras, I had 4, but then stashed a 500ml Lucozade drink at mile 23 (with 500ml before race and 4 x gels - SIS berry with caffeine, 5, 10, 15 and 20 miles) for that final push. It worked quite well, as it was easier to keep sipping it down for last couple of miles. Might have been placebo, but was quite pleased at a change that worked (after marathon 18 / or 25 if you include ultras!) G
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Nov 2023
2:52pm, 1 Nov 2023
22,492 posts
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larkim
I can buy the logic of bouncing up and down for runners making it easier to consume. In principle.
But has that ever been a topic for consideration before when discussing the carb intake limit for endurance athletes? I've not seen it previously, so happy to be proven wrong. Or are we hypothesising that with the new "tech" allowing more carbs in that the limit that runners are already at can't be exceeded, whereas there is that window for cyclists?
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Nov 2023
2:59pm, 1 Nov 2023
48,290 posts
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HappyG(rrr)
The logic I heard (for ultra runners - and not a scientific study, just anecdote, I think) was blood moving away from gut, so processing becomes harder. The body prioritising the systems under strain - the muscles, lungs, heart. Same argument for inability to think properly, blood or other chemicals or control hormones or whatevs, being de-prioritised from non-essential systems.
So the easier on the tum the carb content can be, the better. G
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Nov 2023
3:06pm, 1 Nov 2023
15,758 posts
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jda
Of course it’s harder to digest food when exercising hard. If you don’t believe me try stuffing down a large curry and couple of pints and then going out for a brisk 10-miler.
Or even, take it with you and eat on the move
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