Heart rate
302 watchers
Nov 2016
4:03pm, 17 Nov 2016
59,316 posts
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Gobi
In theory you burn the same cals per mile whatever the speed
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Nov 2016
4:15pm, 17 Nov 2016
1,298 posts
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larkim
That's what I thought. So the difference between a fast run and a slow run in terms of nutrition should only be whether your energy stores can be converted fast enough, not whether you need more / less. Presumably on a slow run the transfer from stored energy to used energy is a slower process so you don't need to input foodstuffs which can be converted at a faster rate (e.g. gels etc). |
Nov 2016
1:52pm, 18 Nov 2016
5,933 posts
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The_Saint
There is the big element of suggestion at play, I used gels for 20 miles and beyond until I read an article by some ultra runner (may have been Scott Jurek) who advocated eating "real food" such as a fruit and nut mix rather than gels - so I did that for a while until I forgot once and realised after the race that I hadn't noticed any difference. Similarly ran a 20 mile training run and forgot about the half-litre drink I had in a rear-facing waist band until I sat in the car and felt it pressing into me, only then did I ask myself if I was thirsty.
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Nov 2016
2:11pm, 18 Nov 2016
1,303 posts
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larkim
There's definitely some "sheep mentality" involved. I've only ever signed up for one marathon (and got injured in the training, so didn't do it), but one of the first things I did was invest in a drinks holder and some gels to try out as I'd heard from some colleagues that they were essential. It wasn't until I started reading afterwards that I began to appreciate that they weren't an obligatory part of longer distance running, and that I had other options (including nil by mouth) instead. Up to then as a half marathoner it had never really occured to me that I might need nutrition or liquids on the way so I've never bothered with either for halfs - though the first time you line up for your first race and see plenty of individuals loaded with drinks and food you do wonder what you're missing out on (nothing, as it turns out!). |
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Nov 2016
7:55am, 19 Nov 2016
59,323 posts
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Gobi
I carry nothing and drink nothing up until a half when I may carry a gel which I often finished with. Body can cope |
Nov 2016
8:34am, 19 Nov 2016
20,191 posts
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eL Bee!
Some bodies can cope. Whereas in theory the number of calories and energy expended per mile may be similar (although that is also hugely variable) the person on their feet for twice the time will still expend more overall energy. And our individual genetic and physiological make ups mean there is no one-size-fits-all as depending on how hard we are running relative to our own limits will also determine what energy system we are accessing and how quickly we are depleting it! Just sayin' |
Nov 2016
9:29am, 19 Nov 2016
5,835 posts
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paul the builder
""depending on how hard we are running relative to our own limits will also determine what energy system we are accessing and how quickly we are depleting it"" Yes, absolutely. But obviously the runner who takes 2h15m to run their HM will have to be *more* aerobic than the runner who takes 1h15m. And they'll have greater access to energy converted from fat as a result. Same's true for a marathon (I could have just used marathon time examples, don't know why I didn't!). So I think I'm reaching the conclusion that faster runners need gels (or other energy top-ups) in a marathon more than slower runners do. Seems logical, no? |
Nov 2016
10:20am, 19 Nov 2016
2,045 posts
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TeeBee
Having been in a low carb diet for over a year and having just run Beachy head marathon on the back of training without any supplements at all, I'm really interested in this discussion. The guy who wrote 'What the fat?' book has also written a book on sports performance and a low carb diet. I'm half way through it, but the theme seems to be that you will loose a little performance at the high intensity end of your sport, but this can be mitigated by addition of some carbs post training. It's interesting stuff. |
Nov 2016
10:43am, 19 Nov 2016
2,466 posts
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Ninky Nonk
I suspect the ability to process lactate would have a big effect on need for gels or otherwise. en.m.wikipedia.org Similarly individual running economy, basically the energy cost of running, can vary for individuals across different speeds. Some people are relatively more economical at faster than slower speeds than others - normally dependant on their best event. So given well trained (and probably faster) people would relatively process lactate more effectively and have better running economy at race paces I suspect that they generally might need gels less than less well trained people. |
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Nov 2016
11:02am, 19 Nov 2016
5,936 posts
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The_Saint
Old timers in the running scene never cease to observe that in the 70s and 80s club runners were indisputably faster* and never worried about drink and eating during a race. * I have seen too many sets of race results for the same race going back 20+ years, it is quite depressing actually. |
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