Skinny riders how do you fuel on rides 3 hours plus?
jheg
Posts: 15
I've often heard people say they hit a wall then get a second wind but I wonder if body fat alone helps some riders go further. I'm quite tall and very skinny and I find if I go out on a 3 hour ride if I don't fuel during that ride I'm going to start feeling depleted after 2 hours for a Z3+ ride yet other heavier guys seem to be able to sustain for longer. I know that fitness comes into it but all things being equal assuming equal fitness does a skinnier guy with less fat reserves need to stay more topped up than a heavier guy?
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Mind you, I only average 26-27 kph, so you might well need more if you go faster
e.g., someone with an FTP of 300w at 85kg can cruise along at 220w fairly comfortably for a few hours without needing to fuel that much, but if your FTP is only 270w at 60kg, 220w for you is a lot more work. There's some aero advantage to being skinny/small but only if you have a good position on the bike. Uphill is a different story of course.
The harder you ride, the more you deplete glycogen more than fat and vice versa. So if you're fuelling on nearly all glycogen (a decently hard effort for a couple of hours) you will hit the wall long before someone riding at more fat-burning intensity.
I found that I was fine for 1hr 15ish min smash yourself to bits rides but anything coming up to 2hrs plus needed bananas, flapjacks, the suchlike (never been a great fan of gels but electrolyte drinks etc I'm fine with). Used to eat like a pig when getting home though.
I think it's down to how your body works - try different things for 1 month long sessions and go with (literally) your gut feeling: just because it works for someone else doesn't mean it'll work for you.
De Sisti wrote:
This is one of the silliest threads I've come across.
Recognition at last Matthew, well done!, a justified honour
Na I normally take out 2 energy gels and 1 bar, per hour for a ride of longer than 1 1/2 hours, unless there's a cafe stop involved. So a 3 hour sportive/ride would see me take 4 gels and 2 bars, of which i would expect to return with 1 bar and 1 gel (1st hour doesn't need any gels or bars) and my 1st gel would be around about 1 hour and 15. then something gel, bar, gel every half hour.
If a cafe stop is involved then its 2 gels and a bar, just in case.
My problem is getting enough fluids, i'll get through a bottle every half hour but can drag it to 45 mins if need be, so 2 bottles isn't enough for me regardless of hydration levels before the ride.
you get 9kcal per g of fat, you get 4kcal per g of carbs (stored as glycogen)
at low effort, the body can metabolise fat fast enough to keep going a long time - i.e. walking, or easy cycling, you can do that a long time
afaik typical fat metabolism reaches c. 35g/hour, that's 315 kcal, training can help improve this, but there's a limit, and once effort reaches a certain point, the rate actually falls, eventually becoming negligible
i.e. as effort increases, the proportion of energy taken from carbs increases until it accounts for almost all of it, this is what limits how long high effort can be sustained
with the right mix of ingredients the typical maximum carb intake is about 90g/hr (2:1 glucose:fructose) which is 360kcal
the need for fuelling on the go depends on how far/hard the ride is
aside from training, i'm sure the others you mention will have stoked up well before the ride, you can do the same, if you start a ride with typical glycogen reserve, you've got c. 2000kcal (plus the larger fat reserve that'll help at lower effort) and you can replenish at 360kcal/hour
fwiw i'm skinny, for rides where i'll be burning 4000-5000kcal i need to make sure i eat correctly in advance, and then i start topping up after 20-30 minutes (and post-ride i'll carry on eating to replace the defecit), otherwise eventually i'll grind to a lightheaded/dizzy halt, i've done that, it's not pleasant! but if i'm only going to need 1000-1200 kcal, i don't bother eating on the go, just make sure i start fuelled and get energy in as soon as the ride ends
You can train your fat burning by doing lots of longer rides slower on little or no food but then when you want to perform eat or you'll bonk.
If I have a big ride planned like tomorrow I make sure I eat before. Today I am carb loading (as I ride nearly every day I carb load every day I live on carbs) and tomorrow morning the breakfast will be a huge bowl of porridge. That way I am fine for the first 2 hours then I need to start eating.
Had the light headed/dizzy feeling I had all to often when I went out for a longer ride stayed out for longer than I planned.
It does not matter if you are skinny or big. There is only so much fat you can metabolise per hour and only so much ugar you can absorb and turn into glycogen per hour. Exceed these limits and you will bonk.
For mid-distance rides (think 75km or so) with mid levels of elevation (750-800m gain in the 75km) I am absolutely fine getting up and doing the first half on an empty stomach, cafe stop half way through for a slice of cake and a coffee, complete the rest of the ride and stop at the chippy on the way home for some proper refuelling