I think if I were racing long course I'd separate my carbs from my electrolytes (i.e. eat calories, drink electrolytes), but in short course the intensity is not conducive to eating solids, and I just like to get what I need by sipping away during the bike.
I've used Skratch and Infinit with some success, but have fallen victim to the classic mistake of "I'll just mix this a little more concentrated that what's called for so I get more calories", not having any understanding of osmolarity. Of course the results were not pretty.
Maltodextrin comes in plastic baggies and looks very incriminating
After having made my own protein bars for a couple of years, I figured I'd take a stab at race nutrition. For calories I mostly use maltodextrin, which is easily available at home brewing stores. Maltodextrin has a super high glycemic index, so enters your blood quicker than sugars. Because it consists of big molecules, it allows you to concentrate a lot more calories into a solution than other sugars like glucose or fructose, while still maintaining a proper osmolarity for absorption. There's also sucrose from the lemonade, which is absorbed through different channels so increases your caloric uptake, while having a slightly lower glycemic index, spacing out the rate at which the sugar enters your bloodstream.
Like many of my ingredients, I get my lemonade from Costco
Sprint Drink:
6 tbsp maltodextrin
125 ml Kirkland Organic Lemonade
300 ml water
1 nuun active tab
Calories: 225
Magnesium = 25 mg
Potassium = 115 mg
Calcium = 13 mg
Sodium = 377 mg
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