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  1. #1
    Senior Member Tall Cool One's Avatar
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    Calorie/Fluid/Sodium Absorption Rates for 240 lb Cyclist

    I am a 6' 7" 240 lb rider and I have been doing a lot of reading on Hammer Nutrition's website about how much nutrition to take in each hour. I am preparing for Ride Across Indiana (160 miles) in July and want to nail down my nutrition for the event.

    I estimate that the ride will take me about 9 hours including rest stop time.

    According to Hammer, the following substances have the below absorption rates

    Loss vs. Assimilation
    What can your body really handle?
    SUBSTANCE RATE LOSS/hr______________ASSIMILATION RATE
    Fluids (ml) 1000-3000 (30-90 oz)________500-830 (17-28 oz)
    Sodium (mg) 2000____________________ 500-700
    Calories 700-900 _____________________240-280

    Below are the corresponding replenishment values that we have observed for the averagesize endurance athlete (160-165 lbs/72.5-75 kg) who is fit and acclimatized (+/-5%):

    SUBSTANCE IDEAL REPLENISHMENT
    Fluids 20-33%
    Sodium 20-35%
    Fuels (Calories) 30-40%

    My question is....Does my 240 lb body absorb more fluid/sodium/calories than the "average" 160 lb endurance athlete? I know I burn more calories, go through more fluid, and I assume I go through more sodium than the "average" endurance athlete.
    Last edited by Tall Cool One; 01-18-12 at 07:04 AM.
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  2. #2
    just another gosling Carbonfiberboy's Avatar
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    One can't nail this down, since every ride will be a little different, depending on training, recent history, course profile, winds, and temperature. All this stuff affects both loss and assimilation rates. By July, you'll have it figured out as you train. Both loss and assimilation rates are trainable, BTW.

  3. #3
    Senior Member Tall Cool One's Avatar
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    Quote Originally Posted by Carbonfiberboy View Post
    ...Both loss and assimilation rates are trainable, BTW.
    How can you train your body to lose less fluid/sodium/ burncalories or train your body to assimilate more fluid/sodium/calories?

    I'm curious.
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  4. #4
    just another gosling Carbonfiberboy's Avatar
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    You can get your calorie burn down by training to be more efficient at your chosen speed, mostly by acquiring the flexibility and strength to hold a more aero position.

    Hammer has a lot to say about sodium balance that I don't remember, but I think sodium loss is trainable by hot weather training, fluid loss the same.

    Assimilation is more straightforward. Basically, you pummel your stomach with as much food and fluid as it can handle. Over time, it responds by becoming able to move more stuff across the stomach wall.

    Basically, this is how RAAM and other LD competitors manage what would seem by casual calculation to be impossible feats. More information at http://www.ultracycling.com/

    Your body is a chemical machine that responds to training. All of it.

  5. #5
    Senior Member Tall Cool One's Avatar
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    Quote Originally Posted by Carbonfiberboy View Post
    ....Assimilation is more straightforward. Basically, you pummel your stomach with as much food and fluid as it can handle. Over time, it responds by becoming able to move more stuff across the stomach wall...
    I love this kind of training. I have been training this way for decades. Trust me, I have moved a lot of nutrients through my stomach wall!!!!!!

    But seriously, thanks for the input. (p.s. Please don't take my flip responses as being unappreciative.)
    Last edited by Tall Cool One; 01-18-12 at 08:44 PM.
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    "Hey, let's be careful out there."
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