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Metabolic rate calculations - Muscle = X calories?

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YumPies
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2008/05/22 01:38:55 (permalink)
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Metabolic rate calculations - Muscle = X calories?

So bob lost 2lbs in 7 days eating 2000kcals.
Hes not sure if any was muscle or fat, but wondered what his metabolic rate is.

If it was purely fat, thats 2lb * 3500 = 7000kcal over 7 days = 1000kcal deficit per day.

2000kcal eaten + 1000kcal deficit = 3000kcal to maintain weight.
However he then finds out it was 1lb of muscle, 1lb of fat...

What is his metabolic rate? How many calories in 1lb of muscle? Calculating metabolic rate seems to have just got a bit more difficult.
#1

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    sassbs11
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    RE: Metabolic rate calculations - Muscle = X calories? 2008/05/22 02:41:13 (permalink)
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    dont quote me on this but wouldnt it be the same.
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    theiopener
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    RE: Metabolic rate calculations - Muscle = X calories? 2008/05/22 07:22:33 (permalink)
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    who cares

    human body isnt that simple so silly equations like the above serve no real world purpose
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    samcim
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    RE: Metabolic rate calculations - Muscle = X calories? 2008/05/22 07:45:30 (permalink)
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    IIRC a lb of muscle is a measly 600cals to burn off.
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    #Hench
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    RE: Metabolic rate calculations - Muscle = X calories? 2008/05/22 08:54:18 (permalink)
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    ^^ thats worring.
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    theiopener
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    RE: Metabolic rate calculations - Muscle = X calories? 2008/05/22 09:29:31 (permalink)
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    ^^^ why is it worrying?
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    YumPies
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    RE: Metabolic rate calculations - Muscle = X calories? 2008/05/22 13:22:29 (permalink)
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    ORIGINAL: samcim

    IIRC a lb of muscle is a measly 600cals to burn off.


    Yeah thats what i read according to some biological journal thing apparently, but never got to see the actual journal.

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    Nigeepoo
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    RE: Metabolic rate calculations - Muscle = X calories? 2008/05/22 13:46:04 (permalink)
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    Burning muscle in a bomb calorimeter isn't a very good guide as to what goes on in the body. Your body "burns" muscle when cortisol is high. However, when cortisol is high, you get more water retention, so the weight loss you get isn't the weight loss you expect.

    It takes far more kcals to synthesise 1lb of muscle that you would expect by looking at how many kcals there are in 1lb of muscle.

    The best thing to do is not worry about the nitty-gritty of how it all works and just eat, monitor and....y'know the rest!

    If Bob lost more than 1% of his bodyfat weight per day, he probably lost some muscle as well as body-fat but how much, it's impossible to say.
    #8
    YumPies
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    RE: Metabolic rate calculations - Muscle = X calories? 2008/05/22 15:07:30 (permalink)
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    Yeah im not really bothered about applying it, just want to know for knowledge sake.
    Bugs me when i have questions and cant find the answers, by nature i want to know "How".

    Also knowing how much weight loss to aim for as you get leaner is something i want to know, as we can apply that to avoid muscle loss. No doubt maintaing ~2lb a week is a bad idea when we get to 5% BF... So is it bad at 8%? 10%? 15%?
    So far ive only read about lyle's "maximum deficit" number of 31kcal lb/day and nothing else.
    #9
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