Sport Energy intake required to maintain a steady bodyweight

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Is there a formula you can use to estimate the energy intake required to maintain a particular bodyweight value?

For instance, once I reached 72kg, and assuming I stopped training, how do I estimate the amount of kilojoules (or calories) I must consume each day to maintain that weight?

Also, how does the formula change if I want to keep that level of bodyweight as minimum, but I continued training?

Finally, is there a way to figure out how each type of training (weight lifting, running, sprinting, plyometrics, etc.) affects the energy intake required to maintain a steady bodyweight?
 
I think what you are looking for is called BMR (Base Metabolism Rate). There are a number of web sites with calculators which estimate BMR, and also estimate the calories burned by different exercise types. Notice I said "ESTIMATE". BMR varies between individuals and in the same individual over time. Your body tends to change your BMR in an attempt to maintian the status quo, which is why most individuals eventually hit plateaus. Also, most estimates of calories burned by exercise types only are talking about the calories burned while performing the exercise. More important is the increased number of calories burned after the execise verses what would have been burned over the following period (up to 48 hours) if no exercise was performed (sometimes referred to EPOC, Excess Postexercise Oxygen Consumption). And this varies by the intensity and volume of the exercise performed and the hormonal stimulis it provides.
 
No. BMR is the required energy intake to maintain body weight at rest as if you we're sleeping or in a coma. What you want is your daily caloric needs.

You must multiply your BMR with an activity level.

English BMR Formula
Women: BMR = 655 + ( 4.35 x weight in pounds ) + ( 4.7 x height in inches ) - ( 4.7 x age in years )
Men: BMR = 66 + ( 6.23 x weight in pounds ) + ( 12.7 x height in inches ) - ( 6.8 x age in year )

Metric BMR Formula
Women: BMR = 655 + ( 9.6 x weight in kilos ) + ( 1.8 x height in cm ) - ( 4.7 x age in years )
Men: BMR = 66 + ( 13.7 x weight in kilos ) + ( 5 x height in cm ) - ( 6.8 x age in years )

To determine your total daily calorie needs, multiply your BMR by the appropriate activity factor, as follows:

1. If you are sedentary (little or no exercise) : Calorie-Calculation = BMR x 1.2
2. If you are lightly active (light exercise/sports 1-3 days/week) : Calorie-Calculation = BMR x 1.375
3. If you are moderatetely active (moderate exercise/sports 3-5 days/week) : Calorie-Calculation = BMR x 1.55
4. If you are very active (hard exercise/sports 6-7 days a week) : Calorie-Calculation = BMR x 1.725
5. If you are extra active (very hard exercise/sports & physical job or 2x training) : Calorie-Calculation = BMR x 1.9

You must also consider a proper macro-nutrient ratio to maintain an ideal body weight. Simply relying on calories isn't accurate enough.

Macro nutrients are proteins/carbs/fats.
 
Your body tends to change your BMR in an attempt to maintian the status quo, which is why most individuals eventually hit plateaus
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No, the reason behind this is that people don't recalculate their BMRs and daily caloric requirements on an appropriate basis. That or they stay on the same workouts for months at a time.

If you use your calculations for 6 months, it's kind of pointless - in general, recalculate your requirements each month and readjust your intake on the new calculations.

Finally, is there a way to figure out how each type of training (weight lifting, running, sprinting, plyometrics, etc.) affects the energy intake required to maintain a steady bodyweight?
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There are computer applications and spreadsheets you can get all over the net for this. I'm not sure, but I bought fitday and I think they have a huge database of nutritional data and exercise data.

Also, how does the formula change if I want to keep that level of bodyweight as minimum, but I continued training?
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It will always be a general approximation for your intake, but in general, it only changes with your level of activity.

If you really want to be accurate, use your BMR and find out what each of your activities requires in terms of energy and nutrients then add it to your BMR - this is the best method, IMO, if you are extremely serious.

A great example of what I'm talking about is P90X, you would get killer info on all your questions if you looked that up.

They change your nutrition and workouts regularly as you progress in the program, they keep your entire body guessing and working throughout the entire process to make it so you never hit plateaus.

The key when working out in the long term is to always make it a priority to fight against adaption. You don't want your body to get used to it because if it does, there will be lack of adaptation. Adaption = progress.
 
Thanks guys, good information exactly what I'm looking for. Cheers.
 
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