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[NavigationHazard]

(snip) If you burn 6000 calories a day, you can still eat 2500 calories and lose a pound of fat.
(snip)

No you can't. Even at moderate, so-called "fat burning" exercise intensities, a good deal of the necessary energy is going to come from carbohydrates. Here's a graph from a 2001 study of intensity's relation to energy source:



Plasma FFA in the graph refers to "free fatty acids," i.e. fat bound with blood-plasma protein albumin.

At a steady-state 55% of maximum workload these subjects were deriving maybe half of the necessary energy from fat burning and half from carbohydrates. I think there's evidence out there suggesting that the percentage derived from fat maxes out at about 60% at around 65% of maximum workload. Even this leaves ~40% coming from carbohydrates.

At a 60/40 fat/carbohydrate ratio, to burn the 3500 calories that is the equivalent of 1 pound of fat will require a net exercise expenditure of 5833 calories. At 50/50 it's a whopping 7000 calories.

[NavigationHazard]

(snip)
This morning, 90min erg, 142min bike.
(snip)

(snip)
I burned about 6000 calories this morning in my erging and biking. (snip)

Not in 232 minutes you didn't. That's an average rate of ~1552 calories/hour. To get the monitor to display that on an erg you'd need to row at 1:38.7 pace. You did NOT row 27,356m in 90 minutes, breaking the age-group WR for 2k 13 2/3 times in a row on zero rest. Neither did you climb off and then ride a stationary bike at the same 1552 cal/hr intensity (claimed to be UT2) for another two hours and twenty-two minutes. On the road, an average 155-lb cyclist should expect to burn something like 760 calories/hour at 20 mph on flat ground with no complicating wind.

[chgoss]

(snip) If you burn 6000 calories a day, you can still eat 2500 calories and lose a pound of fat.
(snip)

No you can't.
<snipped out the scientific evidence backing up that statement>

not to mention that a human simply can not operate on a caloric deficit like that day after day (without severely crippling performance ability)... perhaps a day or 2, but not a week.

[ranger]

(snip) If you burn 6000 calories a day, you can still eat 2500 calories and lose a pound of fat.
(snip)

No you can't. Even at moderate, so-called "fat burning" exercise intensities, a good deal of the necessary energy is going to come from carbohydrates. Here's a graph from a 2001 study of intensity's relation to energy source:



Plasma FFA in the graph refers to "free fatty acids," i.e. fat bound with blood-plasma protein albumin.

At a steady-state 55% of maximum workload these subjects were deriving maybe half of the necessary energy from fat burning and half from carbohydrates. I think there's evidence out there suggesting that the percentage derived from fat maxes out at about 60% at around 65% of maximum workload. Even this leaves ~40% coming from carbohydrates.

At a 60/40 fat/carbohydrate ratio, to burn the 3500 calories that is the equivalent of 1 pound of fat will require a net exercise expenditure of 5833 calories. At 50/50 it's a whopping 7000 calories.

Well, you might add my basal metabolism in there, too, which would be about 1600 calories.

So, let's say I burned 4000 calories, 60% being fat, in my exercise, which makes 2400 calories from fat, and then a similar proportion of fat in my basal metabolism, which would add 960 calories. The total would be 3360 fat calories burned, pretty close to a pound. I am also active in other ways; I don't just sit around all day. These expenditures would also have to be added to the sum, making the total well over a pound of fat burned each day, if I watch what I eat and avoid fats almost entirely. For instance, I have just been out shoveling snow for an hour. Yesterday, I walked several miles all over campus getting tasks done in preparation for next semester.

The remaining 40% of the calories comes out to be almost exactly 2500, as I claimed, and I eat these back largely with carbohydrates.

Anyway, the proof is in the pudding, not the calculations, which are entirely hypothetical and unconstrained by fact.

Truth is: Doing what I am doing, eating as I am eating, I lose about a pound of fat a day.

I'll post a shot of my Tanita scale with my weight at 160 lbs. early next week.

ranger

[ranger]

(snip)
This morning, 90min erg, 142min bike.
(snip)

(snip)
I burned about 6000 calories this morning in my erging and biking. (snip)

Not in 232 minutes you didn't. That's an average rate of ~1552 calories/hour. To get the monitor to display that on an erg you'd need to row at 1:38.7 pace. You did NOT row 27,356m in 90 minutes, breaking the age-group WR for 2k 13 2/3 times in a row on zero rest. Neither did you climb off and then ride a stationary bike at the same 1552 cal/hr intensity (claimed to be UT2) for another two hours and twenty-two minutes. On the road, an average 155-lb cyclist should expect to burn something like 760 calories/hour at 20 mph on flat ground with no complicating wind.

O.K.

Not just in my erging and biking, but in my erging and biking, plus my basal metabolism, plus all of the other things I do physically in a normal day.

ranger

[ranger]

[removed]

[ranger]

BTW, most of the time, I think I burn about 1000 calories an hour on my bike.

I ride on high gear.

And I usually go somewhat faster than 20 mph.

And I am not 155 lbs.

I am 166 lbs.

As I mentioned at one pount, I tried cycling on a machine in a gym at the resistance and speed that I ride at and the machine said I was doing 900 cal/hour. The bicycle was reclining, which I didn't like, so I couldn't work as hard.

ranger

[ranger]

The weight loss I am getting is clearly a combination of exercise and diet.

If I ate like this from day to day, I would lose fat, too, albeit much more slowly.

I usually don't avoid all meats, dairy, fats, and processed sugars and just eat fruits, vegetables, grains, and legumes.

But when I want to lose weight fast, I combine _enormous_ bouts of exercise with a minimal, fat-free diet.

Works like a charm.

Weight loss is a no-brainer.

Calories in, calories out.

ranger

[chgoss]

BTW, most of the time, I think I burn about 1000 calories an hour on my bike.

FYI, there's no need to guess at this kind of information, just check your cycle computer, it has the exact number you burned this morning.

that is, if you want to know it...

[ranger]

BTW, most of the time, I think I burn about 1000 calories an hour on my bike.

FYI, there's no need to guess at this kind of information, just check your cycle computer, it has the exact number you burned this morning.

that is, if you want to know it...

My cycle computer doesn't count calories.

ranger

[chgoss]

BTW, most of the time, I think I burn about 1000 calories an hour on my bike.

FYI, there's no need to guess at this kind of information, just check your cycle computer, it has the exact number you burned this morning.

that is, if you want to know it...

My cycle computer doesn't count calories.

ranger

what make/model cycle computer do you have?

[ranger]

FYI, there's no need to guess at this kind of information, just check your cycle computer, it has the exact number you burned this morning.

that is, if you want to know it...

My cycle computer doesn't count calories.

ranger

what make/model cycle computer do you have?

Minimal!

Delphi 3.0

ranger

[chgoss]

My cycle computer doesn't count calories.

what make/model cycle computer do you have?

Delphi 3.0

Here ya go,
The Blackburn Delphi 3.0 bike computer offers cadence data in addition to a full selection of basic speed and distance data. Functions include trip and total distance, current, average and max speed, 20 lap cronograph, 2 bike settings, current, average and max cadence. Wired speed/distance and cadence data transmission. Lifetime warranty.

http://www.ehow.com/about_5417938_calor ... cycle.html
MPH/Calories Burned Per Mile
10/26
15/31
20/38
25/47
30/59


142 minutes on bike @ 20mph = 47.33 miles
47.33 miles x 38calories/mile = 1800 calories total expended on the bike this morning

[chgoss]

what make/model cycle computer do you have?

Delphi 3.0

Here ya go,
The Blackburn Delphi 3.0 bike computer offers cadence data in addition to a full selection of basic speed and distance data. Functions include trip and total distance, current, average and max speed, 20 lap cronograph, 2 bike settings, current, average and max cadence. Wired speed/distance and cadence data transmission. Lifetime warranty.

http://www.ehow.com/about_5417938_calor ... cycle.html
MPH/Calories Burned Per Mile
10/26
15/31
20/38
25/47
30/59


142 minutes on bike @ 20mph = 47.33 miles
47.33 miles x 38calories/mile = 1800 calories total expended on the bike this morning

Quick calculation of calories on the erg, using 90min at a average pace of 1:50 would result in ~2100 calories.

2100 calories on 90 min erg
1800 calories on 142 min bike
3900 total calories for you this morning.


using this calorie counter, looks like you are burning around 2100 calories per day, given your age/weight/height/daily activities other than excercise already counted
http://walking.about.com/cs/calories/l/blcalcalc.htm

giving you a grand total of 6000 calories expended per day.

[chgoss]

(snip)
This morning, 90min erg, 142min bike.
(snip)

(snip)
I burned about 6000 calories this morning in my erging and biking. (snip)

Not in 232 minutes you didn't. That's an average rate of ~1552 calories/hour. To get the monitor to display that on an erg you'd need to row at 1:38.7 pace. You did NOT row 27,356m in 90 minutes, breaking the age-group WR for 2k 13 2/3 times in a row on zero rest. Neither did you climb off and then ride a stationary bike at the same 1552 cal/hr intensity (claimed to be UT2) for another two hours and twenty-two minutes. On the road, an average 155-lb cyclist should expect to burn something like 760 calories/hour at 20 mph on flat ground with no complicating wind.

O.K.

Not just in my erging and biking, but in my erging and biking, plus my basal metabolism, plus all of the other things I do physically in a normal day.

ranger

that turns out to be a (albeit coerced) true statement.. I'll keep track of it!!