When does the body begin using stored fat as energy?

[SoreArms]

I always assumed that the body uses glycogen first, then when this source is tapped, it uses stored fat. Today, a guy I work with (ex- competition BB) told me that when glycogen stores are full, the body likes to keep them that way so it will use stored fat as a source of energy before it uses glycogen.

 

[Clean]

bump!

 

[Lumberg]

interesting.

 

[MrMakaveli]

In what state are we talking?

Body uses fat as fuel at rest.

It really is going to depend on what your doing.

If you have glycogen in your muscles and are weight training then obviously the body is going to burn that before fat.

 

[serbyte]

Go to howstuffworks.com and type in fat cells. This will explain everything.

 

[The Red Dragon]

Scientifically speaking if you weight train you'll be using glycogen since heavy lifting use glycolytic fast twitch fibers. You start using fat when you recruit slow twitch oxidative fibers (cardio), or moderate intensity lifting.

 

[anthrax]

Scientifically speaking if you weight train you'll be using glycogen since heavy lifting use glycolytic fast twitch fibers. You start using fat when you recruit slow twitch oxidative fibers (cardio), or moderate intensity lifting.

Right,

It depends on intensity and oxygen consumption (aerobic/anaerobic work)

 

[JKurz1]

One would have to have a serious binge in order to store a 1lb of fat from just ONE day...esp. if you go immidiately back to you low cal the following week...........I don't care if you eat while you sleep for 23 hours on one day..........your body would be re-fueling from the low cals throughout the week..........

 

["PrinceCharming"]

One would have to have a serious binge in order to store a 1lb of fat from just ONE day...esp. if you go immidiately back to you low cal the following week...........I don't care if you eat while you sleep for 23 hours on one day..........your body would be re-fueling from the low cals throughout the week..........

not necissarily. if someones glycogen levels are full. and they eat a half gallon of bryers icecream they could easily put on one pound of fat in a day. because its over 3000 cals in the icecream

 

[JKurz1]

Did you read the post? Low calorie and trains all week all week and feasts on Sunday..........

 

["PrinceCharming"]

I always assumed that the body uses glycogen first, then when this source is tapped, it uses stored fat. Today, a guy I work with (ex- competition BB) told me that when glycogen stores are full, the body likes to keep them that way so it will use stored fat as a source of energy before it uses glycogen.

im sorry jkruz but this is the post..... i didnt know anything about his training schedule

 

[JKurz1]

maybe you should ask him..........

 

[SoreArms]

Current training schedule (soon to change, I start classes next monday)

Cardio 3-4 days per week, HIIT in the mornings

Evenings
Monday- Heavy Legs workout/abs
Tues- Chest/tris/lower back
Wed. - Off
Thurs - Back/bis/abs
Friday - Shoulder/light leg workout (leg presses,calfs)/lower back/aux
Sat/sun - Off (sometimes do more aux and cardio on these days)


Diet-
M-F follow a clsoely monitored 50/30/20 P/F/C, all meals logged and keep track of all macros.
Sat-Sun Don't trakc macros, but I don't pig out either. Mostly eat the same foods, but I have more freedom to mix in shit without the head ache of counting (ex. 3 slices of tomato, couple slices of onion, my moms food, etc.)

But how did we get into my training and diet schedule?

 

[bran987]

Ok.. here's my only question.

If the body uses

1) fat for fuel while at rest..
2) a combo of fat and carbs during moderate exercise... and
3) pure carbs during highly intense exercise..

Why do we lose muscle if we stop weightlifting, even if we still have sufficient protein in our diet?

During the 3 scenarios listed above, I didn't see one where our body was burning protein for energy, as long as we have some carbs or fat for it to use.
?

 

[LeeJunFan]

so you are saying that i will lose more fat by walking than sprinting, how is that?

 

[bran987]

no.. it's something like the percentage of calories used while at rest is mostly fat cals..

I'm trying to find the place I saw the post the first time..

 

[KWKSLVR]

so you are saying that i will lose more fat by walking than sprinting, how is that?

Because walking for a long duration is extremely aerobic. Doing a lot of sprints can lead to an anerobic state (and even if it isn't its not an activity that optimizes fat burning).

 

[BOOEY]

So why do so many people recommend sprinting as a form of cardio that burns the most fat while retaining the most muscle? Not a call-out, but a serious question.

 

[juve]

when no alternative fuel is present for metabolism and VO2max stays relatively low

 

[SoreArms]

Incase you don't know what V02max is (I didn't until I looked it up)

The amount of oxygen your body can process determines how efficiently your body uses carbohydrates, proteins, and fats as energy sources. V02 max is a prediction of maximal oxygen consumption in milliliters of oxygen per kilogram of your body weight per minute (ml/kg/min).

What role does V02 max play in burning fat?

A high V02 max promotes greater fat mobilization and utilization at rest and at stress exercise heart rates. By increasing your V02 max you will be training your body to use fat as its main source of energy instead of glycogen.

 

[juve]

Interesting. Where did you find that. High VO2max is an anaerobic energy metabolisys, which utilizes glucose for fuel, or converts protein to glucose by adding pyruvate which breaks down certain aminoacids (catabolism to compensate for maintenance of ATP)
I would venture to say that high VO2max only promotes increased lypolisys post-excercise, but that is mainly due to an increased metabolic advantage

 

[anthrax]

A high V02 max promotes greater fat mobilization and utilization at rest and at stress exercise heart rates. By increasing your V02 max you will be training your body to use fat as its main source of energy instead of glycogen.
[/i]

First time I read that point

Interesting

where did you get that ?

 

[SoreArms]

I did a google search of "vo2max". I browsed through several sites before i read and quoted this one. It was a site advertising vo2max tests, I'll try to find it again.

 

[SoreArms]

Reading more on Vo2 max I think that they meant the bigger your vo2max capacity, the better your body can utilize stored fat as energy and not exercising at a high vo2max %.

When exercising at a high vo2max% the body will tend to use glycogen first, when glycogen is depleated it will turn to stored fat, however stamina will decrease at this point.

It seems like low to mid vo2max% is otimal for burning stored fat. Is that right?

 

[anthrax]

It seems like low to mid vo2max% is otimal for burning stored fat. Is that right?

Yes, it's right

but at higher vo2max% you burn calories for more time