Cardio, Carbs and Fat Burning

[BigKen]

Hi Guys

Just a quick question.

I have read that if you work at over 80% MHR then you dont get energy from fat just from carbs.

If i was to have my last serving carbs around 4 1/2 hours or longer before I do cardio will I be burning fat more than carbs? [ie. will all the energy I use to perform cardio come from my fat stores?]

Also use ephedrine and caffeine before the cardio.


What are your opinions?

Peace

 

[abadseal]

Even though a higher percentage of calories comes from fat at lower intensity(60%) with higher intensity cardio you burn a higher total number of calories which means a larger number of calories from fats.

45-minutes 4.0 mph walk- 500 calories (65% fat, 35% glycogen)= 325 calories from fat.



45 minutes high intensity interval sprints-1000 calories (35% fat, 65% glycogen)= 350 calories from fat.

You will burn more overall calories and therefore more calories from fat. I pulled those numbers out of my ass for an example.

 

[BigKen]

I think I understand where you're coming from, but still if my last carb meal is 4 1/2 hours minimum before cardio will I be using more cals from fat or carbs?

Forgot to say earlier I also have 1 L-Carnitine tab in the morning. Supposed to free adipose tissue so it can be metabolised. Not sure how effective, but hopefully make a difference.

Once again, more cals from fat or carbs?

Sorry to keep asking.

Peace

 

[abadseal]

I think it would have more to do with whether your glycogen stores are full or not and again at what intensity level you'll be exercising at. This is why low carb diet + the right cardio = fantastic results. My guess would be you'd be burning an even mix of glycogen/glucose and stored fats. Also I think your last meal has a big part to play with insulin secretion. If you insulin levels are still high during your cardio session then liposis is haulted.

FYI- L-Carnitine doesn't really metabolize fat stores is helps pass fatty acids through the mitochondria of the cells to be burned as fuel. Very big waste of $ if you ask me. Stick with the ephedrine and caffeine.

 

[flexmaster]

I think it would have more to do with whether your glycogen stores are full or not and again at what intensity level you'll be exercising at. This is why low carb diet + the right cardio = fantastic results. My guess would be you'd be burning an even mix of glycogen/glucose and stored fats. Also I think your last meal has a big part to play with insulin secretion. If you insulin levels are still high during your cardio session then liposis is haulted.

FYI- L-Carnitine doesn't really metabolize fat stores is helps pass fatty acids through the mitochondria of the cells to be burned as fuel. Very big waste of $ if you ask me. Stick with the ephedrine and caffeine.

nice advice abadseal! good stuff bro

big ken, abadseal is right on with everything he said. one more thing i want to add is that the duration of the exercise (along with intensity like abadseal said) also determines whether glycogen/glucose or fatty acids will be metabolized for energy. moderate intensity exercise for a long duration of time( 1hr+) will use approximately 50% carbohydrates and 50% fat for energy.