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Brokensword
09-22-2004, 10:36 PM
I've read, and been told that low intensity aerobic workouts burn fat much more easily and start to burn it earlier than higher intensity aerobic or anaerobic exercise. Higher intensity stuff tends to seek carbs and calories as a source of energy before it looks into fat. So would it make any sense at all whatsoever to do high intensity aerobic exercise? i mean, the goal is to burn fat and keep sufficient calories in your body to build, or at least maintain muscle mass. So during cutting, keeping the carbs for energy for working out and the calories for muscle growth or maintenence as a goal would be better achieved through low intensity or light aerobic activity would it not?

GMCtrk
09-22-2004, 10:52 PM
there's no truth to that. Fats have a higher energy, therefore they are harder to burn. Carbs and protein will always be used as energy sources first.

Brokensword
09-22-2004, 11:01 PM
So you basically have to lose some muscle mass when going on a cut? I have to go on a cut because I can barely fit into my pants anymore. I'm afraid of losing most of my muscle mass that I gained on this bulk, which doesn't look like much. I've made gains at the gym and in weight but I don't look too much bigger, except around the belly and lovehandles. If my muscles grew anywhere near as fast as they did I'de be friggin huge. I just don't want all my work at the gym to go down the toilet because I had to cut down my fat.

Aspect
09-23-2004, 06:18 AM
It's not quite that simple.

Your body always burns fat and carbs at the same time. The ratio of the two varies depending on how hard you exercise (the harder you exercise, the higher the proportion of carbs it burns).

The theory you're talking about is obviously flawed as soon as you think about it. If low-intensity exercise were better at burning fat than high-intensity exercise, then surely complete rest would be better still (that burns an even higher ratio of fat to carbs)? So all the couch potatoes would be lean and well defined.

High-intensity exercise may burn a lower proportion of fat, but it burns more calories overall. Half an hour of walking may burn (for example) 200 calories, of which 100 may come from fat and 100 from carbs. Half an hour running may burn 400 calories, of which 150 may be fat and 250 carbs. The walking burned a better ratio of fat to carbs, but the running burned more fat overall. Add on to that the fact that your metabolism is raised after your run (burning more calories) and it's clear that higher intensity is, in general, better than low intensity. As for "keeping the carbs" for building muscle, again it's not that simple - the high intensity exercise will improve your body's ability to burn fat, and to store glycogen. And replacing lost glycogen stores is relatively simple with a decent diet.

One of the most efficient ways of exercising for fat loss is HIIT (High Intensity Interval Training) - there are loads of posts on these forums about it, or read some of the following links:

http://www.youronlinefitness.com/Fi...al_training.htm
http://www.exrx.net/FatLoss/HIITvsET.html
http://www.musclemedia.com/training/hiit.asp
http://davedraper.com/interval-cardio-description.html
http://www.wsu.edu/~strength/hiit.htm
http://www.bulknutrition.com/?articleID=30&break=3
http://www.dolfzine.com/page483.htm
http://www.bodybuilding.com/fun/satter2.htm
http://www.trainforstrength.com/Endurance1.shtml

As for cutting, the best way to maintain muscle mass is to lose weight slowly, make sure you still eat enough protein, and continue weight training. Careful monitoring of your diet is the most important point.

waynis
09-23-2004, 11:44 AM
High intensity aerobic training will burn and give you the best results. You use carbs to begin with but once your going past 5 minutes or so you will mostly use fat as your fuel.

Brokensword
09-23-2004, 05:16 PM
I'm trying the HIIT thing now as I start my slow cut. I think that maybe this is the best approach. I guess it covers all the bases.