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exercise duration for fat-burning

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There's been some info online recently about testing the common & long held belief that when exercising to burn fat, the exercise duration should be over 20 minutes, as this is the time it takes for the body to start burning fat calories. Its what I learned when younger, & personally what I've always believed & practiced, but would be interested to hear some thoughts on this from you fitness junkies.

dunno.  the one thing you can be sure of is that when you are exercising you are almost always burning up fat, all that differs is the rate at which you are burning it up.  my opinion is  that a moderate exercise routine is the best.

Hi there:

my experience with this is as follows; I think the recommended amount of time for exercising is 20-30 mins per day.  It doesn't matter if you do this all at one time or break it up in 10 mins intervals.  So walk around the office, climb some stairs, desk push ups (lean over, hands on desk and do push ups - strength training), it all counts and all are fat burning.  That's what I've been taught through the University.  The best fat burners are the strength training ones that actually increase muscle and decrease fat.  Aerobic types are for the heart.  A combination of both is the right mix.


All sounds interesting so far.  One consideration in all of this though, is that the body is said to burn up carbohydrate calories during the first twenty minutes of exercise.  So it appears there are varying beliefs on the issue of exercise duration in the fitness/nutrition field.
As for strength training, it is questionable if it contributes to fat-burning, as it is anaerobic, & performed in short bursts of highly intensive energy, with rest intervals in between. Which makes sense, as exercises should be performed to failure, where no more repetions are possible, so that strength is gained through replenishing. Fat-burning on the other hand would require aerobic exercise, where it is moderate & continuous.

some other considerations brought to my attention lately are that the body is more likely to rely on fat calories for energy when:
exercising prior to the day's first meal;
& exercising 2-3 hours after a meal (whereas when exercising one hour after a meal, the body is likely to utilise more carbohydrate calories for energy).

It's a science to be sure, with all little knooks and crannies.



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