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Question
Posted by: Marc | 2011-03-03

Fat/Glycogen Stores

Hi Doctor

From doing my own research I have found that, when exercising at low/medium intensities, the body uses its fat stores as its primary source of energy. When exercising at higher intensities, the body uses glycogen stored in muscle and the liver as its primary source, that is why athletes in endurance races need to top up their energy every 45min or so, to prevent " hitting the wall" . However, some people say this is not the case, and that glycogen is always the first source of energy, whether at low or high intensities. Could you please settle this, once and for all?

Thanks

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Our expert says:
Expert ImageFitnessDoc

Hi Marc

Glycogen is always the source of energy first, but so is fat. There is no "switch" that suddenly makes you go from one to the other, at any exercise intensity. You always use both, just at different levels depending on the exercise intensity.

Best thing is to read the following article: http://www.sportsscientists.com/2010/01/exercise-and-weight-loss-part-3-fat.html

Good luck

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2
Our users say:
Posted by: fitnessdoc | 2011-03-13

Hi Marc

Glycogen is always the source of energy first, but so is fat. There is no "switch" that suddenly makes you go from one to the other, at any exercise intensity. You always use both, just at different levels depending on the exercise intensity.

Best thing is to read the following article: http://www.sportsscientists.com/2010/01/exercise-and-weight-loss-part-3-fat.html

Good luck

Reply to fitnessdoc
Posted by: PVS | 2011-03-03

GO do research regarding aerobic an anorobit training as you will get your answer there. Its all aboyt oxygen used to for atp &  adp. haha you prob wont understand yet but if you do your own research you will understand much better than someone telling you.

Reply to PVS

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