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Old 06-01-2010, 02:05 PM   #1
Richard Aldrich
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Do humans feel the difference in carb energy and fat energy?

Curious. My car will run different with different gas octane.
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Old 06-01-2010, 02:16 PM   #2
Jamie J. Skibicki
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Re: Do humans feel the difference in carb energy and fat energy?

Is there a question in here some where? If so could you rephrase it?
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Old 06-01-2010, 02:19 PM   #3
Eric Montgomery
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Re: Do humans feel the difference in carb energy and fat energy?

Depends what intensity level you're working at...i.e. which energy pathway you're using. At low intensities you're fine running off stored bodyfat and free fatty acids. At higher intensity your muscles will burn glycogen as fuel. At max intensity neither carbs nor fat will really help all that much since you'll be running off of ATP. You won't really "feel" a difference as you shift from one source to the other, aside from bonking if you up the intensity when your glycogen levels are already depleted.
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Old 06-01-2010, 03:02 PM   #4
Shane Skowron
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Re: Do humans feel the difference in carb energy and fat energy?

Fat fuels oxidative system. Carbs fuel glycolytic system. For most endurance sports (this includes basically anything that takes more than 30 seconds by the way) you'll need a combination of both.

It's possible to operate for many hours at a very low intensity without any carbs whatsoever.

I'm not sure it's possible to live without any fat whatsoever (they're called essential fatty acids for a reason) so I don't think endurance activity has been tested that way.
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