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When Are Lipids Used As An Energy Source

Question


I know they are, although not as much as carbohydrates are. My textbook doesn't really specify when and why lipids are sometimes used for energy, though.


Read article: Best Source Of Energy For Endurance Athletes And Blood
added by Jennifer Padilla




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Comments

  1. Unperilous
    Unperilous

    Well, Eli wrote a lot of words, but none of them answered your specific question, which is: when are lipids used as an energy source. A major time they are used is in muscle, during endurance exercise, particularly in a trained athletefull oxidation of fatty acids occurs in the mitochondria, which will be very active during say, a marathon run or during a long bicycle road race. Birds will also use them for fuel during long migratory flights. Since you can store more than twice the energy per unit weight of fat compared with the other major fuel, carbohydrate, fat is the perfect source for long, extended bouts of exercise at moderate intensity, and training increases the ability to use it more efficiently, even at fairly high work outputs. But prior training is the keyin an untrained person who suddenly starts doing long distance running, the predominant fuel is carbohydrate, which you quickly run out ofyour brain has an absolute requirement for glucose, so if your muscles grab it all up there's nothing left for the brain and you "hit the wall"you feel faint, and can't go on. There is simply not enough stored carbohydrate to support a long, sustained effort, but there is plenty of stored fat for that, if your system is trained to use it efficiently (and THAT is the essence of what endurance training is for). By training your muscles to use fatyou can draw on the vast stores of energy in your adipose tissue during most of the race for your muscles while the more limited amounts of carbohydrate are saved for the brain's exclusive use. Then, when it's time for the finishing burst of speed at the end of the race, you can then go ahead and use your carbohydrate at the end of the race in your finishing "kick." Training increases the number and efficiency of your muscles' mitochondria, and primes the hormonal system for pulling the fatty acids out of stores for use. Athletes train for a long time in order to be able to maximize use of fats during races, even at very high intensities compared with untrained peoplethat's why you see racers in stages of the Tour de France able to go 120 miles over mountain passes and still able to sprint at the end of the race.

  2. Boilinglike

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