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The myth of the fat-burning "afterburn"
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Med Tent Man
Nov 4, 09 4:41
Post #1 of 15 (952 views)
The myth of the fat-burning "afterburn"
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New study shows no afterburn from moderate (55% of capacity) cycling for an hour.
Quote:
To their surprise, the researchers found that none of the groups, including the athletes, experienced “afterburn.” They did not use additional body fat on the day when they exercised. In fact, most of the subjects burned slightly less fat over the 24-hour study period when they exercised than when they did not.
http://well.blogs.nytimes.com/...lead-to-weight-loss/
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Ken Lehner
"We are on our last bag of Life" - the wife
flying wombat
Nov 4, 09 5:58
Post #2 of 15 (814 views)
Re: The myth of the fat-burning "afterburn" [Med Tent Man]
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Ken, I am not surprised at the results, you wouldnt expect any EPOC following exercise at a relatively slow percentage of VO2 max (if thats how they measured the intensity).
I believe EPOC occurs at higher levels of intensity, although if my memory serves me correctly levels are not enough to account for any significant weight loss. I am not in a location where I can track down the studies.
Kevin
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RebeccaCreekKid
Nov 4, 09 6:27
Post #3 of 15 (738 views)
Re: The myth of the fat-burning "afterburn" [Med Tent Man]
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Afterburn? Really?
My 'junk-science' radar goes all wonky when 'studies' use incorrect and imprecise terminology solely to garner attention.
"Rock it old school and embrace the suck."
Med Tent Man
Nov 4, 09 6:39
Post #4 of 15 (702 views)
Re: The myth of the fat-burning "afterburn" [RebeccaCreekKid]
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Afterburn? Really?
My 'junk-science' radar goes all wonky when 'studies' use incorrect and imprecise terminology solely to garner attention.
The study doesn't use that word. The article in a mainstream newspaper uses that word. The article may be junk science, but it's supposed to be journalism, not peer-reviewed research. Did you look at the study?
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Ken Lehner
"We are on our last bag of Life" - the wife
Andrew V
Nov 4, 09 6:49
Post #5 of 15 (666 views)
Re: The myth of the fat-burning "afterburn" [Med Tent Man]
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New study shows no afterburn from moderate (55% of capacity) cycling for an hour.
No surprise. 55% of aerobic capacity is 'moderate'? If you put aerobic capacity/vO2Max at approx 120% of FTP, 55% of that is 66% of FTP. That's well below ironman bike pace. For TSS people, that's 44 TSS/hr, which is well below the 'moderate' range, and into the 'waste of time' range.
The 'afterburn' effect has long been known as a side-effect of high intensity training. Google HIIT to see where it actually has an effect.
MarkyV
Nov 4, 09 6:52
Post #6 of 15 (649 views)
Re: The myth of the fat-burning "afterburn" [Med Tent Man]
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so um.... when you turn the engine off it still doesnt continue to burn fuel???
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Med Tent Man
Nov 4, 09 6:55
Post #7 of 15 (636 views)
Re: The myth of the fat-burning "afterburn" [Andrew V]
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New study shows no afterburn from moderate (55% of capacity) cycling for an hour.
No surprise. 55% of aerobic capacity is 'moderate'? If you put aerobic capacity/vO2Max at approx 120% of FTP, 55% of that is 66% of FTP. That's well below ironman bike pace. For TSS people, that's 44 TSS/hr, which is well below the 'moderate' range, and into the 'waste of time' range.
The 'afterburn' effect has long been known as a side-effect of high intensity training. Google HIIT to see where it actually has an effect.
It looks like they went on the observation that low-intensity exercise (such as this) burns fat predominantly. They wanted to see if such fat-burning continued past the exercise, and it didn't. Perhaps that's a useless observation for those who do HIIT, but most people do not.
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Ken Lehner
"We are on our last bag of Life" - the wife
JasoninHalifax
Nov 4, 09 6:56
Post #8 of 15 (629 views)
Re: The myth of the fat-burning "afterburn" [Med Tent Man]
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55% is basically walking around the mall for an hour, these results are hardly surprising.
I haven't read the actual research, but if those quotes from the scientists about fat utilization are accurately conveyed by the paper, then that's a big red flag right there.
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tmiles
Nov 4, 09 6:57
Post #9 of 15 (623 views)
Re: The myth of the fat-burning "afterburn" [Med Tent Man]
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Isn't one of the take aways from the study that if you consume calories to replace those that you burn during a workout, that you do not have to draw down on your fat reserves as fuel?
sdmike
Nov 4, 09 7:17
Post #10 of 15 (578 views)
Re: The myth of the fat-burning "afterburn" [MarkyV]
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so um.... when you turn the engine off it still doesnt continue to burn fuel???
Well, the engine is still hot, so fuel is used vaporisly.
Andrew V
Nov 4, 09 7:31
Post #11 of 15 (537 views)
Re: The myth of the fat-burning "afterburn" [Med Tent Man]
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It looks like they went on the observation that low-intensity exercise (such as this) burns fat predominantly. They wanted to see if such fat-burning continued past the exercise, and it didn't. Perhaps that's a useless observation for those who do HIIT, but most people do not.
Good point. I always hated how people in 'fitness' exaggerate the fact that slow exercise burns fat. It puts a pretty serious misconception in peoples minds - that slow stuff is better for weight loss, which is not at all correct.
swift
Nov 4, 09 7:42
Post #12 of 15 (506 views)
Re: The myth of the fat-burning "afterburn" [Andrew V]
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Exactly, you don't stop burning fat when you reach x RER like most people think. The percentage of fat utilization is down but that's a relative number. if you're buring 200 cal an hour and fat is 50% of your substrate utilization that's still less than if you're burning 2000 cal an hour and 10% is coming from fat. I think to see an adequate post exercise fat utilization you would have to elicit an intensity well above 55% VO2max. Off the top of my head I think most studies looking at post exercise substrate utilization go at least 70% VO2max which is enough to induce a good output in GH which aids in FFA mobilization.
Did that make any sense or am I rambling?
-Jason
I believe cars are the new second hand smoke. -Dave Zabriskie
swift
Nov 4, 09 7:47
Post #13 of 15 (484 views)
Re: The myth of the fat-burning "afterburn" [swift]
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also here's a link to an article by GOTO, et al in JAP that looks at post exercise substrate usage
GOTO, 2007
-Jason
I believe cars are the new second hand smoke. -Dave Zabriskie
jaretj
Nov 4, 09 8:17
Post #14 of 15 (418 views)
Re: The myth of the fat-burning "afterburn" [Med Tent Man]
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I don't agree with this
"People “are only burning 200 or 300 calories” in a typical 30-minute exercise session, Melanson points out. “You replace that with one bottle of Gatorade.”"
That must be one heck of a bottle of gatorade to drink over 30 minutes.
50 cal for 8 oz would be 32 to 48 oz. I'd be peeing all day after that.
jaretj
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tigermilk
Nov 4, 09 8:42
Post #15 of 15 (351 views)
Re: The myth of the fat-burning "afterburn" [MarkyV]
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so um.... when you turn the engine off it still doesnt continue to burn fuel???
;-)
Turning the "human engine" off is death. In that case you don't burn more fuel. But This is more like putting an engine in idle. Still burns fuel.
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