The New York Times' Well blog reports that 'for some time, researchers have been finding that people who exercise don't necessarily lose weight.' A study published online in September 2009 in The British Journal of Sports Medicine was the latest to report apparently disappointing slimming results. In the study, 58 obese people completed 12 weeks of supervised aerobic training without changing their diets. The group lost an average of a little more than seven pounds, and many lost barely half that. It also shows that the 'after burn' effect of exercise or the believe that we burn calories well after exercise seems to be a myth.
here is a link to this article:
http://well.blogs.nytimes.com/2009/1...o-weight-loss/
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11-09-2009, 01:43 AM #1
New study shows fat "after burn" after exercise is a myth
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11-09-2009, 01:52 AM #2
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11-09-2009, 02:37 AM #3
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1) So they lost 7 pounds in 12 weeks, and that concludes that exercise doesn't burn calories?
2) Where is the control group?
3) Why is nobody keeping track of calories eaten?
4) Why is nobody lifting weights in this study?
5) Even if you burn a higher "percentage" of calories from fat loss, you would burn more calories, and even more calories from fat, if you worked out harder.1
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11-09-2009, 02:50 AM #4
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11-09-2009, 03:14 AM #5
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11-09-2009, 03:50 AM #6
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11-09-2009, 03:58 AM #7
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Each of Melanson?s subjects spent 24 quiet hours in the calorimeter, followed later by another 24 hours that included an hourlong bout of stationary bicycling. The cycling was deliberately performed at a relatively easy intensity (about 55 percent of each person?s predetermined aerobic capacity). It is well known physiologically that, while high-intensity exercise demands mostly carbohydrate calories (since carbohydrates can quickly reach the bloodstream and, from there, laboring muscles), low-intensity exercise prompts the body to burn at least some stored fat. All of the subjects ate three meals a day.
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.
They took one small fraction of the types of exercise that people do, and came to an overall conclusion. All they proved was that cycling at half speed doesn't burn more fat afterward. It doesn't even say that cycling at half speed didn't burn more total calories afterward.1
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11-09-2009, 04:02 AM #8
This is aerobic exercise only. Of course there's no afterburn, your energy requirements during the activity were met. Once your heart rate comes down, that's it. You would only expect significant afterburn in anaerobic exercise, where your body must continue working after the fact to deal with all that lactic acid that was built up. I have no idea how much energy this requires , maybe it's not much (it's certainly not huge), but it wasn't addressed in this aerobic study at all.
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11-09-2009, 04:04 AM #9
This is aerobic exercise only. Of course there's no afterburn, your energy requirements during the activity were met. Once your heart rate comes down, that's it. You would only expect significant afterburn in anaerobic exercise, where your body must continue working after the fact to deal with all that lactic acid that was built up (essentially you're working on an oxygen deficit that you have to pay back after the fact). I have no idea how much energy this requires, maybe it's not much (and I don't think it's huge), but it wasn't addressed in this aerobic study at all.
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11-09-2009, 04:56 AM #10
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11-09-2009, 05:23 AM #11
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11-09-2009, 06:24 AM #12
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11-09-2009, 06:31 AM #13
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11-09-2009, 07:18 AM #14
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I don't see how these results specifically attack the notion of after burn.
Again, their caloric intake was never monitored...all it said was that nothing changed in the diet. If they were already eating a 500 Cal per day surplus...then the exercise would be barely able to help them maintain.Mark these words in the annals (no homo) of bodybuilding.com.
8===D~~~ (.Y.)
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11-09-2009, 09:08 AM #15
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11-09-2009, 10:15 AM #16
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11-09-2009, 10:21 AM #17
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11-09-2009, 10:57 AM #18
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11-09-2009, 11:00 AM #19
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11-09-2009, 01:02 PM #20
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11-09-2009, 01:38 PM #21
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