But, research published in the British Journal of Sports Medicine, suggests an intensive session of exercise is actually not what you need. Turns out, less exercise is in fact more.
In search of Fat Max
The study assessed “fat” burning in a bunch of 12 year old boys. 17 of the boys were obese, the remainder, 12 in total, were lean mean cycling machines.
The boys were strapped onto cycling machines which could ratchet up the level of exertion at regular intervals. So every 3.5 minutes, the wheels went a little faster – the point of the “exercise” was to ascertain at what point “fat” burning was maximal.
Determining the “Fat Max” is based on calculating the amount of oxygen breathed in, versus the amount of carbon dioxide breathed out per minute i.e. VO2 peak.
Fat max lower in fat teens
The VO2 peak varied between individuals, but there was a clear pattern.
Skinny boys VO2 increased steadily, as the intensity of the exercise increased. It peaked between 50 – 60 % and then levelled off, remaining within this range.
Fat boys also saw the VO2 increase, but peak levels were reached at a much lower level of exercise, the peak value was 30 %. As the level of exercise increased – “fat” burning dropped sharply, so by the time the fat boys were doing intensive exercise, they were running on fumes, not fat.
Of course, if you’re running on fumes – you’re effectively running on empty, so you’re a hair and a freckle off “death”. Okay, it is a bit of an exaggeration, but you feel pretty close to death and certainly not in the mood to continue exercising.
Shoddy muscles not up to the task
The break down in performance, more than likely reflects the state of the muscles.
The muscle fibres which dominate in obese individuals are “fast twitch” fibres, also known as type 2 fibres. Fast twitch fibres primarily run on carbohydrate, not fat, so the out of shape muscles can’t mobilize the “fat” to burn it, hitting “the wall”.
The superfit also sometimes “hit the wall”, but this usually happens after prolonged exertion, not a relatively short exercise session in a lab.
The catch twenty two
- To burn fat, you should exercise.
- To burn fat when you’re exercising, you need muscle. But obesity has a tendency to produce BIG wimps, because insulin resistance, the metabolic problem that causes you to pack on the pounds in the first place, deprives muscles of food.
- Exercising without muscle is really hard and doesn’t really burn fat.
Strive to build that muscle
For the uninitiated – exercise is exercise, but for the exercise buff, exercise does different things, depending on the type of exercise.
- Building muscle requires “resistance” training.
- Burning fat requires “aerobic” exercise.
In resistance training you focus on “hurting” the muscle enough to cause the body to respond by patching it up. This is the exercise you want to focus on if you’re struggling with your weight, because it “builds that much needed muscle”.
Feeling the burn a pipe dream ?
Aerobic exercise requires you to huff and puff and pull finger, so that you burn lots of calories.
This is the type of exercise the weight loss gurus often punt as a way to tip the weight fomula so that
Energy in < Energy out
But it is a much tougher option and often leads to disappointment for those trying to exploit this strategy to melt away the pounds. Because in the obese, the body chemistry is wired to store fat, not burn it.
Think muscle not fat
You should exercise, the ideal exercise routine should include both aerobic exercise to get the blood moving so that you charge the heart battery up and resistance training to build muscle.
When you exercise you might find it beneficial to adjust your expectation. The small change in perspective will increase the odds that you will stick with the programme and ultimately reap the benefits.
So when you’re sweating up a storm, think muscle building rather than fat burning. Thinking this way means you stop when your muscles have had enough, not when you can’t breathe and your heart feels like it will explode out of your chest. Remember, by the time you’ve reach this point, you’re probably not burning much fat anyway !
Increase energy out through muscle power
Building muscle is easier than burning fat and more muscle will mean you’re burning more fat even when you’re watching TV.Comparison of fat oxidation during exercise in lean and obese pubertal boys: clinical implications. Br J Sports Med (2009) 43:869-870. G Zunquin, D Theunynck, B Sesboüé, P Arhan, D Bouglé
Interested in learning more about the chemistry behind exercise ?
Subcribe to E-spoons, to get e-mail updates once a month to learn how to keep your body chemistry balanced so you can burn off the extra fat.
NOTE : Privacy & spam policy. Spoonful of Science will not rent, trade or sell the e-mail list to anyone. You can unsubscribe at any time by following the unsubscribe link.
|To give your baby-2-be a strong heart enrol them in an exercise class||Eating protein saves your muscles while the fat cells burn||Don’t just sit there – hop up every so often and do something|
The 7 Big Spoons™…. are master switches that turn health on.
|Balance Eicosanoids||Rein in insulin||Dial down stress||Sleep !||Increase Vit D||Culivate microflora||Think champion|
Did you learn something new or do you have a different perspective ? I’d love to hear from you so post me a comment below