Two Fat Loss Myths
Posted on | September 28, 2009 | No Comments
Two training myths explained today, both dealing with fat loss.
1. Targeted Fat Loss
This is a great one. For men and women it’s getting rid of that extra bit of fat around the midsection to reveal their abs. For women it’s the bit of fat on the underside of their upper arm. Everyone wants to get rid of it, and there a million products/routines/pills that promise to do so. But the fact is, it’s impossible to target fat loss on any part of the body. Fat is deposited around the body without any regard to whether the muscles underneath have been worked. That’s why all those crunches never gave you a six-pack.
2. Aerobic Training is Best For Fat Loss
This one is rooted in actual science, although it’s ultimately just as misguided as myth #1. Aerobic training – low to moderate intensity activity where your heart rate is about 60-75% of your max heart rate (HRM) – burns energy primarily via the oxidative energy pathway (approximately 70%). Put simply, fat molecules are broken down into energy which your muscles use. High intensity exercise on the other hand – sprints, circuit training, or heavy strength training where your heart rate is typically above 75% HRM - burns energy primarily via the glycolytic energy pathway (about 50%). In this case, glucose (sugar) is the primary energy source with fat taking a smaller role. Unthinking trainers and the fitness industry took this physiological fact and prescribed low to moderate intensity exercise – the “fat burning zone.”
BUT, low intensity training however, burns fewer calories. A lot fewer – so an hour on the treadmill might mean 300 burned calories or roughly 220 fat calories, but an hour of circuit training could burn something more like 600 calories! Even though less comes from fat, half of 600 (that’s 300 for those who’ve had their morning coffee) is more than 200 or so. So ditch long duration, low intensity training for the most part. It’s boring and largely ineffective for losing fat.
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