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Jogging Fights Beer Belly Fat Better Than Weights

Filed by KOSU News in Health.
August 26, 2011

Weight training is touted as the cure for many ills. But if the goal is to lose belly fat, aerobic exercise is the only way to go, exercise scientists say.

We’re not talking about muffin tops, the annoying bit of pudge that rolls over a woman’s waistline and is featured in those strange Internet ads. Rather, this is gut fat lodged around internal organs, which could look like a beer belly from the outisde. It’s considered a risk factor for diabetes, heart disease, and cancer.

Surprisingly little research has been done comparing the health benefits of strength training with weights to aerobic exercise such as walking. But that’s just what researchers at Duke University did.

They compared changes in visceral fat – the fat that wraps around internal organs – in people who did strength training compared to a group who did aerobic exercise. They divided 198 overweight, sedentary adults into groups, with one group working out with weights three times a week for eight months. A second group jogged 12 miles a week.

The aerobic exercisers lost significant amounts of visceral fat, as well as fat around the liver. They also lost abdominal fat overall, and had improvements in liver enzymes and insulin resistance. By contrast, the people who were pumping iron lost a wee bit of subcutaneous fat, but their stats otherwise didn’t improve. The aerobic training burned 67 percent more calories than resistance training. The results were published in the American Journal of Physiology.

“Resistance training is a very good way to increase lean muscle,” Cris Slentz, an exercise physiologist at Duke who led the study, told Shots. “And aerobic exercise isn’t.” But if the goal is to lose fat, then aerobic exercise is the ticket, he said.

There’s no easy way to know how much visceral fat a person has; the researchers had to put people in CT scans to measure it. But one good clue is a beer belly — that distinctive shape is caused by visceral fat. Men tend to carry more visceral fat than women, Slentz says, and white people tend to have more visceral fat than African Americans. And older people tend to internalize fat, while younger people carry fat right beneath their dewy skin. [Copyright 2011 National Public Radio]

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