Great Article: 7 Biggest Muscle Myths

Fitness Fact vs. Fiction

The guy lifting beside you looks like he should write the book on muscle. Talks like it, too. He's worked out since the seventh grade, he played D-1 football, and he's big. But that doesn't mean he knows what he's talking about. Starting now, ignore him.

The gym is infested with bad information. Lies that start with well-intentioned gym teachers trickle down to students who become coaches, trainers, or know-it-all gym-rat preachers. Lies morph into myths that endure because we don't ask questions, for fear of looking stupid.

Scientists, on the other hand, gladly look stupid--that's why they're so darn smart. Plus, they have cool human-performance laboratories where they can prove or disprove theories and myths. Here's what top exercise scientists and expert trainers have to say about the crap that's passed around in gyms. Listen up and learn. Then go ahead, question it.

Myth #1:
Lifting incredibly slowly builds incredibly big muscles.

Lifting super slowly produces superlong workouts--and that's it. University of Alabama researchers recently studied two groups of lifters doing a 29-minute workout. One group performed exercises using a 5-second up phase and a 10-second down phase, the other a more traditional approach of 1 second up and 1 second down. The faster group burned 71 percent more calories and lifted 250 percent more weight than the superslow lifters.

Myth #2
If you eat more protein, you'll build more muscle.

To a point, sure. But put down the shake for a sec. Protein promotes the muscle-building process, called protein synthesis, "but you don't need exorbitant amounts to do this," says John Ivy, Ph.D., coauthor of Nutrient Timing. If you're working out hard, consuming more than 0.9 to 1.25 grams of protein per pound of body weight is a waste. Excess protein breaks down into amino acids and nitrogen, which are either excreted or converted into carbohydrates and stored.

Myth #3
Leg extensions are safer for your knees than squats.

And cotton swabs are dangerous when you push them too far into your ears. It's a matter of knowing what you're doing. A recent study in Medicine & Science in Sports & Exercise found that "open-chain" exercises--those in which a single joint is activated, such as the leg extension--are potentially more dangerous than closed-chain moves--those that engage multiple joints, such as the squat and the leg press. The study found that leg extensions activate your quadriceps muscles slightly independently of each other, and just a 5-millisecond difference in activation causes uneven compression between the patella (kneecap) and thighbone, says Anki Stensdotter, the lead study author.

Myth #4
Never exercise a sore muscle.

Before you skip that workout, determine how sore you really are. "If your muscle is sore to the touch or the soreness limits your range of motion, it's best that you give the muscle at least another day of rest," says Alan Mikesky, Ph.D., director of the human performance and biomechanics laboratory at Indiana University?Purdue University at Indianapolis. In less severe instances, an "active rest" involving light aerobic activity and stretching, and even light lifting, can help alleviate some of the soreness. "Light activity stimulates bloodflow through the muscles, which removes waste products to help in the repair process," says David Docherty, Ph.D., a professor of exercise science at the University of Victoria in Canada.

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