7 Muscle Myths

Fact vs. Faction
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.

The real expert says: "The best increases in strength are achieved by doing the up phase as rapidly as possible," says Gary Hunter, Ph.D., C.S.C.S., the lead study author. "Lower the weight more slowly and under control." There's greater potential for growth during the lowering phase, and when you lower with control, there's less chance of injury.

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.

The real expert says: More important is when you consume protein, and that you have the right balance of carbohydrates with it. Have a postworkout shake of three parts carbohydrates and one part protein.

Eat a meal several hours later, and then reverse that ratio in your snack after another few hours, says Ivy. "This will keep protein synthesis going by maintaining high amino acid concentrations in the blood."

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.

The real expert says: "The knee joint is controlled by the quadriceps and the hamstrings. Balanced muscle activity keeps the patella in place and appears to be more easily attained in closed-chain exercises," says Stensdotter.

To squat safely, hold your back as upright as possible and lower your body until your thighs are parallel to the floor (or at least as far as you can go without discomfort in your knees).

Try front squats if you find yourself leaning forward. Although it's a more advanced move, the weight rests on the fronts of your shoulders, helping to keep your back upright, Stensdotter says.

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