Loud rock music contributed to hearing loss among baby boomers, but MP3 players are poised to make the problem much worse for the next generation.

These devices, which pump music through headphones directly into the ear canal, enable the user to overcome the rumble of the subway or the drone of an airplane engine without drawing angry shouts of “turn it down!”

As a result, they easily desensitize the user to dangerously high sound levels. A CD player and a Walkman do too, but MP3 players such as the iPod pose an additional danger.

Because they hold thousands of songs and can play for hours without recharging, users tend to listen continuously for hours at a time. They don’t even have to stop to change a CD or a tape.

Baby Boomers Listen Up

Longer Listening, More Damage

Since damage to hearing caused by high volume is determined by its duration, continuous listening to an MP3 player, even at a seemingly reasonable level, can damage the delicate hair cells in the inner ear that transmit sound impulses to the brain.

“Studies have shown that people exposed to 85 decibels for eight hours tend to develop hearing loss,” Brian Fligor, ScD, of Children’s Hospital in Boston, tells WebMD. He found that all the CD players he examined produced sound levels well in excess of 85 decibels.

“Every time you increase a sound level by three decibels, listening for half as long will produce the same amount of hearing loss. The kid who cuts my grass uses an iPod. The lawn mower noise is about 80 to 85 decibels. If he likes listening to his iPod 20 decibels above that, he’s in the range of 100-105 decibels. At that sound level he shouldn’t listen for more than eight to 15 minutes.”

But if he’s like millions of other iPod owners, the boy probably listens for several hours a day, placing a large noise burden on his hearing even if he turns it down when he’s not cutting grass.

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