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.
New surveys from the American Speech-Language-Hearing Association highlight that risk, noting that high school students are much more likely than adults to blast the volume in their MP3 players, raising the risk of hearing loss later on.
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.
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.
Increasing reports like this have caused U.S. lawmakers to step in. Earlier this year, Rep. Edward Markey (D-Mass.) asked the National Institutes of Health to research the potentially devastating effects posed by earbud headphones. The NIH recently responded by saying, "Any type of headphone has the potential to cause [noise-induced hearing loss] if used improperly in terms of absolute level of the sounds, the length of exposure time to sound, and the fit of the earphone or headphone." They add that more research is still needed to determine if a particular type of earphone increases the risk.
"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.