Boots WebMD Partners in Health
Return To Boots

Children's and parenting health centre

This article is from the WebMD News Archive

How loud music causes cell damage

Loud music from earphones is well known as a risk factor for hearing problems, now University of Leicester researchers have found how noise damages nerves in the ear
WebMD UK Health News
Medically Reviewed by Dr Sheena Meredith
young adult wearing earbuds

31st August 2012 - It is well known that loud music can damage hearing, now a study by the University of Leicester has uncovered just how the damage is caused.

Nerve cells carrying electrical signals from the ears to the brain have a protective coating called the myelin sheath. Pumping up the volume and exposing ears to loud noise over 110 decibels can strip the cells of the coating. This disrupts the signals, causing hearing problems over time.

Action on Hearing Loss says some portable music players can be wound up to volumes of 100dB(A) - above danger levels and as loud as being next to a pneumatic drill at road works.

Cell damage

The research is said to be the first linking loud noise to damage to the coating on nerve cells and is published in the Proceedings of the National Academy of Sciences.

Myelin sheath damage is believed to be the cause of nerve damage in multiple sclerosis.

Dr Martine Hamann from the University of Leicester department of cell physiology and pharmacology led the hearing loss study. "Dissecting the cellular mechanisms underlying this condition is likely to bring a very significant healthcare benefit to a wide population," she says in a news release. "The work will help prevention as well as progression into finding appropriate cures for hearing loss."

Dr Hamann says the sheath can rebuild itself allowing the nerve cells to work properly again, meaning hearing loss can be temporary. "We now understand why hearing loss can be reversible in certain cases. We showed that the sheath around the auditory nerve is lost in about half of the cells we looked at, a bit like stripping the electrical cable linking an amplifier to the loudspeaker.

"The effect is reversible and after three months, hearing has recovered and so has the sheath around the auditory nerve."

Earlier research by the Leicester team focussed on the effect of loud noise on the brain's dorsal cochlear nucleus. This carries signals from the ear's nerve cells the part of brain responsible for decoding and understanding sound.

Damage to cells in this area was found to cause tinnitus, or ringing in the ears.

Reacting to the findings in an emailed statement Action on Hearing Loss's head of biomedical research Dr Ralph Holme says: "Tinnitus erodes the quality of life for more than 600,000 people in the UK, which is why it is so important that effective treatments are developed to silence it.

"Only with more investment in research, like that being carried out at the University of Leicester, to better understand the cellular processes involved can we hope to find much needed cures."

Tips to protect hearing

Action on Hearing Loss offers tips on protecting hearing for people using personal music players.

It says good quality earphones or headphones are important. Some of the ones that come free with a gadget may be poor quality, leaking sound and letting in the background noise. To get round this, people simply turn up the volume, sometimes to dangerous levels.

The charity says sound-isolating or noise-cancelling headphones are better at blocking background noise, so listening volumes can be lower.

It also recommends regular breaks from music through earphones of at least five minutes an hour.

Many devices have volume limiting features which can be used to set safe maximum volume levels.

Reviewed on August 31, 2012

Children's health newsletter

Tips to inspire healthy habits
Sign Up

Popular slideshows & tools on BootsWebMD

man holding back
Myths & facts about back pain
hands grabbing knee
How to keep your joints healthy
bowl of soup
Small changes that lead to weight loss
cute baby
Simple tips to keep baby's skin healthy
cute dog
10 common allergy triggers
Do you know what causes hair loss?
woman exercising
Exercises for low back pain
sperm and egg
Facts to help you get pregnant
bucket with cleaning supplies in it
Cleaning for a healthy home
rash on skin
Soothe skin and prevent flare-ups
mother and child
Could your baby be allergic to milk?
pregnant woman eating healthy salad
Nutrition needs before pregnancy