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SINGAPORE - FEBRUARY 21: (L-R) Suzann Pettersen of Norway and Yani Tseng of Taiwan pose as Tseng puts a flower behind Pettersen's ear during a photocall at the Singapore Botanic Gardens prior to the start of the HSBC Women's Champions at the Tanah Merah Country Club on February 21, 2012 in Singapore. (Image credit: Getty Images via @daylife)

40+247 Concert (Photo credit: bark)

Hearing exam (Photo credit: Wikipedia)

                                        Seventy-two percent of teenagers participating in a study experienced reduced hearing ability following  exposure to a pop rock performance by a popular female singer.
                                         M.Jennifer Derebery.MD,House Clinic Research Institute tested teen's hearing before and after a concert and presented the study finding at the American Otologic Society meeting on April 21,2012 The study has been accepted for publication in an upcoming issue of Otology&Neurology
                                         The hearing loss that may be experienced after a pop rock concert is not generally  believed to be permanent. It is called a temporary threshold shift and usually disappears within 16-48 hours,after which a person's hearing returns to previous levels.
                                         Teenagers need to understand a single exposure to loud noise either from a concert or personal listening device can lead to hearing loss,"said M.Jennifer Derebery.MD.lead author and physician at the House Clinic. "With multiple exposures to noise over 85 decibels. the tiny hair cells may stop functioning and the hearing loss may be permanent."
                                          In the study. twenty-nine teenagers were given free tickets to a rock concert. To ensure a similar level of noise exposure for the teens. there were two block of seats within close range of each other. The seats were located in front of the stage at the far end of the venue approximately 15-18 row up from the floor
                                 Parental consent was obtained for all underage study participants The importance of using hearing protection was explained to the subjects and encouraged them to use the foam ear plugs. However only three teenagers chose to do so.
                                  Three adult researchers sat with the teenagers. Using a calibrated sound pressure meter, 1,645 measurements of sound decibel [dBA]levels were recorded during the 26 songs played during the three hour concert. The sound levels ranged from 82-110 dBA. with an average of  98.5 dBA. The mean level was greater than 100 dBA for 10 of the 26 songs
                                                   The decibel levels experienced at the concert exceeded what is allowable...                 to be contn....