Splitting Hairs
As of 06-Jun-2014, there are 6656 articles that address NIHL listed on the National Library of Medicine’s search engine, Pubmed [1]. This is the source of the information I provided here, which out of necessity, must be brief. (BTW, the hair is part of the nerve cell.) In this body of work, I do not find that of Lidia. Will you provide a reference here for all of us to read?
Regards,
WHG
[1] Reference
Noise Induced Hearing Loss - PubMed - NCBI
As of 06-Jun-2014, there are 6656 articles that address NIHL listed on the National Library of Medicine’s search engine, Pubmed [1]. This is the source of the information I provided here, which out of necessity, must be brief. (BTW, the hair is part of the nerve cell.) In this body of work, I do not find that of Lidia. Will you provide a reference here for all of us to read?
Regards,
WHG
[1] Reference
Noise Induced Hearing Loss - PubMed - NCBI
Example Study of NIHL, Statistics Included
A correlation between exposure and NIHL is well established
There are a lot more studies just like this one, for which the abstract follows.
Singapore Med J. 1999 Sep;40(9):571-4.
A study of the noise hazard to employees in local discotheques.
Lee LT.
Author information
Abstract
AIM OF STUDY:
There is growing concern that amplified music in discotheques can cause hearing loss. This study attempts to evaluate the noise hazard of employees exposed to amplified music in our discotheques.
METHOD:
Employees comprising of disc jockeys, bartenders, waiters, cashiers and security officers of five selected discotheques were used for the study. Personal noise dosimetry was carried out on 40 employees throughout their workshift. The audiometric examination results of another 46 employees were compared with 37 subjects from a non-exposed match control group.
RESULTS:
The range of exposure to noise level above 85 dBA for the employees is 3.6 to 6.9 hours with a mean of 5.1 hours. All the occupational groups are exposed to noise level of at least 89 dBA Leq for their whole work shift. The discotheque group has statistically significant higher prevalence (41.9%) of early sensorineural hearing loss compared to the control group (13.5%). A higher proportion of employees in the older age group (above 30 years old) and working longer (above 1 year) suffer from hearing loss. A significant proportion of the discotheque study subjects (21%) also complained of recurrent tinnitus compared to 2.7% in the control group. The younger (< 30 years) and those with shorter exposure duration (< 1 year) appeared to complain of tinnitus more.
CONCLUSION:
The study shows that all the employees regardless of occupations are exposed to noise above the permissible level of 85 dBA Leq A high proportion of them also suffer from early sensorineural hearing loss and tinnitus.
PMID: 10628244 [PubMed - indexed for MEDLINE]
A correlation between exposure and NIHL is well established
There are a lot more studies just like this one, for which the abstract follows.
Singapore Med J. 1999 Sep;40(9):571-4.
A study of the noise hazard to employees in local discotheques.
Lee LT.
Author information
Abstract
AIM OF STUDY:
There is growing concern that amplified music in discotheques can cause hearing loss. This study attempts to evaluate the noise hazard of employees exposed to amplified music in our discotheques.
METHOD:
Employees comprising of disc jockeys, bartenders, waiters, cashiers and security officers of five selected discotheques were used for the study. Personal noise dosimetry was carried out on 40 employees throughout their workshift. The audiometric examination results of another 46 employees were compared with 37 subjects from a non-exposed match control group.
RESULTS:
The range of exposure to noise level above 85 dBA for the employees is 3.6 to 6.9 hours with a mean of 5.1 hours. All the occupational groups are exposed to noise level of at least 89 dBA Leq for their whole work shift. The discotheque group has statistically significant higher prevalence (41.9%) of early sensorineural hearing loss compared to the control group (13.5%). A higher proportion of employees in the older age group (above 30 years old) and working longer (above 1 year) suffer from hearing loss. A significant proportion of the discotheque study subjects (21%) also complained of recurrent tinnitus compared to 2.7% in the control group. The younger (< 30 years) and those with shorter exposure duration (< 1 year) appeared to complain of tinnitus more.
CONCLUSION:
The study shows that all the employees regardless of occupations are exposed to noise above the permissible level of 85 dBA Leq A high proportion of them also suffer from early sensorineural hearing loss and tinnitus.
PMID: 10628244 [PubMed - indexed for MEDLINE]
Yes
That is why I am certain he can provide a reference if he wants to.
Regards,
WHG
That is why I am certain he can provide a reference if he wants to.
Regards,
WHG
LWL on NIHL
My specific interest at the time I did research on NIHL was focused on the pathology, so my search did not surface Lidia’s work, which is located primarily outside medical journals.
Of interest here is the following, extracted from a web-search:
Topic: Noise-Induced Hearing Loss (anatomy of the ear, facts and standards regarding noise exposure, and hearing conservation)
When: Wednesday, November 16, 2005; 7:30pm
Location: School of Music, University of Michigan (North Campus)
Ann Arbor, Michigan, 48109
Topic: Noise-Induced Hearing Loss (anatomy of the ear, facts and standards regarding noise exposure, and hearing conservation)
Lidia Lee, an associate professor in the Department of Special Education at Eastern Michigan University, will discuss hearing loss tonight at Britton Recital Hall in the E.V. Moore building at 7:30 p.m. She will cover topics associated with preventing hearing loss, including exposure to loud music at rock concerts, listening to headphones, and general exposure to loud noise on a daily basis. Sponsored by the Audio Engineering Society Student Section, the event is geared toward students studying music or those who work regularly with sound.
When: Wednesday, November 16, 2005
Location: School of Music, University of Michigan, Ann Arbor, Michigan, 48109
My specific interest at the time I did research on NIHL was focused on the pathology, so my search did not surface Lidia’s work, which is located primarily outside medical journals.
Of interest here is the following, extracted from a web-search:
Topic: Noise-Induced Hearing Loss (anatomy of the ear, facts and standards regarding noise exposure, and hearing conservation)
When: Wednesday, November 16, 2005; 7:30pm
Location: School of Music, University of Michigan (North Campus)
Ann Arbor, Michigan, 48109
Topic: Noise-Induced Hearing Loss (anatomy of the ear, facts and standards regarding noise exposure, and hearing conservation)
Lidia Lee, an associate professor in the Department of Special Education at Eastern Michigan University, will discuss hearing loss tonight at Britton Recital Hall in the E.V. Moore building at 7:30 p.m. She will cover topics associated with preventing hearing loss, including exposure to loud music at rock concerts, listening to headphones, and general exposure to loud noise on a daily basis. Sponsored by the Audio Engineering Society Student Section, the event is geared toward students studying music or those who work regularly with sound.
When: Wednesday, November 16, 2005
Location: School of Music, University of Michigan, Ann Arbor, Michigan, 48109
A recent article about hearing loss, nerve fibers vs. hair cells here... actually the synapsis of them
Noise-Induced ?Hidden Hearing Loss? Mechanism?Nerve Fiber Loss? Discussed
"This suggests that every time we go to loud concerts or use power tools without ear protection, we may be losing cochlear nerve fibers and increasing our degree of hearing impairment"
Noise-Induced ?Hidden Hearing Loss? Mechanism?Nerve Fiber Loss? Discussed
"This suggests that every time we go to loud concerts or use power tools without ear protection, we may be losing cochlear nerve fibers and increasing our degree of hearing impairment"
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Sad that the hair growing out of my ears increases with each passing year, while the ones needed for hearing and on top of my head continually decrease...
More Argumentum ad Hominem [1]
It is entirely your game and you get to play it here however you see fit.
That fact is a given.
I just post here, and when necessary respond to your nonsense as well.
And, your latest installment is just another example of it.
WHG
Reference [1]
Argumentum Ad Hominem
It is entirely your game and you get to play it here however you see fit.
That fact is a given.
I just post here, and when necessary respond to your nonsense as well.
And, your latest installment is just another example of it.
WHG
Reference [1]
Argumentum Ad Hominem
I have often thought that calling the responding "transducers' on the cochlea "hairs" was a misnomer and do not know how that occurred. Because they do not grow, ever, and bear very little resemblance to the external "hair" that we are all familiar with. We don't call the cells on the surface of our tongue "hairs" and yet they are more like the cochlea cells. (If you have ever cooked tongue - one of my favorite dishes - then you will recognize these "hairs" at the back.)
Lidia has found that power tools are a major issue. Masculinity seems to prevent men from wearing hearing protection when they use them. Look around and you will find very few men wearing hearing protect when they use common household tools; lawnmower, chain saw, table saw, vacuum cleaner, hand saw. These are all major sources of potential damage. I use a table saw or lawnmower a lot more often than I go to a concert.
Hello Whgeiger
That's a rather disturbing photo. Do you know how loud that was or the frequency range??
Rob🙂
That's a rather disturbing photo. Do you know how loud that was or the frequency range??
Rob🙂
I had a bike tire blow up in my face one time. Was surprised how much power is contained in a bike tire. The explosion knocked me on my *** and I couldn't hear anything for a couple of minutes.
Back of the envelope: consider the effort required to pump up a bike tire to 35psi- You're more than doubling the air density (app. 15psi at sea level is 1 ATM) to achieve this, and so the air released would be, approx 470 in^3, to reach equilibrium. If my rough thinking is correct, that's like 10 12" subwoofers doing 0.65" forward excursion right next to your face, though there are time constants and other factors that complicate this.
Not surprising that it's a lot of force. Consider also, how much more effort it takes to pump a bike tire than a pellet gun.
Here is the educational article from which the photo comes.
Unfortunately the cause is not quantified, but I expect it is to an extreme, save that of an explosive blast.
Regards,
WHG
Badman,
Do the math if you want but the tires on my road bike take anywhere from 120psi to 160psi if your are nuts enough to ride them that hard. I imagine he was filling a baloon type tire that was rated for about 65psi and pumped it higher than that! Boom....
Do the math if you want but the tires on my road bike take anywhere from 120psi to 160psi if your are nuts enough to ride them that hard. I imagine he was filling a baloon type tire that was rated for about 65psi and pumped it higher than that! Boom....
Wow, I thought inflation pressure was much lower than that- now we're talking about quite a lot of force!
Road bike, tubes rated to 100psi, pumped them up at a gas station and didn't realize how powerful their compressor was.
BOOOOOM!