Researchers have gathered evidence which shows that combined chronic exposure to noise and carbon monoxide in the workplace induces hearing loss. Adriana Lacerda, researcher at the École d’orthophonie et d’audiologie of the Université de Montréal, presents her findings at the annual meeting of the Acoustical Society of America in Vancouver on Wednesday. Those findings are the result of a study conducted with over 8,600 workers exposed to both noise and carbon monoxide in the workplace. Among the riskier professions are welders, firefighters, garage mechanics, truckers, forklift operators and miners.
The correlation between carbon monoxide exposure and hearing loss had been established in previous animal studies but never in humans. Based on data gathered by the National Institute of Occupational Safety and Health, Lacerda compared the hearing of workers exposed to noise levels lower than 90 decibels for 8 hours to another group of workers exposed to noise levels above 90 decibels. In both groups, a sample of workers was also exposed to carbon monoxide.
The results revealed that the workers who were exposed to carbon monoxide and to noise levels above 90 decibels displayed significantly poorer hearing thresholds at high frequencies (from 3 to 6 kiloHertz). A larger shift was observed among workers with 25-29 years of noise exposure in the workplace.
"Based on these results, we recommend that such risks as chronic exposure to carbon monoxide be considered when assessing the risk of developing a noise-induced hearing loss," said Lacerda. One of several hypotheses to explain this phenomenon is that the reduction of oxygen in the blood stream accelerates the deterioration of the sensory cells of the inner ear.
Adriana Lacerda is currently finishing her doctoral thesis under the supervision of Professor Tony Leroux and Jean-Pierre Gagné of the École d’orthophonie et d’audiologie at the Université de Montréal. She is the recipient of the Brazilian government’s CAPES bursary (Coordenaçaõ de Aperfeiçoamento de Persoal de Nivel Superior), Universidade Tuiuti do Paraná bursary and also the recipient of a bursary of excellence from the Université de Montréal.
Rutgers-led innovation could spur faster, cheaper, nano-based manufacturing
14.02.2018 | Rutgers University
New study from the University of Halle: How climate change alters plant growth
12.01.2018 | Martin-Luther-Universität Halle-Wittenberg
For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.
In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.
But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...
Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.
The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...
Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters
Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
19.02.2018 | Materials Sciences
19.02.2018 | Materials Sciences
19.02.2018 | Life Sciences