Isfahan University of Medical Sciences

Science Communicator Platform

Stay connected! Follow us on X network (Twitter):
Share this content! On (X network) By
The Efficiency of Hearing Protective Devices Against Occupational Low Frequency Noise in Comparison to the New Subjective Suggested Method Publisher



Forouharmajd F1 ; Nazaryan K2 ; Fuente A3 ; Pourabdian S1 ; Asady H1
Authors
Show Affiliations
Authors Affiliations
  1. 1. Department of Occupational Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Student Research Committee, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Ecole d'orthophonie et d'audiologie, Faculte de medecine, Universite de Montreal, Montreal, QC, Canada

Source: International Journal of Preventive Medicine Published:2022


Abstract

Backround: Noise is one of the most important occupational and environmental health hazards. Exposure to loud noise can cause irrevocable hearing damage and loss of hearing. The aim of this study was to determine the efficiency of two samples of earmuff and earplug in low frequency noise reduction in comparison to subjective method. Methods: All the procedures of the work were done using the simulated human ear canal and the required microphone in the eardrum. At the octave frequencies, that is 31.5 and 63.5, 125, 250, 500, 1000, 2000, 4000, and 8000 Hz, and intensities of 85-90 dB, one stage was done by using the individual's subjective response relative to the received sound before and after using the ear protector. Results: The sound levels before and after the protection were significantly different in both the model and humans (P < 0.05). However, at 315 Hz frequency, the rate of attenuation is increased by 4 dB after placing the earplug and 14 dB after placing the earmuff, showing a reduction of 18 dB. Conclusions: This study verifies the increasing protection by simultaneous application of earplugs and earmuffs. Because of the laboratory evaluation of ear protectors, it is possible not to justify the proficiency of ear protectors in a subjective method. © 2022 International Journal of Preventive Medicine.
Related Docs
View other Related Docs
1. Investigating the Effect of Ear Canal Length on Improving Earplugs and Earmuffs Performance at 400 and 500 Hz Frequencies, International Journal of Environmental Health Engineering (2024)
2. Protective Earphones and Human Hearing System Response to the Received Sound Frequency Signals, Journal of Low Frequency Noise Vibration and Active Control (2018)
3. Development of the Subjective Evaluation Method of Hearing Protectors, Canadian Acoustics - Acoustique Canadienne (2023)
4. Evaluation of Different Hearing Loss Disorders Among Cane Industry Workers, Iran Occupational Health (2014)
5. Evaluation of the Changes in Sound Absorption Coefficient of Some Commonly Used Earmuffs in Laboratory Conditions, Journal of Health System Research (2024)
6. Acoustical Role of Ear Canal in Exposure to the Typical Occupational Noise Levels, Medical Journal of the Islamic Republic of Iran (2021)
7. Investigating the Absorbent Transmission Loss of Some Common Earmuffs in One-Third Octave Band Frequency Based on the Impedance Tube Method, Journal of Health System Research (2024)
8. Investigating the Psychoacoustic Characteristics of Absorbents Used in Common Earmuffs: A Laboratory Study, International Journal of Environmental Health Engineering (2023)
Experts (# of related papers)
View all Related Experts
Siamak Pourabdian (15)
Farhad Forouharmajd (13)
Other Related Docs
9. Psychoacoustic Parameters and Ear Canal Role, Canadian Acoustics - Acoustique Canadienne (2023)
10. Correlation Between Reduced Work Speed and Noise Annoyance Due to Exposure to Low-Frequency Noises, International Journal of Environmental Health Engineering (2020)
11. The Epidemiologic Study on Hearing Standard Threshold Shift Using Audiometric Data and Noise Level Among Workers of Isfehan Metal Industry, Koomesh (2009)
12. The Prevalence and Correlates of Hearing Loss in Drivers in Isfahan, Iran, Archives of Iranian Medicine (2009)
13. Prevalence Hearing Loss of Truck and Bus Drivers in a Cross-Sectional Study of 65533 Subjects, Environmental Health and Preventive Medicine (2019)
14. Wideband Tympanometry: Normative Data for Young Iranian Adults, Audiology and Neurotology (2023)
15. Hearing Aid Validation Based on 40 Hz Auditory Steady-State Response Thresholds, Hearing Research (2015)
16. The Noise Absorption Prediction of a Combined and Independent Absorber Under Different Conditions and at Different Frequencies, Using the New Engineering Noise Control Software (Enc), Heliyon (2022)
17. Comparison of Nursing Home Hearing Handicap Index With Audiological Findings: A Presbycusis Study, Journal of Aging Research (2012)
18. The Effect of Low Frequency Noises Exposure on the Precision of Human at the Mathematical Tasks, International Journal of Preventive Medicine (2022)
19. Ear Surgery Techniques Results on Hearing Threshold Improvement, Journal of Research in Medical Sciences (2013)
20. Early Detection of Noise Induced Hearing Loss by Extended High Frequency Audiometery, Journal of Isfahan Medical School (2007)
21. Protective Effect of N-Acetylcysteine Against Continuous Noise-Induced Hearing Loss, Journal of Occupational Health and Epidemiology (2023)
22. Frequency of Hearing Impairment Among Full-Term Newborns in Yazd, Iran, Iranian Journal of Pediatrics (2013)
23. Active Noise Cancellation of Low Frequency Noise Propagating in a Duct, International Journal of Environmental Health Engineering (2012)
24. The Analysis of the Cognitive Function Parameters in Exposure to Noise Using Emotiv-Epoc Electroencephalography Headset, International Journal of Environmental Health Engineering (2023)
25. Application of Hybrid Shannon’S Entropy–Promehtee Methods in Weighing and Prioritizing Industrial Noise Control Measures, Theoretical Issues in Ergonomics Science (2022)
26. An Improved Spectral Subtraction Algorithm for Noise Reduction in Cochlear Implants With Increasing Number of Channels, Journal of Isfahan Medical School (2013)
27. Laboratory Study of the Effect of Exposure Time to Noise and Sound Pressure Level on Mental Fatigue and Release of Noradrenaline the in Human Body, Journal of Health System Research (2019)
28. Evaluation of the Effect of Noise on the Rate of Errors and Speed of Work by the Ergonomic Test of Two-Hand Co-Ordination, International Journal of Preventive Medicine (2013)
29. Evaluation of Environmental Sound Pressure Level, Drawing of Noise-Isosonic Map Using Surfer V.19, and Prioritization of Engineering Noise Control Methods Using the Analytic Hierarchy Process (Ahp): A Field Study in Cgs Stations, Sound and Vibration (2022)
30. The Effect of Soundproof Headphones During Orthopedic Surgery Under Spinal Anesthesia on Patients' Physiological Indices and Duration of Recovery: A Randomized, Controlled, Clinical Trial, Journal of Perianesthesia Nursing (2024)
31. The Effect of Earplugs and Eye Mask on Patients' Perceived Sleep Quality in Intensive Care Unit, Iranian Journal of Nursing and Midwifery Research (2014)
32. The Role of Absorptive Silencer in Reduction of Low-Frequency Noise Produced by a Fan, International Journal of Environmental Health Engineering (2015)