Evaluation of Auditory Fatigue in Combined Noise, Heat and Workload Exposure

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  • CHEN Chiou-Jong
    Institute of Occupational Safety and Health, Council of Labor Affairs
  • DAI Yu-Tung
    Department of Occupational Safety and Health, College of Human Science and Technology, Chung Hwa University of Medical Technology
  • SUN Yih-Min
    Department of Occupational Safety and Health, College of Human Science and Technology, Chung Hwa University of Medical Technology
  • LIN Yi-Chang
    General Education Center, Toko University
  • JUANG Yow-Jer
    Department of Occupational Safety and Health, College of Human Science and Technology, Chung Hwa University of Medical Technology Institute of Environmental Health, College of Public Health, National Taiwan University

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This study was performed in a climatic chamber to evaluate the combined effects of noise intensity, heat stress, workload, and exposure duration on both noise-induced temporary threshold shift (TTS) and the recovery time by adopting Taguch's method. Fourteen subjects without previous significant noise exposure and smoking history were recruited to participate in this study. All hearing threshold levels at eight different frequencies (250 to 8,000 Hz) of better ear were measured in an audiometric booth by using the ascending method in 2 dB steps before each exposure condition. The test was also carried out after exposure to evaluate TTS at various times. The TTS recovery time was assessed using an audiometric test on all subjects at post-exposure times of 2, 20, 40, 60, 80 and 120 min, respectively. It was found that TTS depended mainly on the exposed noise dose and was enhanced by workload and heat stress. The TTS recovery time is dependent upon the magnitude of the initial hearing loss. In conclusion, TTS driven by noise exposure is enhanced by heat and workload. Further studies are required to evaluate the effects of workload with extreme temperature in a workplace environment.<br>

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