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The Combined Effect of Industrial Noise Type, Level and Frequency Characteristics on Hand Motor Skills: A Lab Trial Study Publisher Pubmed



Nassiri P1 ; Monazzam MR1 ; Dehghan SF2 ; Teimori G3, 4 ; Zakerian SA1 ; Azam K5 ; Asghari M6
Authors
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Authors Affiliations
  1. 1. Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Occupational Health, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  3. 3. Department of Occupational Health Engineering, School of Health, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran
  4. 4. Health Sciences Research Center, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran
  5. 5. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  6. 6. Department of Occupational Health, School of Public Health, Arak University of Medical Sciences, Arak, Iran

Source: Work Published:2021


Abstract

BACKGROUND: The study aimed to assess the interactive effects of industrial noise type, level and frequency characteristics on hand motor skills using the Minnesota Manual Dexterity Test and the Hand Tool Dexterity Test. METHODS: A total of ten nonsmoking male volunteers with normal hearing and vision were selected for this study. The study followed a full 3×3×2 factorial design. Independent variables were noise type (steady, intermittent and fluctuating), noise level (75, 85 and 95 dBA) and frequency characteristics ('roar' <2000Hz and 'hiss' >2000Hz). RESULTS: For Minnesota Manual Dexterity Test, the lowest speed is related to steady hiss noise at 75 dBA and the highest speed is related to fluctuating roar noise at 95 dBA. The speed is being significantly affected by the frequency characteristic (P=0.041) and noise type (P=0.025). The effect of hiss noise on speed is greater than roar noise (P=0.038). There is a significant difference (P=0.035) between continuous noise and fluctuating noise. For the Hand Tool Dexterity Test, the lowest speed is related to fluctuating hiss noise at 95 dBA and the highest speed is related to steady roar noise at 95 dBA. The speed is being significantly affected by the frequency characteristic (P=0.002), noise type (P=0.0001) and noise level (P=0.005). The effect of hiss noise on response variable to be greater than roar noise (P=0.008). There is a significant difference (P=0.0001) between steady noise and the two other types of noise, and also there is a significant difference between 75 dBA and 85 dBA level (P=0.003). CONCLUSIONS: The results showed that on hand motor skills, speed response was influenced by three characteristics: the type of noise, frequency characteristics and noise level. Also, the effect of the hiss noise was more than the roar noise. © 2021 - IOS Press. All rights reserved.
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