Combined Effects of Exposure to Noise and Whole-Body Vibration in Dumpers, Helicopters and Railway Engines

1993 ◽  
Vol 12 (3) ◽  
pp. 75-85 ◽  
Author(s):  
U Landström ◽  
A Kjellberg ◽  
R Lundström
Keyword(s):  
Working Conditions ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Combined Effects ◽  
Combined Exposure ◽  
Performance Levels ◽  
Body Vibration ◽  
Combined Exposures ◽  
And Performance ◽  
Noise Vibration

Three groups of 24 subjects were exposed to alternated periods of noise, vibration and combined exposures of both stimuli, recorded during working conditions in a dumper, a helicopter and a railway engine, respectively. Each condition included 30 minutes' exposure during which wakefulness and performance were measured by means of EEG and a computerized test respectively. The subjects also rated their drowsiness and annoyance. Results of the EEG measurements indicated the lowest level of wakefulness during the combined exposure in all three environments. The differences in ratings of drowsiness between exposures also tended to be higher during the period of combined exposures. The rated annoyance levels were always at the highest level during the combined exposure. Almost equal performance levels were found during the periods of exposure.

Vibration Disease: Exposure Level and Duration-Dependent Characteristics and Features of the Clinical Picture Following Local and Combined Local and Whole Body Vibration

2021 ◽  
pp. 30-35
Author(s):  
NP Chistova ◽  
LB Masnavieva ◽  
IV Kudaeva
Keyword(s):  
Clinical Picture ◽  
Work Experience ◽  
Whole Body Vibration ◽  
Occupational Exposures ◽  
Whole Body ◽  
Exposure Level ◽  
Combined Exposure ◽  
Local Vibration ◽  
Body Vibration ◽  
Vibration Disease

Introduction: Vibration disease is induced by a long-term occupational exposure to vibration above the maximum permissible level and is manifested by damage to the peripheral vascular and nervous systems and disorders of the musculoskeletal system. Objective: To study the exposure level and duration dependency and features of the clinical picture of vibration disease in workers exposed to local and combined local and whole body vibration. Materials and methods: The study included 136 male workers. Cohort I consisted of 60 patients (mean age: 49.5 ± 7.4 years) with vibration disease related to the local vibration exposure; cohort II included 76 patients (mean age: 55.7 ± 4.8 years) with vibration disease induced by the combined exposure to hand-arm and whole body vibration. Results: The examined subjects worked in harmful working conditions of classes 3.1–3.4. Measured vibration exceeded maximum permissible values at most workplaces. Levels of local vibration did not differ significantly between the cohorts and amounted to 115.0 and 118.0 dB; the level of whole body vibration in cohort II was 116.0 dB. Shorter work experience and younger age at the time of diagnosing the occupational disease were registered in people exposed to local vibration only compared to those with a combined exposure. The angiodystonic syndrome was twice as frequent in cohort I, while cohort II had a larger proportion of patients with concomitant diseases (low back pain, periarthrosis, etc.). Conclusion: Our findings indicate the necessity to reduce occupational exposures to vibration and take appropriate therapeutic and preventive measures in order to maintain health and work ability of employees.

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