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Single and joint actions of noise and sinusoidal whole body vibration on TTS2 values and low frequency upright posture sway in men

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Summary

In the present study the changes in the TTS2 values and body upright posture sway were examined after exposure of subjects (n =10) to stable broadband (white) noise (90 dB) alone, to sinusoidal vibration alone [directed vertically at the whole body (Z axis)], and to simultaneous exposure combinations of noise and vibrations of the same type. The frequency of the vibration was 5 Hz, but its acceleration was either 2.12 or 2.44 m/s2. There were six exposure combinations, and subsequently 60 tests were carried out in an exposure chamber. One test consisted of a control period of 30 min, of three consecutive exposure periods of 16 min each and of a recovery period of 15 min. After the three exposure combinations which included noise, half of the subjects were exposed to vibration during the recovery period. Apart from indicating an increase in the temporary hearing threshold, the results showed that simultaneous exposure to noise and vibration increases the instability of the body upright posture. The TTS2 values at the 4 and 6 kHz frequencies increased considerably more rapidly when the subjects were exposed simultaneously to noise and vibration than when exposed to noise alone. Without exception, the TTS2 values increased most during the first exposure period. It was noteworthy that exposure to vibration during the recovery period accelerated the recursion of the TTS2 values, especially in cases where the subjects had been exposed to noise alone. The variance of the body sway amplitudes and the standard deviation increased within the frequency range 0.063\2-2.000 Hz owing to noise alone and simultaneous noise and vibration. In the directions X and Y, within the frequency ranges 0.063\2-0.100 Hz and 0.100\2-0.600 Hz, the means of the maximum amplitudes of body sway increased especially in connection with those tests in which the subjects had been simultaneously exposed to noise and vibration.

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Authors and Affiliations

  1. Department of Public Health, Faculty of Medicine, University of Tampere, Box 607, SF-33101, Tampere 10, Finland

    Olavi Manninen & Ari Ekblom

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  1. Olavi Manninen
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  2. Ari Ekblom
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Preliminary results from the stabilometric measurements were presented in Espoo, Finland, at the International Course on Occupational Safety Research on November 1 to 5, 1982

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Manninen, O., Ekblom, A. Single and joint actions of noise and sinusoidal whole body vibration on TTS2 values and low frequency upright posture sway in men. Int Arch Occup Environ Heath 54, 1–17 (1984). https://doi.org/10.1007/BF00378724

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