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Journal of Sound and Vibration (1985) 102(4), 611-613

H U M A N RESPONSE T O VIBRATION ABSTRACTS

Prepared by M. J. Gri~n and J. Gri~n, Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, Southampton S09 5 NH, England C. A. Muir 1983 Medical Research Council, Ship Motion Working Party Report S M W P 1/83. Motion illness--a bibliography. (115 pages, 2 figures, 1 table, 417 references) (in English) Author's abstract. A bibliography of the research carried out since the Second World War on motion illness with particular reference to its prevention by drug treatment. The survey indicates some limitations of the data collected to determine the relationship between motion and the illness and contains a general review of methods of the drug trials completed in this field of research. Topics: Motion Sickness (general); Drugs; Ride (sea). B-O. Wickstrom and U. Eskilsson 1983 Undersokningsrapport 1983: 44, Abetarskyddsstyrelsen, Stockhohn. Helkroppsvibrationer I 1981/83 ars skogsmaskiner. (26 pages, 7 figures, 2 tables, 24 references) (in Swedish) Author's abstract. A survey of forest-machine drivers' exposure to whole-body vibration was accomplished. The vibration level was measured on the seat in 24 forest machines of year models 1981-1983 during normal work conditions. The study showed that the acceleration level, as a mean over a work-day, was in the range 0.23-0.68 m/s 2 rms for the different machines (frequency weighted value in the horizontal directions). Harvesters had substantially lower levels (0-26 m/s 2 rms) than other machines from 1971-1975; the new forwarders had about 25% lower frequency-weighted acceleration values. However for processors no change was measured. Topics: Vibration Measurements (off-road vehicles). O. Manninen and A. Ekblom 1984 International Archives of Occupational and Environmental Health 54, 1-17. Single and joint actions of noise and sinusoidal whole body vibration on TTS2 values and low frequency upright posture sway in men. (17 pages, 6 figures, 4 tables, 49 references) (in English) Authors" abstract. 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/s 2. 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. Aftgr the three expo.sure 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 4 611