Abstract
The method of adjustment, whereby a subject equates two stimuli by active adjustment of one to match the other, has been used to construct a set of equal comfort curves for both men and women in an unrestrained sitting position, covering the frequency range of 4 to 80 Hz. It has been suggested that differences in posture, methodology and experimental environments have led to large discrepancies between the results of early studies in the field of human sensitivity to whole body vibration. Consequently, the experiment has been repeated, in identical environmental conditions, for male subjects in a standing position and also for male subjects in the unrestrained sitting position used previously but employing a different vibration frequency as the reference. The effects of changed posture and reference vibration stimulus are reported. Comparisons are also made between the results of this study and of other recent investigations.
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