Serum testosterone concentrations and excretion of 17-Ketosteroid in urine were determined in 32 caterpillar vehicle drivers exposed to low frequency vibration of the whole body and to noise. Testosterone concentrations were assessed by the RIA method in fasting after 3 hrs of work. 17-Ketosteroid excretion was measured in the 8-hr collection of night urine and in urine collected during the day's work. No significant differences were found in exposed workers, either in mean testosterone concentration in fasting and after 3 hrs of work or in 17-Ketosteroid excretion, before and during the work, when compared with the control group.
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