矿山凿岩工人2种频率指端振动觉阈值分析

Investigation and analysis on fingertip vibrotactile perception threshold at two frequencies in mine drilling workers

目的分析矿山凿岩工人2种频率下的指端振动觉阈值(VPT)改变特征。方法采用随机数表法,从湖北省多家矿山中选择48名从事手传振动作业工龄≥1.0年的凿岩工人为接振组,选择不接触手传振动的工人为对照组。采用HVLab指端振动觉阈值测试仪对2组人群进行31.5、125.0 Hz频率的定量指端VPT检查。结果 2组人群均无出现职业性手臂振动病的相关临床症状。在31.5、125.0 Hz频率,接振组人群指端VPT高于对照组(P<0.01),小指指端VPT高于食指(P<0.01);在125.0 Hz频率,接振组人群优势手指端VPT高于非优势手(P<0.01)。结论接触手传振动的矿山凿岩工人指端VPT升高,并存在一定的手指和优势手差异。

Objective To analyze the characteristic change of fingertip vibrotactile perception threshold(VPT)at two different frequencies among mine drilling workers.Methods A total of 48 mine drilling workers exposed to hand-transmitted vibration for at least 1.0 year were selected from mines in Hubei Province as the vibration exposure group by using the random number table method,and workers without hand-transmitted vibration exposure were selected as the control group.An HVLab vibrotactile perception meter was used to measure the fingertip VPT at 31.5 and 125.0 Hz in workers of these two groups.Results None of the workers in these two groups showed any clinical symptoms associated with occupational hand-arm vibration diseases.At 31.5 and 125.0 Hz,the fingertip VPT in the vibration exposure group was higher than that in the control group(P<0.01),the fingertip VPT of the little fingers was higher than that of the index fingers(P<0.01).At 125.0 Hz,the fingertip VPT of the fingers in dominant hands was higher than that in non-dominant hands in workers of the vibration exposure group(P<0.01).Conclusion The mine drilling workers with hand-transmitted vibration exposure had higher fingertip VPT.There were differences of VPT in fingers and dominant hands.