Clinical Unit of Occupational Medicine, Department of Medical Sciences, University of Trieste, Italy.
Department of Mechanical Engineering, Politecnico di Milano, Italy.
Ind Health. 2024 Feb 9;62(1):32-38. doi: 10.2486/indhealth.2023-0023. Epub 2023 May 20.
This study compared the relative performance of alternative frequency weightings of hand-transmitted vibration (HTV) to predict the extent of cold-induced vasoconstriction in the digital arteries of HTV workers. The cold response of digital arteries was related to measures of daily vibration exposure expressed in terms of r.m.s. acceleration magnitude normalised to an 8-h day, frequency weighted according to either the frequency weighting W defined in international standard ISO 5349-1:2001 (A(8) in ms r.m.s.) or the hand-arm vascular frequency weighting W proposed in the ISO Technical Report 18570:2007 (A(8) in ms r.m.s.). The measure of daily vibration exposure constructed with the frequency weighting W (A(8)) was a better predictor of the cold response of the digital arteries in the HTV workers than the metric derived from the conventional ISO frequency weighting W (A(8)). This finding suggests that a measure of daily vibration exposure constructed with the vascular weighting W, which gives more weight to intermediate- and high-frequency vibration (31.5-250 Hz), performed better for the prediction of cold induced digital arterial hyperresponsiveness than that obtained with the frequency weighting W recommended in ISO 5349-1 which gives more importance to lower frequency vibration (≤16 Hz).
本研究比较了替代手传振动（HTV）频率加权的相对性能，以预测 HTV 工人手指动脉冷诱导血管收缩的程度。手指动脉的冷反应与以均方根加速度表示的每日振动暴露测量值有关，该测量值归一化为 8 小时工作日，根据国际标准 ISO 5349-1:2001 中定义的频率加权 W（A(8) in ms r.m.s.）或 ISO 技术报告 18570:2007 中提出的手部臂部血管频率加权 W（A(8) in ms r.m.s.）进行频率加权。使用频率加权 W（A(8)）构建的每日振动暴露测量值比源自传统 ISO 频率加权 W（A(8)）的指标更能预测 HTV 工人手指动脉的冷反应。这一发现表明，使用血管加权 W 构建的每日振动暴露测量值，对中高频振动（31.5-250 Hz）赋予更大权重，比 ISO 5349-1 推荐的频率加权 W 更能预测冷诱导手指动脉高反应性，后者更重视低频振动（≤16 Hz）。
