“…Reports on the immediate consequences of noise exposure are inconsistent, with some showing increases in blood pressure [Andren, 1982;Andren et al, 1980Andren et al, , 1982 showing changes in the opposite direction, and others with varying results [Cartwright and Thomson, 1975;Dehn, 1984;Etholm and Egenberg, 1964;Sanden and Axelsson, 19811. In addition, epidemiological studies have not demon-strated clear conclusions. Many studies suggested that workers exposed to long-term occupational noise will suffer high blood pressure or increased risk of hypertension [Jonsson and Hansson, 1977;Manninen and Aro, 1979;Parvizpoor, 1976; Rosen et al, 1964;Singh et al, 1982; Talbott et al, 19851, but others suggested that there is no significant variation [Belli et al, 1984;Drettner et al, 1975;Hedstrand et al, 1977; Lees and Roberts, 1979; Malchaire and Mullier, 1979; Takala et al, 19771. Direct comparison of these studies is obviously difficult because each study had its own test criteria and parameters of interest.…”