Findings will be published in the June issue of the journal Movement Disorders.
ďThis confirms what has been found in previous studies: that occupational or other exposure to herbicides, insecticides and other pesticides increases risk for Parkinsonís,Ē says Jim Maraganore, M.D., Mayo Clinic neurologist and study investigator. ďWhat we think may be happening is that pesticide use combines with other risk factors in menís environment or genetic makeup, causing them to cross over the threshold into developing the disease. By contrast, estrogen may protect women from the toxic effects of pesticides.Ē
The investigators identified all those in Olmsted County, Minn., home of Mayo Clinic, who had developed Parkinsonís disease between 1976 and 1995. Each person with Parkinsonís disease was matched for comparison to someone similar in age and gender who did not have the disease. The researchers conducted telephone interviews with 149 of those with Parkinsonís and 129 of those who did not have the disease, or a proxy for these people, to assess exposure to chemical products via farming occupation, non-farming occupation or hobbies. The investigators were unable to determine through these interviews the exact exposure levels of these individuals or the cumulative lifetime exposure to pesticides.
Overall, the study found that the men with Parkinsonís were 2.4 times more likely to have had exposure to pesticides than those who did not have Parkinsonís. Women who had Parkinsonís, on the other hand, had a far lower frequency of exposure to pesticides than men with the disease.
This study was undertaken due to conflicting results from previous studies of pesticides and other chemical products and risk for Parkinsonís.