For most of us, exercise is a good way to stay fit and live longer, but researchers at Pennington Biomedical Center in Baton Rouge say it may be actually be bad for some.

Lead researcher Dr. Claude Bouchard says a study of adults living a sedentary lifestyle yielded surprising results in which about 10% saw blood pressure increases along with higher risks for heart disease and diabetes.

''Most of the people who exercised, 90 percent percent of them, reduced blood pressure or reduced it substantially, but this group of 10 percent went in the wrong direction,'' said Dr. Bouchard.

Bouchard notes that the people in this study were not excising at all and that the 10% percent group has researchers baffled.

''We observed a worsening for one or two factors for heart disease, including elevated blood pressure levels,'' he explained.

Pending further study, Bouchard would suggest that some cardio patients might be better off without an exercise regimen.