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To the Editor: Dr Tanasescu and colleagues¹ report that some forms of apparently invigorating exercise are not associated with any reduced risk of cardiovascular events. Similarly, they found that exercise intensity may be more important than duration for reducing the risk of CHD. Although the authors attempt to explain the lack of benefit associated with more than 1 hour weekly of swimming or cycling by noting that only several hundred of the study participants were in the category claiming more than 1 hour weekly, they did not offer a similar rationale for the nonsignificant effects of jogging or racquet sports. The authors did find benefits of running and rowing more than 1 hour weekly, but the risk ratios were less impressive than those associated with walking rapidly when one chooses to walk at all.

Despite the authors' extensive statistical adjustment, the data suggest that risk of CHD may be related . . . [Full Text of this Article]

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