This Article  • Full text  • PDF  • Send to a friend  • Save in My Folder  • Save to citation manager  • Permissions  Citing Articles  • Citation map  • Citing articles on HighWire  • Contact me when this article is cited  Related Content  • Related article  • Similar articles in JAMA  Social Bookmarking   What's this?

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

To the Editor: Dr Hu and colleagues¹ found a linear inverse association between physical activity and ischemic stroke. Their study used a metabolic equivalent (MET) task measure that is derived by multiplying the self-reported intensity of physical activity by its duration. The MET measure is associated with the "volume theory," which assumes that the amount (caloric expenditure or duration) of physical activity is a critical part of the protective stimulus and that combinations of intensity and duration are relatively interchangeable.² Therefore, with the MET measure, a person could perform an activity at a 4-MET level (intensity) for an hour and receive an MET score of 4. The same score would be obtained by performing an 8-MET activity for 30 minutes. However, these different levels of intensity may have significantly different effects.³

Moreover, we found that there is very little evidence that a specific duration of activity or exercise is required . . . [Full Text of this Article]

CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter     What's this?

RELATED ARTICLE

Physical Activity and Risk of Stroke in Women
Frank B. Hu, Meir J. Stampfer, Graham A. Colditz, Alberto Ascherio, Kathryn M. Rexrode, Walter C. Willett, and JoAnn E. Manson
JAMA. 2000;283(22):2961-2967.
ABSTRACT | FULL TEXT  

THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES

Physical activity attenuates the effect of increased left ventricular mass on the risk of ischemic stroke: The Northern Manhattan Stroke Study
Rodriguez et al.
J Am Coll Cardiol 2002;39:1482-1488.
ABSTRACT | FULL TEXT