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...common wisdom is that regular running or vigorous sport-playing during a person's youth subjects the joints to so much wear and tear that it increases his or her risk of developing osteoarthritis later in life. Research has suggested that may be at least partly true: in a study of about 5,000 women published in 1999, researchers found that women who actively participated in heavy physical sports in their teenage years or weight-bearing activities in middle age had a higher than average risk of developing osteoarthritis of the hip by age 50. (See the top 10 medical...

Author: /time Magazine | Title: Is Running Bad for Your Knees? Maybe Not | 12/25/2009 | See Source »

...nine-year study of 1,279 elderly residents of Framingham, Mass., resulted in similar findings: that the most active people had the same risk of arthritis as the least active. About 9% of the participants overall developed arthritis over the course of the study, as measured by symptoms reported to their physicians (pain and difficulty walking) as well as X-ray scans. And in the same year, Australian researchers writing in the journal Arthritis and Rheumatism found that people who exercised vigorously had thicker and healthier knee cartilage than their sedentary peers. That suggests the exercisers may have also enjoyed...

Author: /time Magazine | Title: Is Running Bad for Your Knees? Maybe Not | 12/25/2009 | See Source »

Together, the findings lend support to the theory that osteoarthritis, which affects nearly 20 million Americans, is caused mainly by genes and risk factors like obesity (obese men and women are at least four times as likely to become arthritic as their thinner peers), rather than daily exercise or wear and tear of joints. In fact, a "normally functioning joint can withstand and actually flourish under a lot of wear," says Fries. Because cartilage - the soft connective tissue that surrounds the bones in joints - does not have arteries that deliver blood, it relies on the pumping action generated by movement...

Author: /time Magazine | Title: Is Running Bad for Your Knees? Maybe Not | 12/25/2009 | See Source »

That's not to say that there are no risks in running. It can sometimes cause soft-tissue injuries and stress fractures, also called hairline fractures, which result from the compounding of tiny cracks in the bone over time. It's not uncommon for such tiny cracks to appear in the bones that bear the heaviest loads, like the tibia (shinbone), but they usually heal quickly and go unnoticed. Stress fractures occur when bone damage happens suddenly, without enough time to heal. For instance, high school athletes who stop training all summer and then abruptly start attending practice every...

Author: /time Magazine | Title: Is Running Bad for Your Knees? Maybe Not | 12/25/2009 | See Source »

...others, such as Monica Zalaquett, whose Center for the Prevention of Violence, has been working tirelessly to educate at-risk Managua youth about the dangers of guns and create a "new image of masculinity," the government's promotion of military weaponry is mind-blowing, especially considering the spike in gun-related deaths among teenagers this year...

Author: /time Magazine | Title: Have Yourself a Sandinista Christmas... | 12/21/2009 | See Source »

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