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BLOOD CLOTS
Participating in sports seems to ward off clots.
THE QUESTION If blood flow becomes sluggish, a clot can develop in a vein deep in the body. Might stepped-up blood flow from physical activity offer protection?
THIS STUDY analyzed data on 7,860 adults, most in their mid-40s; slightly less than half had had a blood clot in a leg vein or lung artery.
About 31 percent of those who'd had a clot, and 40 percent of the others, said they participated in a sports activity (such as rowing, swimming, jogging, karate, aerobics, horseback riding) at least weekly. Regular sports participation reduced the risk of a blood clot by 39 percent for women and 22 percent for men, compared with those who did not participate in sports.
Clots in a lung artery were 46 percent less likely to develop in active people than in the others; leg vein clots were 24 percent less likely. Risk did not change based on the frequency of participation or intensity of the sport.
WHO MAY BE AFFECTED? Anyone can develop a blood clot in a leg vein (deep vein thrombosis), but these clots are more common if a vein is damaged in surgery or by injury, if blood flow has been slowed by inactivity or if medication or genetics has made the blood more likely to clot. Nearly all lung-artery clots (pulmonary embolisms) occur because a clot in the leg has broken free of the vein and traveled through the bloodstream to the lungs.
CAVEATS Some of the benefit attributed to sports participation may have resulted from weight loss associated with the activity. Data on sports participation were based on the participants' recollection.
