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Taking HDL in stride.

Taking HDL in stride

A brisk, 45-minute walk "may be sufficient to evoke significant, temporary elevations in serum high-density lipoprotein [HDL] cholesterol in women," report researchers at Loma Linda University in Crestline, Calif. HDL is believed to help remove cholesterol from the bloodstream, where it might otherwise contribute to artery-clogging plaque.

Several studies have indicated that exercise -- especially prolonged, intense exercise -- can raise HDL cholesterol in both men and women. However, this is the first indication that moderate walking can achieve similar changes, says study leader Robert D. Lee.

His team monitored the effects of exercise on serum lipid levels in 12 healthy women in their mid- to late 30s whose weights averaged about 160 pounds. Exercise sessions began at 7:15 a.m. on each of two successive Sundays. On the first day, half the women exercised on treadmills for 45 minutes at a pace of about 4.6 miles per hour while the others rested quietly. The next week, the two groups switched regimes. The researchers took blood samples five times between 7 a.m. and 1 p.m. o each test day, then again at 7 the next morning.

The exercise fostered an apparent 6.2 percent rise in HDL cholesterol, lasting about 90 minutes. Lee says the increase primarily reflects a highly significant 11.6 percent increase in one subfraction known as HDL.
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Title Annotation:walking can help elevate high-density lipoprotein cholesterol in women
Author:Raloff, Janet
Publication:Science News
Date:Apr 27, 1991
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