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Lead Stories: Friday, September 5, 2008

Q & A: Is stretching helpful or harmful for exercisers?

Posted November 30th, 2007 at 2:12 PM by Andrew Goodman

Section: Health & Fitness, Injury & Rehab, Exercise

stretching-girl2 Stretching the leg muscles improves muscle flexibility and strength, running speed, and jumping distance, according to a study from Louisiana State University (Medicine and Science in Sports and Exercise, October 2007).

Stretching elongates muscles and tendons. Longer tendons allow muscles to exert a greater torque on the joint to exert more power to help you lift heavier, jump higher and run faster.

However, other studies show that you should not stretch before a competition involving speed and strength (Journal of Bodywork and Movement Therapies, April 2006). The longer the athletes stretched, the weaker they became. Prolonged stretching fatigues muscle fibers so that they contract with reduced force.
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Partial Knee Replacement: Less Pain, but Not for Everyone

Posted September 4th, 2007 at 9:35 AM by Hariz Siddiqui

Section: Health & Fitness, Injury & Rehab

partial knee replacement diagram image knee joint The ends of bones are soft, so they must be covered with a thick white gristle called cartilage. Many people suffer from knee pain because the cartilage is damaged. They may have osteoarthritis in which the cartilage wears away, or they may have damaged cartilage in an accident or by playing sports. Once damaged, cartilage can never heal; the person spends the rest of his life losing cartilage until the cartilage is completely gone and the knee hurts 24 hours a day.

Until recently, the only effective treatment has been to cut out the ends of the bones of the knee and replace the entire knee joint. Now for some people, a simpler procedure may be effective: partial knee replacement, called unicompartmental knee arthroplasty. The surgeon removes just part of the cartilages and bones on the upper and lower legs on one side of the knee.
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