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Source: http://www.enn.com/top_stories/article/45259
New Study Reveals the Key to Maintaining Healthy Knees
The human knee is an extremely important joint. It holds the weight of the entire body, provides the strength needed to lift heavy objects, and bends and flexes to give us mobility. Since this crucial joint is under stress at almost all times (except when sitting or lying down), it is susceptible to wear over time. This is especially true for the cartilage which holds together all the bones in the knee. As we age, the knee ages and the cartilage can develop a number of ailments that could potentially prohibit mobility. A new study presented at the annual meeting of the Radiological Society of North America found that both too much and too little physical activity can accelerate the degeneration of knee cartilage in middle-aged adults.
Knee problems are one of the most common afflictions around the world. In the United States, nearly 50 percent of all people may develop knee osteoarthritis by age 85. It is predicted by the 2030, that an estimated 67 million Americans over age 18 will have physician-diagnosed arthritis.
A previous study from the University of California at San Francisco (UCSF) found the connection between physical activity and cartilage degeneration. The new study from UCSF looked at the correlation over a 4-year period rather than a single point in time using MRI T2 relaxation times to track the evolution of the cartilage deterioration.
"T2 relaxation times generated from MR images allow for analysis of the biochemical and molecular composition of cartilage," said Wilson Lin, B.S., research fellow and medical student at UCSF. "There is increased water mobility in damaged cartilage, and increased water mobility results in increased T2 relaxation time."
Over 200 individuals, age 45-60, were given a questionnaire to record their physical activity. Cartilage at the patella, femur, and tibia of the right knee joint was measured at baseline, two-year and four-year visits.
The results show that frequent running and other high-impact activities appear to be associated with more cartilage degeneration and a higher risk of developing osteoarthritis. However, they also found that people with very low levels of physical activity had accelerated cartilage degeneration, suggesting that there is an optimal level of physical activity to preserve cartilage.
The researchers also stress other factors involved, such as a genetic disposition for osteoarthritis, obesity, or a history of knee injury or surgery. For those people at most risk, it is imperative to maintain a healthy weight and avoid high-impact exercise.
"Lower impact sports, such as walking or swimming, are likely more beneficial than higher impact sports, such as running or tennis, in individuals at risk for osteoarthritis," he said.
This study was presented at the annual meeting of the Radiological Society of North America.
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WARNING FROM RAEL: For those who don't use their intelligence at its full capacity, the label "selected by RAEL" on some articles does not mean that I agree with their content or support it. "Selected by RAEL" means that I believe it is important for the people of this planet to know about what people think or do, even when what they think or do is completely stupid and against our philosophy. When I selected articles in the past about stupid Christian fundamentalists in America praying for rain, I am sure no Rael-Science reader was stupid enough to believe that I was supporting praying to change the weather. So, when I select articles which are in favor of drugs, anti-semitic, anti-Jewish, racist, revisionist, or inciting hatred against any group or religion, or any other stupid article, it does not mean that I support them. It just means that it is important for all human beings to know about them. Common sense, which is usually very good among our readers, is good enough to understand that. When, like in the recent articles on drug decriminalization, it is necessary to make it clearer, I add a comment, which in this case was very clear: I support decriminalizing all drugs, as it is stupid to throw depressed and sad people (as only depressed and sad people use drugs) in prison and ruin their life with a criminal record. That does not mean that there is any change to the Message which says clearly that we must not use any drug except for medical purposes. The same applies to the freedom of expression which must be absolute. That does not mean again of course that I agree with anti-Jews, antisemites, racists of any kind or anti-Raelians. But by knowing your enemies or the enemies of your values, you are better equipped to fight them. With love and respect of course, and with the wonderful sentence of the French philosopher Voltaire in mind: "I disapprove of what you say, but I will defend to the death your right to say it".
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"Ethics" is simply a last-gasp attempt by deist conservatives and
orthodox dogmatics to keep humanity in ignorance and obscurantism,
through the well tried fermentation of fear, the fear of science and
new technologies.
There is nothing glorious about what our ancestors call history,
it is simply a succession of mistakes, intolerances and violations.
On the contrary, let us embrace Science and the new technologies
unfettered, for it is these which will liberate mankind from the
myth of god, and free us from our age old fears, from disease,
death and the sweat of labour.
Rael
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