VOA慢速英语 骨质疏松症增加骨折风险

　　VOICE TWO:

　　Some people who are afraid of exercise worry about its effects on their joints, especially the knees. They are afraid exercise might cause osteoarthritis, a condition in which connective tissue around the bones wears down. A study in The Netherlands found that could be true. Results of the study were reported recently in the publication "Arthritis Care and Research."

　　Researchers studied one thousand six hundred seventy eight people over a period of twelve years. The subjects were between fifty-five and eighty-five years old. The results linked knee osteoarthritis to high mechanical strain -- activities that are hard on joints.

　　VOICE ONE:

　　But another study found that regular exercise does not harm joints. Those findings were reported in "The Journal of Anatomy." Scientists from Germany and the United States considered earlier research on the effect of exercise on joints. They did not find a link between regular exercise and knee osteoarthritis.

　　If you are still worried about exercise for osteoporosis, why not go for a walk? But you have to do it correctly. The Mayo Clinic says hold your head high. Straighten your back and neck as much as possible. Tighten the chest muscles. As you move along, let your shoulders and arms move freely and naturally.

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