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吉林大学远程教育学院

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    >>>>   Unit Sixteen
    >>>>   Unit Seventeen
    >>>>   Unit Eighteen
    >>>>   Unit Nineteen
    >>>>   Unit Twenty
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    >>>>   Unit Thirty

Exercise and Health (Ⅰ)

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     There are other benefits to the heart from exercise.A heart attack is usually caused by an obstruction of the blood vessels on the outside of the heart that supply oxygen to the heart muscle. When you exercise regularly at 120 beats a minute, you enlarge those blood vessels. There’s a type of fat in the blood called low-density cholesterol that many authorities believe is associated with heart attacks. Exercise lowers the amount of low-density cholesterol.

     Heart attacks may be associated with stress , and studies show that exercise decreases your feelings of stress. It also lowers blood pressure, which is another risk factor in heart attacks.

     Q. Specifically , what exercises are best to train the heart?

     A. The sports that are most highly recommended include bicycling, running, jogging, ice skating, roller skating , jumping rope and cross-country skiing. If you can’t get outside, bicycling can be done indoors on a stationary bicycle, and you can do your jogging in place or on a treadmill. The bad thing about such stationary exercise is that they can be boring . You should enjoy exercise.

     But the important thing is to bring your heartbeat up to at least 120 beats a minute. It may surprise you that tennis is not an ideal sport to train your heart—mainly because its action is not continuous. For training your heart, it would take 2 hours of tennis to equal 15 minutes of jogging. Golf is a poor sport for training your heart. So are bowling, walking and weight lifting.

     Q. How about swimming?

     A. Swimming is an excellent exercise if you swim long enough- at least 30 minute each time—and energetically enough. My advice is when swimming to keep as much of your body as possible in the water, and in stroking to get your hands back into the water as fast as you can.

     Q. Is dancing a good exercise?

     A. Aerobic dancing is an excellent exercise. I recommend it for women, because most women don’t like ordinary exercise but like to dance.

     Q. What about disco dancing?

     A. Disco dancing is excellent. If you see young people dancing in a nightclub or discotheque today, you’ll see they are really training their hearts because there is no way they can do that kind of dancing and keep their pulse rates under 120. Square dancing can also be excellent—provided that it’s done continuously and vigorously.

     Q. How late in life should a person do such exercises?

     A. There’s no age limit.

     Q. Isn’t it dangerous for some people to exercise as vigorously as you recommend?

     A. Everyone over 35 should get a stress electrocardiogram—to find out how his or her heat will behave with vigorous exercise . An ordinary electrocardiogram—the kind you usually get in a doctor’s office —only tells you how your heart behaves while you are resting , So ask your physician to measure your heart while you exercise. This will not only tell, with a large degree of probability, whether your heart is sound, but will also indicate how much exercise your heart can tolerate safely and the maximum pulse rate that is safe for you.

(to be continued) Approximately 1,100 words