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- $Unique_ID{BRK01172}
- $Pretitle{}
- $Title{Is Exercise Good for the Blood?}
- $Subject{exercise blood risk factors pressure cholesterol hemoglobin platelet
- fibrinolysis thrombosis arteries plasma fibrinolysis aerobic lifestyle
- lifestyles exercising exercises platelets}
- $Volume{D-23,D-7}
- $Log{
- Blood Sample After Separation*0002101.scf
- Exercise Increases HDL*0002703.scf
- Exercise Lowers Triglycerides and Raises HDL*0003203.scf
- Exercise Improves Circulation*0003207.scf
- Types of Ischemic Strokes I*0006901.scf}
-
- Copyright (c) 1991-92,1993 Tribune Media Services, Inc.
-
-
- Is Exercise Good for the Blood?
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-
- QUESTION: My boy friend claims that his exercise program is good for his
- blood. Is it possible that there are changes that are caused by his physical
- activity which may be considered to be of benefit to him?
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-
- ANSWER: Regular exercise does cause several changes in your blood, but these
- are helpful ones. As you know, regular exercise reduces the risk of a heart
- attack by lowering blood pressure, reducing body fat and blood cholesterol
- levels, and making the heart more efficient. The change that occur to the
- blood may also have a role in helping protect the heart.
- The major exercise-related changes in blood are a decrease in hemoglobin
- concentration, a decrease in platelet activity, and an increase in
- fibrinolysis. These changes appear to reduce the risk of thrombosis, the
- formation of a clogging blood clot within a blood vessel. A heart attack is a
- blood clot within one of the arteries supplying the heart, so any reduction in
- the risk of thrombosis is a lessening of the risk of heart attack.
- While a decrease in the concentration of hemoglobin in athletes sounds
- like bad news, it is not due to a shortage of red blood cells, but to an
- increase in the amount, or volume, of blood plasma, the liquid portion of
- blood. This increase in plasma volume is a good sign of aerobic fitness.
- Increased plasma volume makes blood less viscous, which may decrease the risk
- of thrombosis. Any reduction in oxygen-carrying capacity is offset by
- increased heart efficiency and sweating during exercise. The drop in
- hemoglobin concentration is sometimes called "athletes' anemia" or
- "pseudoanemia," but these are misnomers.
- Regular exercise also appears to decrease the aggregation of platelets,
- the cells within blood that forms clots. Platelet aggregation is the first
- step in the formation of a blood clot. This effect may also decrease the risk
- of thrombosis and may reduce the risk of heart attack.
- The third way that exercise changes the blood is by activating
- fibrinolysis, the body's way of getting rid of old blood clots. This increase
- in fibrinolysis is greatest in those that exercise most, and so people who are
- the most physically fit appear to dissolve clots faster than those who are
- less fit.
- The key to all this is regular exercise, especially aerobic exercise such
- as running, cycling, brisk walking, or aerobic dancing. The word "regular"
- cannot be stressed enough. To get the benefits of exercise, you must do it
- for at least a half an hour and at least three times a week.
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- ----------------
-
- The material contained here is "FOR INFORMATION ONLY" and should not replace
- the counsel and advice of your personal physician. Promptly consulting your
- doctor is the best path to a quick and successful resolution of any medical
- problem.
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-