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Heart rate can predict the risk of sudden death,,

Heart rate during exercise and recovery from exercise may be a successful predictor for risk of sudden deaths//.

Sympathetic and vagal activities balance the changes in heart rate during exercise and recovery period. Researches from France, who carried out the research to find out whether heart rate can predict sudden deaths, are of the opinion that sudden death is more likely to occur if the healthy people tend to have abnormal heart rate profiles during exercise and recovery.

Researchers had looked into the heart beat profile of 5713 asymptomatic working men of ages between 42 and 53 years who had undergone standardized graded exercise testing between 1967 to 1972, and all of them tested negative for cardiovascular disease.

The results of the study showed that death from myocardial infarction was higher in men with a resting heart beat of more than 75 beats per minute, and the risk also becomes higher for men who have a heart rate of more than 89 beats pre minute during exercise. If the heart rate decreases by less than 25 beats per minute after cessation of exercise, then also the chance of having sudden death remains high.

The study was published in the current issue of New England Journal of Medicine.

Reference: New England Journal of Medicine, May 2005
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