奇速英语

凡事物极必反，请不要运动过量！

We’re constantly being told that exercise is good for our health and can protect against a host of diseases. But a new study suggests you really can have too much of a good thing - especially if you’ve already got a weak heart.

Researchers have recognized a so-called cut-off point where exercise loses its protective effect and becomes dangerous.

Heart attack survivors who ran fewer than 30 miles a week - or walked fewer than 46 miles - were 65 per cent less likely to die from another heart-related events. But exercising too much, specifically running more than 4.4 miles a day or walking swiftly for over 6.6 miles a day, increased the risk of another heart attack.

The study, found “clear evidence” of an increase in deaths among heart attack survivors who exercise too much. In the study, the relationship between exercise and heart disease-related deaths in about 2,400 physically active heart attack survivors was examined. The study confirmed（确定）previous reports indicating that the heart-health benefits of running and walking were the same - providing（假如）people knew it takes twice as long to burn the same number of calories when walking.

Responding to the research, Amy Thompson, Senior Cardiac Nurse at the British Heart Foundation, said: “We’re often told how beneficial physical activity is for our heart health. However, this study suggests if you’ve had a heart attack you may be putting yourself at risk of another if you participate in vigorous（剧烈的）exercise above the recommended amounts - such as running for more than 30 miles per week.”

Senior investigator Dr Alejandro Lucia, of the European University Madrid, said: “What we found on the evidence available was that best athletes, mostly men, live longer than the general population. It suggests that the beneficial health effects of exercise, particularly in reducing cardiovascular（心脑血管的）disease and cancer risk, are not necessarily limited to moderate amount.”