Air pollution cancels the benefits of outdoor physical exercise
To find that out, researchers at the Seoul National University College of Medicine in South Korea conducted a country-wide study of nearly 1.5 million young adults. The study, published in the European Heart Journal, concluded that strenuous exercise in very polluted air could put young people at risk for heart disease and stroke. This is an important result suggesting that, unlike middle-aged people over 40, excessive physical activity may not always be beneficial for cardiovascular health in younger adults when they are exposed to high concentrations of air pollution.
The researchers found that among people exposed to high levels of PM2.5, those who increased their exercise between the two screening periods had a 33% increased risk of cardiovascular disease during the follow-up period compared to those who were physically inactive and did not increase their exercise, although this result was slightly weaker than that needed to achieve statistical significance.
This means an extra 108 people per 10,000 might develop the cardiovascular disease during the follow-up period.
Ultimately, it is imperative that air pollution is improved at the national level in order to maximize the health benefits of exercising in young adults, who tend to engage in physical activity more than other age groups while their physical ability is at its best. If air quality is not improved, this could result in the incidence of cardiovascular diseases actually increasing despite the health benefits gained from exercise. (source: ecowatch.com)
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