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Pollution Could Cancel Out the Health Benefits of Walking, a New Study Says

From TIME - December 5, 2017

Simple though it may be, walking is one of the best things you can do for your body. Research has shown that it can extend your life and improve your heart health, along with a host of other health metrics.

A new study published in the Lancet, however, suggests that where you walk matters. Strolling along heavily polluted streets, researchers found, may actually cancel out many of the benefits associated with walking.

A team of researchers recruited 119 people over age 60. Of these, 40 were healthy; 40 had chronic obstructive pulmonary disease (COPD), an inflammatory lung disease; and 39 had ischemic heart disease, which is caused by a narrowing of the arteries.

Some of the people were instructed to walk for two hours per day along Londons Oxford Street, a downtown thoroughfare heavily trafficked by buses and cars, while the others spent the same amount of time walking through a quiet part of the citys Hyde Park. Three to eight weeks later, the groups swapped routes. After each outing, researchers measured pollutant concentrations in each environment, along with a number of health markers in the participants, including lung capacity, breathlessness, wheezing, coughing and arterial stiffness, which is related to high blood pressure.

After walking through Hyde Park, the healthy people saw big improvements in their lung capacity and arterial stiffness. But after walking along Oxford Streetand breathing in a number of airborne pollutantspeople saw only modest improvements in lung capacity and a worsening of arterial stiffness, suggesting that the air quality nullified many of walkings health benefits, according to the paper.

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