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In the world of step goals and activity trackers, the number 10, can sound like a magic one. Many wearable devices that track the number of steps a person takes each day come pre-programmed with a daily goal of 10, steps. But while a large body of evidence shows that physical activity is good for a person's health and longevity, few studies have examined how many steps a day are associated with good health, particularly long-term health outcomes. A new study led by investigators from Brigham and Women's Hospital sought to address this knowledge gap by examining outcomes over an average of more than four years for older women in the Women's Health Study who had measured their steps for a full week.
The team reports that, among older women, taking as few as 4, steps per day was significantly associated with lower risk of death compared to taking 2, steps per day. Risk of death continued to decrease with more steps taken but leveled off at around 7, steps per day -- less than the 10, steps default goal in many wearables. According to previous studies, the average number of steps taken by people in the U.
The origin of the 10,step goal is unclear but may trace back to , when a Japanese company began marketing a pedometer called Manpo-kei, which translates to "10, steps meter" in Japanese.
To conduct their study, Lee and colleagues included participants from the Women's Health Study, a randomized trial originally conducted to evaluate risk of cardiovascular disease and cancer among women taking low-dose aspirin and vitamin E.