The higher your daily step count, the lower your risk of death per year, according to a new analysis by the US National Cancer Institute 鈥� but the link only goes so far.
Public health officials have long encouraged walking as a way of improving general health, but many longitudinal studies on its benefits have focused on people in their early 60s and have sometimes ignored minority groups, such as people who aren鈥檛 white.
The new analysis looked at 4840 people who were representative of the US population over the age of 40. Between 2003 and 2006, Pedro Saint-Maurice at the National Cancer Institute and his colleagues asked the participants to wear an accelerometer for a week.
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鈥淲e know that measuring a person鈥檚 activity over seven days is a fairly good gauge of their usual activity,鈥� says Saint-Maurine, because have used a similar methodology.
The team found that the average daily step count of this group was 9124 steps. This figure is higher than many previous studies have found, probably because the study included younger people, those working in less sedentary jobs, and more men, .
The researchers used the US National Death Index to determine which participants had died by the end of 2015. The researchers used 4000 steps a day as their baseline, because this is easily achieved by someone who drives to work and sits at their desk for the whole day.
By comparison, the team found that taking 8000 steps was associated with a 51 per cent lower risk of dying per year, and taking 12,000 daily steps was associated with a 65 per cent lower risk of dying per year.
But taking more than 12,000 steps a day didn鈥檛 seem to be associated with a further reduction of risk of yearly mortality. 鈥淚t just kind of plateaus,鈥� says Saint-Maurice. Up until 12,000 steps, a higher number of steps was associated with a lower risk of dying per year regardless of sex, race, level of education, health condition and whether a person smoked or drank alcohol.
The researchers also found that the intensity of the steps taken had little to no effect on the risk of yearly mortality. 鈥淲e hope there are more studies on this in the context of daily life,鈥� says Saint-Maurice.
鈥淢any individuals wear wearables and monitor their step count but there is a critical gap in knowledge between the relation of steps and health outcomes,鈥� says I-Min Lee at Harvard University. This study corroborates and expands on previous research, she says. 鈥淚t provides empirical data extending these findings to other groups of people.鈥�
JAMA
