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How active is your country? Smartphone data reveals the answer
We all know the path to better health does not involve long periods of inactivity, yet we still eat too much and exercise too little.
The World Health Organization (WHO) estimates almost 2 billion adults – more than a quarter of the global population – are overweight or obese.
And our smartphones are now providing researchers with a clearer picture of how much exercise we’re doing – or not doing.
Using data amassed from hundreds of thousands of phones worldwide, researchers at Stanford University have discovered huge variations in the average activity levels of different nations.
Hong Kong tops the steps
Residents of Hong Kong SAR did the most exercise, averaging 6880 steps a day, almost twice as much as sedentary Indonesia, at the bottom of the table with 3513.
The researchers analyzed 68 million days’ worth of anonymous data from more than 700,000 people pulled from the step-counting app Argus.
Other countries that fared badly included Saudi Arabia and Malaysia, whose citizens did fewer than 4000 steps a day on average (10,000 steps a day is a target acknowledged by health bodies around the world).
Activity inequality
However, the researchers found it’s not a country’s average number of steps that is the biggest factor shaping obesity levels. Instead it appears to be “activity inequality”.
In short, if there is a large divide between the fittest and the laziest, a country is more likely to have high obesity levels.
For example, in Sweden, where there was little difference in the number of steps taken by the most and least active people, obesity rates are very low.
Meanwhile, the US and Mexico both have similar average step counts, but in the US, which has higher obesity levels, there was a far greater divide between those who exercised and those who didn’t.
In the five countries with the highest levels of activity inequality, individuals are 196% more likely to be obese than in the five countries where inequality is lowest.
The gender divide
Much of this activity inequality is driven by uneven levels of exercise taken by men and women in different countries. In Japan, men and women exercised to roughly the same degree; the country has low levels of both inequality and obesity.
Compare this with Saudi Arabia, where much of the activity inequality results from the low levels of exercise done by women compared to men.
The study is the latest to capitalize on the vast quantities of data available through smartphones, and is far more extensive than previous research in this area. Researchers hope that insights from this data will help us to find new ways of tackling the obesity crisis.
For example, the team also analyzed how easy 69 US cities were to navigate on foot, and unsurprisingly found a strong correlation between activity levels and ease of walking. They suggest this data could be used to support the development of cities that promote physical activity.
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