Smartphone pedometers underestimate steps, but valuable health tool: study

UBC researchers found the iPhone underestimated steps by 21.5 per cent

A recent study looking at iPhone’s built-in pedometers is a step toward using the tool as a clinical intervention in improving people’s health, a University of B.C. researcher said.

Smartphones pose an opportunity for researchers to gather objective data on the public’s health and physical activity but before they can be used, the accuracy of the devices need to be tested, lead author Mark Duncan said in an interview Saturday.

“This was very much a first step to make sure that we understand what the data looks like and how well it represents the actual behaviour,” he said.

The study involved 33 participants testing the phones in regular living conditions and in a lab.

Comparing users’ step count on the iPhone pedometer with an accelerometer worn on their waists in their day-to-day life, the study found the iPhone was underestimating the number of steps by 21.5 per cent or 1,340 steps.

The phones fared better in lab tests where accuracy was within five per cent when users walked at a normal pace.

At a slow pace of only 2.5 kilometres an hour, the accuracy of the phones dropped between 7.6 and 9.4 per cent.

Duncan said the discrepancy is likely due to people forgetting to carry their phones at all times.

“If someone goes off to the washroom or to the kitchen and leaves their phone on their desk, obviously it’s not going to count those steps,” he said.

While the accuracy of the device isn’t strong enough to be a primary research tool, Duncan said the information is valuable for the average user interested in improving their health.

“If your goal is the standard 10,000 steps per day and the phone says you’ve completed that, chances are you’ve done a bit more which is not a bad thing for your health,” he said.

READ: Study finds dogs smarter than cats

READ: UBC ‘sailbot’ found after 18 months at sea

It could also be a tool for physicians to monitor and prescribe more activity to their patients, especially as more Canadians carry smartphones.

“There is quite a lot of research saying physicians want to be able to prescribe more physical activity and help their patients to become more physically active but they lack the time and the tools to do so,” he said. “This is potentially one tool that a health care provider could use to both assess physical activity and tell their patients to use it as a tool to increase their physical activity.”

He said now that researchers understand the accuracy of the devices, they can begin testing whether it’s effective to use smartphone pedometers as a motivational tool to increase a user’s physical activity.

Smartphones could also be used to compliment other studies by providing an indicator of participants’ past level of physical activity. Duncan said a challenge with trials is that some people increase their level of activity because researchers are monitoring them, skewing outcomes, and having that historic data can help flag a change in behaviour.

The study was published last month in the Journal of Sports Sciences.


Like us on Facebook and follow us on Twitter.

Just Posted

Kelowna Family Hub celebrates 10,000th visit

The Central Okanagan Family Hub opened in 2016

Lake Country council questions tax hike for fire hall

Council asked about other options opposed to a 4.9 per cent tax hike

Another 20 to 30 cm of snow expected on Coquihalla

Environment Canada issued a weather statement this morning

Retired Kelowna teacher a YouTube Sudoku sensation

A retired Kelowna teacher has amassed quite the following online by teaching the art of solving a Sudoku puzzle.

VIDEO: Close encounter with a whale near Canada-U.S border

Ron Gillies had his camera ready when a whale appeared Dec. 7

Humboldt Broncos, cannabis, Fortnite: Here are Canadians’ top Google searches for 2018

When celebrities died or Canada Post went on strike, Canada turned to Google

B.C. billionaires worth 5,845 times average middle-income household

Economists argue for changes to Canadian tax system benefitting rich

Condominium market still ‘a lot better’ than normal in Vancouver suburbs

The Fraser Valley, east of Metro Vancouver, has long been considered a more affordable haven for first-time homebuyers.

UN chief returns as climate talks teeter closer to collapse

Predictions from international climate expert, warn that global warming is set to do irreversible environmental damage.

Trump’s willingness to intervene in Meng detention roils Canada’s justification

The International Crisis Group said Tuesday, Dec. 11 it’s aware of reports that its North East Asia senior adviser Michael Kovrig has been detained.

Scientist awarded $100K for work on Arctic contaminants that led to ban

Derek Muir has received the $100,000 Weston Family Prize for his research that showed those carcinogens were able to move into the Arctic.

Manhunt continues for France shooter

Suspected gunman named, had long police record

‘Jurassic Park,’ ‘Shining’ added to National Film Registry

“These cinematic treasures must be protected because they document our history, culture, hopes and dreams.”

Most Read