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

Impaired driver crashes into Victoria police vehicle, injures officer

Cook Street collision occured in the early morning hours of Tuesday

Get ready for the 39th annual Goodlife Fitness Victoria Marathon

Up to 9,000 particpants are anticipated for this year’s three-day race weekend

Victoria police say explicit calls continue to target women

Over 50 reports of unwanted, sexually explicit calls have come in

Plaque that replaced Macdonald statue at Victoria city hall vandalized

Less than 24 hours after plaque was installed, an ‘X’ had been scratched through the centre

Weekend collisions keep West Shore RCMP busy

Officers responded to three separate incidents within the span of one hour

Average Canadian family spends 43% of income on taxes: study

Fraser Institute’s consumer report shows taxes accounting for larger chunk of income each year

RCMP to search for body after man drowns in B.C.’s Buntzen Lake

Officers and fire crews responded but the man from the Lower Mainland is believed to have drowned.

Police chiefs call for stricter controls on pill presses to fight opioids

Canada’s police chiefs are urging Ottawa to beef up its fight against the opioid scourge by closely vetting people who import pill presses

Greater Victoria Crime Stoppers wanted list for the week of Aug. 14

Greater Victoria Crime Stoppers is seeking the public’s help in locating the… Continue reading

‘It’s like a party in your mouth’

B.C. creator’s Milkshake Burger makes its debut at the PNE

Vehicle catches fire near Vancouver Island provincial park

Fire shut down Highway 4 in both directions

Get involved in the Great Canadian Bumble Bee Count

Environmental organization develops app to help with the nationwide count

Most Read