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

Achieving for Delta could implement big changes with council majority, school board votes

George Harvie gained strong support from North Delta voters on Oct. 20

Mayoral results from across B.C.

Voters in 162 municipalities in B.C. set to elect mayor, council, school board and more

White Rock Computer Club teaches the way of the future

From cat memes to security, the club has been teaching internet for the past 20 years

UPDATED: George Harvie wins race for Delta mayor

Harvie’s Achieving for Delta slate also took 4 of 6 seats on council and 3 of 7 seats on school board

White Rock mayor-elect to focus on water, communication, OCP

Mayor-elect Darryl Walker says he doesn’t drink White Rock’s tap water

Tommy Chong says cannabis legalization makes him proud to be a Canadian

Legendary marijuana advocate and comedian celebrates cultural milestone at Kelowna event

AP Exclusive: Stephen Hawking’s wheelchair, thesis for sale

The online auction features 22 items from Hawking, including his doctoral thesis on the origins of the universe, with the sale scheduled for 31 October and 8 November.

In Khashoggi case: Saudi calls, ‘body double’ after killing

Saudi Crown Prince Mohammed bin Salman called the son of Jamal Khashoggi, the kingdom announced early Monday, to express condolences for the death of the journalist killed at the Saudi Consulate in Istanbul by officials that allegedly included a member of the royal’s entourage.

Alleged serial killer Bruce McArthur waives right to preliminary hearing

Bruce McArthur, a 67-year-old self-employed landscaper, has been ordered to stand trial on eight counts of first-degree murder.

N.B. village faces backlash after council raises ‘straight flag’

Chipman Mayor Carson Atkinson says the flag met the village council’s criteria because it “recognizes, accepts and respects the rights of individuals under the Charter of Rights and Freedoms.”

5 to start your day

Surrey’s new mayor has big promises to keep, a crash claims a life of Fraser Valley man

B.C. oncologist changing the face of breast cancer treatment

Dr. Juanita Crook, a Kelowna oncologist, has seen 100 per cent success using brachytherapy to treat breast cancer in some patients.

Canada Post strikes leaves small shops in the lurch as holidays approach: CFIB

Rotating strikes began in Victoria, Edmonton, Halifax and Windsor

Three strong earthquakes reported off Vancouver Island

The quakes, all measuring more than 6.0 on the richter scale, were about 260 kilometres west of Tofino

Most Read