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

Did you get a flu shot this season?

Weekly web poll for the 100 Mile Free Press

100 Mile House man pleads guilty to second degree murder in death of former girlfriend

Michael Martel admits to violent attack on Vesna Dumpstrey-Soos

100 Mile House Blind Curling team comes in third on home ice

Club will be going to the 2019 Western Blind Curling Association Championship in March

Combination of skiing and yoga is a hit for the 100 Mile House Nordics Club

The club offers a new program where women can night ski together and wind down with yoga

100 Mile House’s Youth Zone to be given a new name and branding

CFEC hoping rebrand will help them with youth engagement

UPDATE: B.C. legislature managers accused of excessive travel, personal expense claims

Clerk Craig James, security chief Gary Lenz call allegations ‘completely false’

B.C. man fined $10,000 after leaving moose to suffer before death

Surrey man was convicted last week on three Wildlife Act charges

‘Blue Monday’ isn’t real, but depression can be

CMHA encourages people to prioritize their mental health

Anti-pipeline group wants NEB to consider impact of emissions, climate change

Stand.earth filed NEB motion asking to apply same standard to the project as it did with Energy East pipeline

Parole granted for drunk driver who killed B.C. RCMP officer

Kenneth Jacob Fenton will be able to attend alcohol abuse treatment, nearly three years after crash that killed Const. Sarah Beckett

B.C. man charged in 2014 snake venom death of toddler

Henry Thomas was taking care of the North Vancouver girl the day before she died

B.C.’s largest public-sector union wants inquiry into money laundering, drugs

Union officials say Premier John Horgan and Attorney General David Eby have not ruled out the possibility of a public inquiry

Teen in confrontation with Native American: I didn’t provoke

Nick Sandmann of Covington Catholic High School said he was trying to defuse the situation

Kamala Harris opens U.S. presidential bid in challenge to Trump

The 54-year old portrayed herself as a fighter for justice, decency and equality in a video distributed by her campaign

Most Read