Fitness trackers are not reliable for all activities

Related Posts

  • Top 5 fitness myths fitness science muscles diet exercise5 FITNESS MYTHS THAT WON’T GO AWAY

    You have surely heard some of them before – there is something special about them – they simply won’t go away. If you’re new to dieting, it’s easy to fall for the myths. Fitness myths Read more…

  • Mental health and being overweight

    I am currently doing my psychiatry rotations, and I am SHOCKED to see how depression and anxiety ruins peoples’ lives. Keep in mind that I’m talking about CLINICAL depression and anxiety. This is NOT the Read more…

  • What is good posture?

    What is good posture? “Keep your spine neutral”, “tuck your shoulder blades”, “avoid butt wink”. These advice stem from classic physiotherapy looking for the position in which weight is evenly distributed across the body, so Read more…

  • The danger of sitting too long

    Did you know that 5 MILLION people die each year because of physical INACTIVITY? (1) Current recommendations are 75-150 min cardio and 2 weight training sessions per week. How can we help people get there? Read more…

Fitness trackers Omar Kaakati

Wearable fitness trackers are becoming increasingly popular as a means of tracking physical activity, heart rate and even sleep patterns. Studies show some surprising facts about the reliability of these devices. A review of 22 studies on fitness trackers found that step counting was most reliable, while using the devices to measure energy expenditure and sleep was less reliable. Another study on seven healthy subjects compared various brands of fitness trackers, with repeated experiments of walking, jogging on a treadmill and walking up/down stairs.

Average accuracy for steps counted in these activities was 97.2% (varying from 92.4 – 99.9%), average repeatability was less impressive at 0.79 (varying from 0.55 – 0.89). When comparing with energy expenditure measured by a portable metabolic response breathing device, there was on average 10-15% error in energy expenditure estimation. For sleep tracking, studies on adolescents shows good agreements with polysomnography for certain devices. Heart rate monitoring becomes less accurate during vigorous activity.

Summary

Thus it is difficult to say whether a certain device is reliable or not, since they all use varying hardware and software algorithms to make estimations. A trial investigating the effects of fitness trackers on dieting found that a group given fitness trackers lost LESS weight compared to a group who just tracked their results on a computer. Therefore you should be very skeptical to the numbers collected from your fitness tracker, but you can always use RELATIVE changes in the numbers to assess if you are more or less active than usual.

Sources:

Lee, Jung-Min. Issue: Volume 46(9), September 2014, p 1840–1848.

Kelly R. Evenson. Int J Behav Nutr Phys Act. 2015; 12: 159.

Stay Updated

With the latest science updates. We don’t spam! 

By clicking on subscribe you agree to our Privacy PolicyTerms & Condititions