Validity of the apple iPhone®/iPod Touch® as an accelerometer-based physical activity monitor: A proof-of-concept study

Meaghan Nolan, Joseph Ross Mitchell, Patricia K. Doyle-Baker

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Background: The popularity of smartphones has led researchers to ask if they can replace traditional tools for assessing free-living physical activity. Our purpose was to establish proof-of-concept that a smartphone could record acceleration during physical activity, and those data could be modeled to predict activity type (walking or running), speed (km•h-1), and energy expenditure (METs). Methods: An application to record and e-mail accelerations was developed for the Apple iPhone®/iPod Touch®. Twentyfive healthy adults performed treadmill walking (4.0 km•h -1 to 7.2 km•h-1) and running (8.1 km•h -1 to 11.3 km•h-1) wearing the device. Criterion energy expenditure measurements were collected via metabolic cart. Results: Activity type was classified with 99% accuracy. Speed was predicted with a bias of 0.02 km•h-1 (SEE: 0.57 km•h-1) for walking, -0.03 km•h-1 (SEE: 1.02 km•h-1) for running. Energy expenditure was predicted with a bias of 0.35 METs (SEE: 0.75 METs) for walking, -0.43 METs (SEE: 1.24 METs) for running. Conclusion: Our results suggest that an iPhone/iPod Touch can predict aspects of locomotion with accuracy similar to other accelerometer-based tools. Future studies may leverage this and the additional features of smartphones to improve data collection and compliance.

Original languageEnglish (US)
Pages (from-to)759-769
Number of pages11
JournalJournal of Physical Activity and Health
Volume11
Issue number4
DOIs
StatePublished - 2014

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Touch
Malus
Running
Walking
Exercise
Energy Metabolism
Postal Service
Locomotion
Compliance
Research Personnel
Equipment and Supplies
Smartphone

Keywords

  • Energy expenditure
  • Free-living physical activity
  • Smartphone

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Validity of the apple iPhone®/iPod Touch® as an accelerometer-based physical activity monitor : A proof-of-concept study. / Nolan, Meaghan; Mitchell, Joseph Ross; Doyle-Baker, Patricia K.

In: Journal of Physical Activity and Health, Vol. 11, No. 4, 2014, p. 759-769.

Research output: Contribution to journalArticle

Nolan, Meaghan ; Mitchell, Joseph Ross ; Doyle-Baker, Patricia K. / Validity of the apple iPhone®/iPod Touch® as an accelerometer-based physical activity monitor : A proof-of-concept study. In: Journal of Physical Activity and Health. 2014 ; Vol. 11, No. 4. pp. 759-769.
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