Maintenance Notice

Due to necessary scheduled maintenance, the JMIR Publications website will be unavailable from Monday, March 11, 2019 at 4:00 PM to 4:30 PM EST. We apologize in advance for any inconvenience this may cause you.

Who will be affected?


Currently submitted to: JMIR mHealth and uHealth

Date Submitted: May 29, 2019
Open Peer Review Period: Jun 3, 2019 - Jul 18, 2019
(closed for review but you can still tweet)

NOTE: This is an unreviewed Preprint

Warning: This is a unreviewed preprint (What is a preprint?). Readers are warned that the document has not been peer-reviewed by expert/patient reviewers or an academic editor, may contain misleading claims, and is likely to undergo changes before final publication, if accepted, or may have been rejected/withdrawn (a note “no longer under consideration” will appear above).

Peer-review me: Readers with interest and expertise are encouraged to sign up as peer-reviewer, if the paper is within an open peer-review period (in this case, a “Peer-Review Me” button to sign up as reviewer is displayed above). All preprints currently open for review are listed here. Outside of the formal open peer-review period we encourage you to tweet about the preprint.

Citation: Please cite this preprint only for review purposes or for grant applications and CVs (if you are the author).

Final version: If our system detects a final peer-reviewed “version of record” (VoR) published in any journal, a link to that VoR will appear below. Readers are then encourage to cite the VoR instead of this preprint.

Settings: If you are the author, you can login and change the preprint display settings, but the preprint URL/DOI is supposed to be stable and citable, so it should not be removed once posted.

Submit: To post your own preprint, simply submit to any JMIR journal, and choose the appropriate settings to expose your submitted version as preprint.

Improving Pacific adolescents’ physical activity towards international recommendations: exploratory study of a digital education app coupled with activity trackers

  • Olivier GALY; 
  • Kalina YACEF; 
  • Corinne CAILLAUD


The prevalence of overweight and obesity in children and adolescents has dramatically increased in the Pacific region over the last decade. Childhood overweight and obesity are likely to lead to noncommunicable diseases (NCDs) in adulthood. A major contributing factor to the rising prevalence is the insufficient amount of daily moderate to vigorous physical activity (MVPA). In the Pacific region, less than 50% of children and adolescents meet the recommendations of 11000 steps and 60 minutes of MVPA per day. Whilst studies have shown the potential of digital technologies to change behaviours, none has been proposed to guide adolescents towards achieving these international recommendations.


We propose a technology-supported educational program that includes objective measures of physical activity (PA) components and self-assessment of goal achievement, helps Pacific adolescents to meet the international PA recommendations. We also created data-mining techniques to provide a more detailed analysis of PA behaviour changes.


Twenty-four adolescents, 12-14 years old, participated in a 4-week program comprising eight 1-hour modules to develop health literacy and physical skills. This self-paced user-centred program was delivered via an app and provided learning content and goal-setting and self-assessment tasks. PA performed during the 4-week program was captured with an activity tracker to support learning and help the adolescents self-assess their achievements against personal goals. The data were analysed using a consistency rate and daily behaviour clustering to reveal any PA changes, particularly regarding adherence to international recommendations.


The consistency rate of daily steps revealed that the adolescents reached 11,000 steps per day 48.1% of the time in the first week of the program (~3.4 days per week) and this peaked at 59% (~4.1 days per week) toward program end. PA showed an overall increase during the program, particularly in the less active adolescents, who increased their daily steps by 15.6% and ultimately reached 11,000 steps more frequently. The consistency of daily behaviour clustering showed a 27% increase in adherence to international recommendations in the least active adolescents.


Technology-supported educational programs that include self-monitored PA via activity trackers can be successfully delivered to adolescents in schools in remote Pacific areas. New data-mining techniques enable innovative analyses of PA engagement based on the international recommendations.


The protocol was approved by the ethics committee of the University of New Caledonia and the consultative ethics committee for New Caledonia (CEC-NC03-2016).


Please cite as:


Improving Pacific adolescents’ physical activity towards international recommendations: exploratory study of a digital education app coupled with activity trackers

JMIR Preprints. 29/05/2019:14854

DOI: 10.2196/preprints.14854


The author of this paper has made a PDF available, but requires the user to login, or create an account.

© The authors. All rights reserved. This is a privileged document currently under peer-review/community review (or an accepted/rejected manuscript). Authors have provided JMIR Publications with an exclusive license to publish this preprint on it's website for review and ahead-of-print citation purposes only. While the final peer-reviewed paper may be licensed under a cc-by license on publication, at this stage authors and publisher expressively prohibit redistribution of this draft paper other than for review purposes.