CClinicalTrials.gg
Status unknownNCT05115253Updated Dec 23, 2021

Reducing Sedentary Behaviour in Office Workers With a HAPA mHealth Intervention and a Just In-Time Adaptive Intervention

An interventional study of HAPA behavioural counselling + SMS text message boosters and JITAI in Sedentary Behaviour and Health Behaviour Change, sponsored by Western University, Canada. Status unknown at 1 site in Canada. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2021-12-23.

Sponsored by Western University, Canada · Not applicable, Interventional, and Treatment

The sponsor has not verified this record recently (last verified Dec 2021), so the status shown — last known as Not yet recruiting — may be out of date.
Phase
Not applicable
Study type
Interventional
Enrollment
93
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

This study will explore the effectiveness of two different interventions, a Health Action Process Approach (HAPA) mobile health (mHealth) intervention and a Just In-Time Adaptive Intervention (JITAI), on reducing sedentary behaviour in office workers. One third of participants will receive the mHealth HAPA intervention, consisting of a theory-driven behavioural counselling session with personalized daily SMS text messages, and another third of participants will receive the JITAI intervention, a behaviour tracking mobile phone application that will alert participants once a set sedentary behaviour condition has been met. The last third of participants will act as a control where they will not receive an intervention or any further information from the letter of information. The study will take place over four weeks, with the first acting as a baseline and the intervention period filling the latter three weeks.

Read the detailed description

This three-arm repeated measure randomized control trial will randomize participants into two intervention groups and one control group to attempt to reduce sedentary behaviour in office workers. The study will last for four weeks, the first week of the study will be used for baseline measurement and the remaining three weeks used for the intervention.

Participants will be full time office workers primarily recruited from large businesses and corporations. The primary purpose of the study will be to decrease sedentary behaviour in office workers from pre- to post-intervention by breaking up extended periods of sedentary time. The secondary objectives of the study are to compare the effectiveness of each group against one another to assess for any significant differences in sedentary behaviour profiles, total time spent sitting, break frequency, break duration, and time not spent sedentary as well as to examine whether physical activity changed over the course of the intervention.

One intervention group will attempt to reduce sedentary behaviour by receiving push notifications from an EMA tracking mobile phone application after a pre-set sedentary behaviour condition has been met. The application will monitor and collect data from the on-board accelerometer of the participant's phone and when a threshold of 30 consecutive sedentary minutes has been reached, the application will administer a notification asking the participant to break the extended sedentary behaviour they are currently engaged in.

The other intervention group will receive a theory-based behaviour change counselling session paired with daily personalized SMS text message boosters to achieve the study's aims. The counselling sessions and SMS text messages will be framed through the Health Action Process Approach, a behaviour change model that centres around action planning and coping planning. The control group will receive no intervention or further information from the letter of information.

Sedentary behaviour will be collected in the form of duration of time spent sitting, frequency of sedentary behaviour breaks, and duration of sedentary behaviour breaks. These variables will be measured through an EMA tracking mobile phone application that will be downloaded by each participant as well as a weekly online sedentary behaviour questionnaire. Outcome measures will be compared within and between groups to detect differences.

02

Conditions studied

  • Sedentary Behaviour
  • Health Behaviour Change

Keywords

  • Sedentary Behaviour
  • Health Behaviour Change
  • HAPA
  • Health Action Process Approach
  • JITAI
  • Just In-Time Adaptive Intervention
  • Office Workers
03

In context

Lead sponsor

Western University, Canada is the lead sponsor of 221 studies on the registry; 56 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • 18 years of age or older
  • full-time employee in a desk-based office job (work from home accepted)
  • have access to a mobile phone with internet connection
  • can read and write in English

Exclusion criteria

Exclusion Criteria:

  • any medical or physical limitation that would prevent standing, stretching, and/or light physical activity
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
93 participants (estimated)

Study arms

  • Experimental
    mHealth HAPA Intervention Group

    This intervention group will receive a single one-on-one online behavioural counselling session and daily personalized SMS text message boosters with the aim of increasing the breaking of consecutive work related sedentary behaviour. Counselling strategies will be grounded in the HAPA model, specifically focusing on the creation of an action plan and the development of coping strategies to increase sedentary behaviour breaks. The SMS text message boosters will be personalized based on participant's preferences of timing, type, frequency, and length. The boosters will framed through HAPA principles with content focusing on risk awareness, outcome expectancy, action and coping planning, barriers and resources, and self-efficacy. The intervention will last for three weeks.

    Behavioral: HAPA behavioural counselling + SMS text message boosters

  • Experimental
    JITAI Group

    This intervention group will receive push notifications from a EMA behaviour monitoring mobile application that will be downloaded to each participants' mobile phones. The application will measure and monitor a participant's sedentary behaviour and once a pre-set condition of 30 consecutive sedentary minutes has been reached, the application will administer a push notification notifying the participant to break their sedentary behaviour. The push notifications will ask the participants to stand up, stretch, or lightly walk around to break their current behaviour. The intervention will last for three weeks.

    Device: JITAI

  • No intervention
    Control Group

    The control group will receive no intervention or further instruction past the letter of information.

Interventions

  • BehavioralHAPA behavioural counselling + SMS text message boosters

    Behavioural counseling grounded in the Health Action Process Approach (HAPA; i.e., action planning and coping planning) paired with daily personalized HAPA guided SMS text message boosters to reduce consecutive workplace sedentary behaviour.

  • DeviceJITAI

    EMA monitoring mobile phone application that uses a phone's on-board accelerometer to monitor a participant's sedentary behaviour and deliver a push notification once a set condition has been met. This intervention will be utilized to reduce consecutive workplace sedentary behaviour.

    Also known as: mEMA (ilumivu Inc., Boston, MA, www.ilumivu.com)

06

What researchers measure

Primary outcomes

  1. Changes in Frequency of Breaks from Sitting at Work

    mEMA app (ilumivu Inc., Boston, MA, www.ilumivu.com); accelerometer data Modified version of the SIT-Q 7d (Wijndaele et al., 2014; Sui \& Prapavessis, 2016); 1-item; 12-point scale

    Time frame: Baseline, Weeks 2, 3, 4

  2. Changes in Duration of Breaks from Sitting at Work

    mEMA app (ilumivu Inc., Boston, MA, www.ilumivu.com); accelerometer data Modified version of the SIT-Q 7d (Wijndaele et al., 2014; Sui \& Prapavessis, 2016); 1-item; 10-point scale

    Time frame: Baseline, Weeks 2, 3, 4

  3. Changes in Time Spent Sitting at Work

    mEMA app (ilumivu Inc., Boston, MA, www.ilumivu.com); accelerometer data Modified version of the SIT-Q 7d (Wijndaele et al., 2014; Sui \& Prapavessis, 2016)

    Time frame: Baseline, Weeks 2, 3, 4

  4. Changes in Time Spent Standing at Work

    mEMA app (ilumivu Inc., Boston, MA, www.ilumivu.com); accelerometer data

    Time frame: Baseline, Weeks 2, 3, 4

  5. Changes in Time Spent Engaged in Light Physical Activity at Work

    mEMA app (ilumivu Inc., Boston, MA, www.ilumivu.com); accelerometer data

    Time frame: Baseline, Weeks 2, 3, 4

Other outcomes

  1. Age

    Assessed with a single item question: "What is your age?"

    Time frame: Baseline

  2. Sex

    Assessed with a single item question: "What is your sex?"

    Time frame: Baseline

  3. Gender

    Assessed with a single item question: "What gender do you most identify with?"

    Time frame: Baseline

  4. Ethnicity

    Assessed with a single item question: "What ethnicity do you most identify with?"

    Time frame: Baseline

  5. Height

    Assessed with a single item question: "What is your height in either inches or centimetres?"

    Time frame: Baseline

  6. Weight

    Assessed with a single item question: "What is your weight in either pounds or kilograms?"

    Time frame: Baseline

  7. Work Environment

    Assessed with a three item question: "What is your current work environment?"; in office, at home, hybrid

    Time frame: Baseline

  8. Type of Occupation

    Assessed with a four item question: "What general sector does your occupation fall under?"; private, public, charity, other

    Time frame: Baseline

  9. Hours of Work per Week

    Assessed with a single item question: "What are your typical hours of work on an average week?"

    Time frame: Baseline

  10. Education Level

    Assessed with a single item question: "What is your current formal education level?"

    Time frame: Baseline

07

Study locations

1 site
  • The University of Western Ontario
    London, Ontario, Canada
    • Harry Prapavessis, PhD · Contact
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Dec 23, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT05115253
Lead sponsor
Western University, Canada
Responsible party
Dr. Harry Prapavessis (Professor, Western University, Canada) — Principal investigator
First posted
Nov 10, 2021
Start date
Dec 2021 (estimated)
Primary completion
Mar 2022 (estimated)
Completion
Jun 2022 (estimated)
Last update
Dec 23, 2021

Study contacts

Harry Prapavessis, Ph.D
Contact
hparapave@uwo.ca
519 661-2111 ext. 80173
Brett Carter, B.Sc
Contact
bcarte5@uwo.ca
4036172469
Harry Prapavessis, Ph.D
principal investigator · Western University

Oversight

FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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