Actively Recruiting
Effects of Wearable Device Functions and Health Coaching on Movement Behaviours and Cardiometabolic Risk Factors in Adults With Central Obesity: a Randomized Controlled Trial
Led by The University of Hong Kong · Updated on 2026-02-02
133
Participants Needed
1
Research Sites
30 weeks
Total Duration
On this page
AI-Summary
What this Trial Is About
Researchers are evaluating the effects of wearable device functions alone and combined with health coaching on movement behaviors and cardiometabolic risk factors in adults aged 40 years or older with central obesity. This randomized controlled trial involves 133 adults and aims to determine whether combining wearable technology with health coaching improves physical activity, sleep, and cardiometabolic health more than no intervention or wearable device use alone. Participants are randomly assigned to one of three groups: a control group continuing their usual lifestyle without a Fitbit device, a group using a Fitbit device with functions for step and sleep goal setting, activity prompts, and social community features, and a group using the Fitbit device plus receiving a structured lifestyle coaching program based on the U.S. CDC National Diabetes Prevention Program. The coaching includes at least 22 sessions over a year covering risk factor education, goal setting, self-monitoring, support strategies, and progress reviews. Participants visit the research lab three times: at the start, after the 12-month intervention, and at 6-month follow-up. Assessments include physical measurements, questionnaires, and blood samples to analyze cardiometabolic markers. Movement behaviors are measured using an Axivity AX6 accelerometer worn for seven days at baseline and post-intervention, alongside data from Fitbit devices. Researchers monitor adherence through device data and weekly reminders. Participants completing all assessments receive a supermarket voucher as a token of appreciation.
CONDITIONS
Brief Title
Effects of Wearable Device Functions and Health Coaching on Device-measured Movement Behaviours and Cardiometabolic Risk Factors in Adults With Central Obesity
Who Can Participate
Eligibility Criteria
You may qualify if you...
- Age 40 years or older
- Central obesity defined as waist circumference at least 90 cm for men and 80 cm for women
- Insufficient physical activity based on World Health Organization guidelines
- Physical activity assessed using the International Physical Activity Questionnaire - Short Form
- Ownership of a smartphone
- Able to read and understand English or Chinese
You will not qualify if you...
- Unable to perform daily-life activities based on the Physical Activity Readiness Questionnaire
- Participation in another lifestyle-change intervention study
AI-Screening
AI-Powered Screening
Complete this quick 3-step screening to check your eligibility
Your Study Journey
Duration - 2 to 4 weeks
Participants are screened for eligibility to participate in the trial.
1 visit (in-person)
Duration - Approximately 12 months
Participants receive and use a Fitbit wearable device with functions that support self-monitoring, goal setting, prompts, feedback, and social support related to physical activity and sleep.
Ongoing use with periodic check-ins as scheduled by the study
Duration - Approximately 12 months
Participants in the coaching arm participate in a structured lifestyle coaching program including at least 22 sessions focused on cardiometabolic risk factors, goal setting, self-monitoring, and behavior strategies.
At least 22 coaching sessions over 12 months
Duration - At 12 months post-intervention
Participants are assessed for changes in movement behaviors and cardiometabolic risk factors at the end of the intervention period.
1 visit (in-person) for final assessments
Trial Site Locations
Total: 1 location
1
Exercise Physiology Lab, The University of Hong Kong
Hong Kong, Hong Kong
Actively Recruiting
Research Team
Y
Youngwon Kim
How is the study designed?
Study Type
INTERVENTIONAL
Masking
DOUBLE
Allocation
RANDOMIZED
Model
PARALLEL
Primary Purpose
PREVENTION
Number of Arms
3
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