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Completed

NCT Number: NCT06901037

A Pilot Randomized Controlled Trial of Chatbot Use in Older Adults for Lifestyle Change

The purpose of this study is to evaluate the acceptability and preliminary effectiveness of a smartphone-delivered AI-based chatbot in promoting healthy dietary behavior and physical activity participation among older adults.

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Key information

Conditions

Healthy Lifestyle

Age range

65 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

The Hong Kong Polytechnic University

Hong Kong

About this study

The purpose of this study is to evaluate the preliminary effectiveness of a smartphone-delivered AI-based chatbot in promoting healthy dietary behavior and physical activity participation among older adults. It is a preliminary study with two arms.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • aged 65 or above.
  • are community-dwelling.
  • are proficient in Mandarin.
  • have an Internet connection.
  • have at least one instant messaging app on the smartphone or agree to download one.

Exclusion criteria

  • have any neurocognitive disorders.
  • are unable to engage in moderate-intensity level of physical activity due to a preexisting medical condition.
  • live with another participant who will participate in this study.

Treatment and study plan

A chatbot-based intervention

Other

A smartphone-delivered AI-based chatbot program designed to provide personalized physical activity and dietary recommendations

Primary outcomes

  1. The acceptance of the chatbot among older adults, as measured by a 14-item simplified version of the Senior Technology Acceptance Model questionnaire

    Time frame: End of study (2 months)

    The 14-item questionnaire uses a 10-point Likert scale, ranging from 0 (strongly disagree, very poor, very uneasy, and very unsatisfied) to 10 (strongly agree, very good, very easy, and very satisfied)

  2. The Usability of the chatbot, as measured by the System Usability Scale

    Time frame: End of study (2 months)

    The System Usability Scale (SUS) is a 10-item Likert scale questionnaire. The result of this survey is called SUS score, which ranges from 0 to 100 and provides information about overall customer satisfaction and usability. A higher score indicates better usability, while a lower score may suggest usability issues.

  3. The user experience, as measured by 10 open-ended questions

    Time frame: End of study (2 months)

    A qualitative interview will be provided to the participants for asking their experience in using chatbot.

Secondary outcomes

  1. Change of dietary behavior, as measured by the intake of fruits and vegetables over the last seven days

    Time frame: Baseline, end of study (2 months)

    We will ask them the amount of fruit and vegetable intake at baseline and end of study.

  2. Change of walking, as measured by the Community Health Activities Model Program for Seniors questionnaire

    Time frame: Baseline, end of study (2 months)

    The Community Health Activities Model Program for Seniors questionnaires (CHAMPS-Q) measures weekly frequency and duration of walking

  3. Change of total activity and moderate and more vigorous physical activity variables, as measured by the CHAMPS-Q

    Time frame: Baseline, end of study (2 months)

    The CHAMPS-Q measures weekly frequency and duration of a variety of lifestyle physical activities

  4. Change of quality of life, as measured by the Hong Kong Quality of Life for Older Persons Scale

    Time frame: Baseline, end of study (2 months)

    The Hong Kong Quality of Life for Older Persons Scale (HKQoLOCP) comprises a total of 21 items that can be categorized into different domains: subjective well-being, consisting of 4 items; health, comprising 5 items; interpersonal relationships, including 6 items; achievement-recognition, with 4 items; and finance and living conditions (1 item each)

Interested in participating?

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Sponsors and collaborators

Lead sponsor

The Hong Kong Polytechnic University

Other

Registry information

Official study title

The Acceptability and Preliminary Effectiveness of Using A Smartphone-delivered AI-Based Chatbot in Older Adults for Lifestyle Modification: A Pilot Randomized Controlled Trial

Important dates

Study start
2025
Primary completion
2026
Study completion
2026
First posted
Mar 28, 2025
Registry last updated
Sep 16, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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