CHARGE: Pilot Trial of Self-directed Use of Resources for Physical Activity

NCT07654868 | Not Yet Recruiting

• 1 other identifier: IRB202600162
• Study Type: interventional
• Target: 39
• Locations: 0 countries
• Sites: N/A

Brief Summary

This is a pilot RCT examining physical activity outcomes at 3 months across 3 conditions: use of large language model (LLM) fully self-directed; use of LLM with guidance; and use of online tools to help with sleep.

Conditions

Physical Activity

Keywords

exercise; large language model; generative AI; artificial intelligence; physical activity; chatbot

Outcome Measures

Primary Outcomes (1)

• Recruitment feasibility

  Ability to meet recruitment goal of 39 participants within an acceptable timeframe

  6 months

Secondary Outcomes (2)

• Retention

  3 month

• Physical activity

  3 months

Study Arms (3)

LLM alone

EXPERIMENTAL

Participants are recommended to use a publicly available, general-purpose LLM for physical activity promotion over the next 3 months

Behavioral: LLM alone

LLM enhanced

EXPERIMENTAL

Participants are recommended to use a publicly available, general-purpose LLM for physical activity promotion over the next 3 months and additionally attend an initial session providing guidance on LLM use and weekly text message with suggestions on using the LLM

Behavioral: LLM enhanced

Sleep promotion

ACTIVE COMPARATOR

Participants are recommended to use publicly available tools to help with sleep (websites with tips for sleep and guided meditation videos) over the next 3 months

Behavioral: Sleep promotion

Interventions

LLM alone BEHAVIORAL

Participants are recommended to use a publicly available, general-purpose LLM for physical activity promotion

LLM alone

LLM enhanced BEHAVIORAL

Participants are recommended to use a publicly available, general-purpose LLM for physical activity promotion over the next 3 months and additionally attend an initial session providing guidance on LLM use and weekly text message with suggestions on using the LLM

LLM enhanced

Sleep promotion BEHAVIORAL

Participants are recommended to use publicly available tools to help with sleep (websites with tips for sleep and guided meditation videos)

Sleep promotion

Eligibility Criteria

• Age: 18 Years - 75 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Age 18-75
• Reports a desire to increase physical activity level
• Not meeting minimum aerobic PA as indicated by L-CAT endorsement indicating level of activity below moderate (moderate defined as \>= 5x/week activity or higher)
• Reports willingness to use LLMs to help with exercise goals.
• Access to internet through phone data plan or home Wi-Fi.

You may not qualify if:

• Conditions warranting more extensive supervision of physical activity, including:
• Any history of MI or stroke, arrhythmias, or heart failure
• Uncontrolled hypertension
• Type 1 or 2 diabetes
• COPD or asthma
• Recent orthopedic surgery or fracture
• Advanced Parkinson's
• Pregnant or planning to become pregnant in next 9 months
• Active cancer undergoing treatment
• Recent major surgery (\<12 weeks)
• Use of assistive devices for ambulation
• History of eating disorder diagnosis
• Dementia diagnosis
• Unable to read on own.
• Hospitalization for mental health reasons in past year

Sponsors & Collaborators

• University of Florida: lead

MeSH Terms

Conditions

Motor Activity

Condition Hierarchy (Ancestors)

Behavior

Central Study Contacts

Megan A McVay, PhD

CONTACT

(352) 294-1638; megan.mcvay@ufl.edu

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: PREVENTION
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: June 12, 2026
• First Posted: June 17, 2026
• Study Start: June 22, 2026
• Primary Completion (Estimated): December 15, 2026
• Study Completion (Estimated): December 15, 2026
• Last Updated: June 17, 2026

Record last verified: 2026-06