Community Health Adaptation & Resilience Mobilization (CHARM) HeatWise (CHARM)

April 14, 2026 updated by: Public Health Institute, California

Community Health Adaptation & Resilience Mobilization (CHARM) Lake County

Extreme heat events pose serious health risks, especially for communities with limited access to cooling, transportation, or social support. This study pilots and tests HEATwise, a heat preparedness program delivered at trusted community centers in Lake County, California, serving older adults, Tribal members, and people experiencing housing or economic hardship. HEATwise is a 12-week program which includes a group workshop on heat risks and preparedness, one-on-one resource navigation, a community celebration event, and a cooling and emergency supply kit. The pilot phase (2026) will assess feasibility and acceptability at three sites with approximately 60 participants. The full trial (2027-2028) will randomly assign eight sites to receive HEATwise immediately or after a delay, measuring whether the program increases protective behaviors, reduces heat-related symptoms, and strengthens resilience over 12 months.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

580

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • United States
    • California
      • Lakeport, California, United States, 95453
        • Recruiting
        • Big Valley Rancheria
        • Contact:
        • Principal Investigator:
          • Sarah Ryan

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Eligible participants are adults (≥18 years) who have resided in Lake County for at least 6 months, are able to access a phone for study communications, and are willing to provide a valid secondary contact for the duration of the study.

Exclusion Criteria:

  • Participants must also be a recognized member or affiliate of a articipating site, referred by the site, or reside within 5 miles of the site. Individuals are excluded if another household member is already enrolled in the study, if they cannot provide a secondary or emergency contact, are unable to independently complete study activities, or plan to be away for 15 or more consecutive days during the intervention period.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Immediate HEATWise
Intervention shortly after enrollment
Behavioral: CHARM HeatWise
HEATWise consists of structured, facilitator-led training sessions on extreme heat preparedness and response, distribution of heat resilience kits, and community engagement activities designed to promote protective behaviors. The intervention is delivered at the cluster (site) level in community-based settings and focuses on reducing risk of heat-related illness and improving individual and community resilience.
Other: Delayed HEATWise)
Treatment as usual. These sites will offer the HEATwise program the following year, after the intervention is complete, and all waitlist control participants will be invited to participate.
Behavioral: CHARM HeatWise
HEATWise consists of structured, facilitator-led training sessions on extreme heat preparedness and response, distribution of heat resilience kits, and community engagement activities designed to promote protective behaviors. The intervention is delivered at the cluster (site) level in community-based settings and focuses on reducing risk of heat-related illness and improving individual and community resilience.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in Symptoms
Time Frame: 3-months post-intervention
Change in self-reported heat-illness symptoms: "Self-reported heat stress measure". Range 0-8, with higher scores indicating higher heat stress
3-months post-intervention

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in individual and community resilience scores: "Communities Advancing Resilience Toolkit"
Time Frame: Baseline to 15-months post-enrollment (12-month follow-up period)
35 items community resilience measure, outcome is mean score from 1-5 (strongly disagree-strongly agree); 19 items individual resilience measure - outcome is mean score from 1-5 (strongly disagree-strongly agree)
Baseline to 15-months post-enrollment (12-month follow-up period)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Public Health Institute, California

Collaborators

National Heart, Lung, and Blood Institute (NHLBI)

Investigators

  • Principal Investigator: Michelle Wong, Public Health Institute
  • Principal Investigator: Susan Paulukonis, Public Health Institute
  • Principal Investigator: Sarah Ryan, Big Valley Band of Pomo Indians

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

April 15, 2026

Primary Completion (Estimated)

June 2, 2028

Study Completion (Estimated)

June 2, 2028

Study Registration Dates

First Submitted

March 23, 2026

First Submitted That Met QC Criteria

March 23, 2026

First Posted (Actual)

March 30, 2026

Study Record Updates

Last Update Posted (Actual)

April 17, 2026

Last Update Submitted That Met QC Criteria

April 14, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • IRB #I25-022
  • OT2HL158287 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

De-identified individual participant data underlying the primary and secondary outcomes, along with codebooks and metadata, will be shared via ICPSR following publication of the primary results or study completion, in accordance with the approved Data Management and Sharing Plan.

IPD Sharing Time Frame

Following publication of the primary results or upon study completion, consistent with the approved Data Management and Sharing Plan.

IPD Sharing Access Criteria

Data will be available to qualified researchers through ICPSR under applicable data use agreements.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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