Implementing an Intervention to Reduce Heat Stress and Chemical Exposures

Dehydration Clinical Trial

Official title:

Implementing an Intervention to Reduce Heat Stress and Chemical Exposures

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT06442969
• Other study ID #: HS-2024-0081
• Status: Recruiting
• Phase: N/A
• Start date: June 2024
• Est. completion date: August 2025

Study information

• Verified date: June 2024
• Source: San Diego State University
• Contact: Nicolas I Lopez-Galvez, PhD
• Phone: 858-292-1416
• Email: nilopez[@]sdsu.edu
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The investigators are studying the dangers that farmworkers face while working in the fields and at home. The investigators goals are:

1. Measure how much heat and chemicals farmworkers in Imperial County are exposed to.

The investigators will ask the participants to wear a special belt under their clothes during work to measure heat. The investigators will also put two small temperature monitors in the participant's home for a day. The investigators will collect a urine sample to check hydration, and also measure the participants height, weight, blood pressure, and some blood markers for diseases using a simple finger-prick test.

To measure chemicals, the investigators will give the participants a wristband to wear for a week and hang another in the participants home. The investigators will also collect dust from each participant's home with a vacuum. Then, the investigators will analyze everything at San Diego State University.

After collecting samples, a trained community health worker will ask the participants a few questions about their work, lifestyle, health symptoms, and any hazards they face. The investigators will meet the participants twice at their homes to distribute the tools which will later be collected. Once the tools are collected, the investigators will have the chance to follow up with the participants if they have any questions.

2. Provide help to lower heat and chemical exposure with the help of community health workers.

3. Measure heat and chemicals again using the same methods to see if the project made a difference.

4. Talk to participants about what they liked and how the investigators can make future projects better.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 60
• Est. completion date: August 2025
• Est. primary completion date: October 2024
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Currently living in Imperial County, California, USA

• Currently work in agriculture

• Plan on living in Imperial Valley for the next 6 months

Exclusion Criteria:

• Not currently living in Imperial County, California, USA

• Not currently working in agriculture

• Not planning to live in Imperial Valley for the next 6 months

Related Conditions & MeSH terms

• Dehydration
• Heat Stress
• Heat Stress Disorders

Intervention

Other:
• Education and resources provided by community health workers
The intervention will consist of implementing existing tools provided by EPA's Design for the Environment program, CalOSHA and NIOSH sector-specific guidance for agricultural workers, the Imperial County Department of Public Health and materials from California Department of Toxics Substances Control. The investigators will utilize and adjust existing educational tools such as the Heat Illness Prevention plan developed by CalOSHA. In addition to the educational materials, the investigators will give each farmworker cooling working gear to be worn during their work-shift with (specialized clothes that has been used in other occupational settings). The investigators will provide all participants with a low-cost fan filter, known as Corsi-Rosenthal box built jointly by the community health/research team to reduce chemicals at home, and a small A/C unit to reduce heat stress.

Locations

Country	Name	City	State
United States	Lideres Campesinas Imperial	El Centro	California

Sponsors (1)

Lead Sponsor	Collaborator
San Diego State University

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Individual heat stress	Skin temperature in degrees Celsius derived from skin temperature monitor worn against the participant's skin.	Assessment at baseline (pre-intervention) and again immediately (week) after the intervention
Primary	Participant household temperature	Household temperature in degrees Celsius, derived from weather monitor placed in the participant's home.	Assessment at baseline (pre-intervention) and again immediately (week) after the intervention
Primary	Participant hydration level	Specific gravity of participant's urine	Assessment at baseline (pre-intervention) and again immediately (week) after the intervention
Primary	Concentration of chemicals measured in silicon wristband worn by study participant	Participants will be asked to wear a silicon wristbands twice; once at baseline and again after the intervention. The research team will collect the wristbands and transport them to San Diego State University for analysis of different classes of chemicals, including pesticides, organophosphates, pyrethroids, and legacy pollutants. The chemicals adhered to the wristbands will be extracted in ethyl acetate and then passed through a solid-phase extraction. Extracts will be analyzed using a two-dimensional gas chromatography coupled to time-of-flight mass spectrometry at San Diego State University. The final concentration of each chemical will be expressed as nanograms per gram of wristband.	Assessment at baseline (pre-intervention) and again immediately (week) after the intervention
Primary	Concentration of chemicals measured in silicon wristbands hung in the participant's household.	Silicon wristbands will be hung in participants' homes twice; once at baseline and again after the intervention. The research team will collect the wristbands and transport them to San Diego State University for analysis of different classes of chemicals, including pesticides, organophosphates, pyrethroids, and legacy pollutants. The chemicals adhered to the wristbands will be extracted in ethyl acetate and then passed through a solid-phase extraction. Extracts will be analyzed using a two-dimensional gas chromatography coupled to time-of-flight mass spectrometry at San Diego State University. The final concentration of each chemical will be expressed as nanograms per gram of wristband.	Assessment at baseline (pre-intervention) and again immediately (week) after the intervention
Primary	Concentration of chemicals measured in participant's household dust collected with a vacuum	The research team will visit the participant's home twice to collect the dust samples of the living area using a vacuum; once at baseline and again after the intervention. After collection, the research team will transport the dust samples to San Diego State University to measure the concentrations of different classes of chemicals, including pesticides, organophosphates, pyrethroids, and legacy pollutants. The chemicals in the dust will be extracted in ethyl acetate and then passed through a solid-phase extraction. Extracts will be analyzed using a two-dimensional gas chromatography coupled to time-of-flight mass spectrometry at San Diego State University. The final concentration of each chemical will be expressed as nanograms per gram of dust.	Assessment at baseline (pre-intervention) and again immediately (week) after the intervention