Impact of Extreme Heat on Myocardial Blood Flow and Flow Reserve in Young and Older Adults

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Total Enrollment

24 participants

Study Classification

OBSERVATIONAL

Study Start Date

2025-02-03

Study Completion Date

2027-02-01

Brief Summary

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Extreme heat causes a disproportionate number of hospitalizations and deaths in older adults relative to any other age group. Importantly, many hospitalizations and deaths are primarily due to cardiovascular events such as myocardial infarction. Previous data indicate that older adults have attenuated skin blood flow and sweating responses when exposed to heat, resulting greater increase in core body temperature. Despite these observations, relatively little is known about the risk for myocardial ischemia potentially contributing to the aforementioned higher morbidity and mortality in older adults during heat waves. The broad objective of this work is to determine the impact of ambient heat exposure on myocardial blood flow and flow reserve in young and older adults. Aim 1 will test the hypothesis that older adults exhibit attenuated myocardial flow reserve compared to young adults during heat stress. Aim 2 will determine if the percent of maximal myocardial flow reserve (assess via vasodilator stress) during heat exposure is higher in older adults compared to young adults. The expected outcome from this body of work will improve our understanding of the consequences of aging on cardiovascular responses to ambient heat stress.

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Detailed Description

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Conditions

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Aging Heat Stress Hyperthermia Heat Strain

Study Design

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Observational Model Type

COHORT

Study Time Perspective

PROSPECTIVE

Study Groups

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Young participants

Individuals aged 18-39 years

Ambient heat stress

Intervention Type OTHER

3-hour ambient heating in 44°C and 20% relative humidity

Older participants

Individuals aged 65 years or older

Ambient heat stress

Intervention Type OTHER

3-hour ambient heating in 44°C and 20% relative humidity

Interventions

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Ambient heat stress

3-hour ambient heating in 44°C and 20% relative humidity

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Healthy male and female individuals
* 18-35 years or 65+ years of age
* Free of any underlying moderate to serious medical conditions

Exclusion Criteria

* Known heart disease; other chronic medical conditions requiring regular medical therapy including cancer, diabetes, neurological diseases, uncontrolled hypertension, and uncontrolled hypercholesterolemia.
* Taking of any medications (such as beta blockers and non-dihydropyridine calcium channel blockers) that have known influences on either cardiac function or sweating responses.
* Abnormalities detected on routine screening.
* Current smokers, as well as individuals who regularly smoked within the past 3 years.
* Body mass index of greater than 30 kg/m\^2
* Pregnant individuals

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes