Fatigue; Heat, Hyperthermia
Conditions
Brief summary
The purpose of this study is to determine differences in physiological recovery between two consecutive days of simulated fire suppression work. The secondary purpose is to determine differences in heat gain and heat loss between two consecutive days of simulated fire suppression work. Subjects will complete two consecutive days of simulated structural firefighting shift work, 24 hours apart. Before and after each laboratory visit, subjects will continuously wear a Holter monitor and ambulatory blood pressure monitor to quantify parasympathetic tone and recovery from work.
Interventions
OTHER2 days of work heat stress
2 consecutive days of identical simulated structural firefighting tasks.
Sponsors
State University of New York at Buffalo
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
OTHER
Masking
NONE
Intervention model description
Repeated measures study
Eligibility
Sex/Gender
ALL
Age
18 Years to 39 Years
Healthy volunteers
Yes
Inclusion criteria
* 18-39 y old men and women * Self-reported to be healthy
Exclusion criteria
* History of any cardiovascular, neurologic, renal, or metabolic disease * Current tobacco use or regular use within the last 2 years * Taking medications with known thermoregulatory or cardiovascular effects (e.g., aspirin, acetaminophen, ibuprofen, beta blockers, diuretics, psychotropics, etc.) * History of exertional heat stroke * Currently pregnant or breastfeeding, or planning to become pregnant during the study * Inability to follow the rules of the protocols or understand the consent form * No contraindications for ingestion of the gastrointestinal temperature pill
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Core temperature | 20 minutes | Gastrointestinal temperature measured with an ingestable pill. |
| Heart rate | 20 minutes | Heart rate measured with a wearable heart rate strap and monitor |
Countries
United States
Outcome results
None listed