Simulation of Consecutive Day Shift Work

NCT04625634 | Completed

• 1 other identifier: STUDY00003948
• Study Type: interventional
• Target: 23
• Locations: 1 country
• Sites: 1

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.

Conditions

Hyperthermia; Fatigue; Heat

Outcome Measures

Primary Outcomes (2)

• Core temperature

  Gastrointestinal temperature measured with an ingestable pill.

  20 minutes

• Heart rate

  Heart rate measured with a wearable heart rate strap and monitor

  20 minutes

Study Arms (1)

Consecutive work

EXPERIMENTAL

Subjects will complete 2 consecutive days of simulated firefighting tasks in the heat. The simulated work consists of 20 minutes of simulated structural work in a hot environment, followed by 20 minutes of seated rest in a temperate room, mimicking a typical recovery period in structural firefighting. Subjects then re-enter the environmental chamber and complete 23 minutes of simulated overhaul work in a temperate environment.

Other: 2 days of work heat stress

Interventions

2 days of work heat stress OTHER

2 consecutive days of identical simulated structural firefighting tasks.

Consecutive work

Eligibility Criteria

• Age: 18 Years - 39 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• y old men and women
• Self-reported to be healthy

You may not qualify if:

• 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

Sponsors & Collaborators

• State University of New York at Buffalo: lead

Study Sites (1)

Center for Research and Exercise in Special Environments

Buffalo, New York, 14214, United States

Location

MeSH Terms

Conditions

Hyperthermia; Heat Stress Disorders

Condition Hierarchy (Ancestors)

Body Temperature Changes; Signs and Symptoms; Pathological Conditions, Signs and Symptoms; Wounds and Injuries

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: OTHER
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Primary Investigator

Model Details: Repeated measures study

Study Record Dates

• First Submitted: November 6, 2020
• First Posted: November 12, 2020
• Study Start: December 2, 2019
• Primary Completion: May 1, 2022
• Study Completion: May 1, 2022
• Last Updated: July 26, 2022

Record last verified: 2022-07

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)