Simulation of Consecutive Day Shift Work

Not Applicable

Completed

• Conditions: Hyperthermia; Fatigue; Heat
• Interventions: Other: 2 days of work heat stress

• Registration Number: NCT04625634
• Lead Sponsor: State University of New York at Buffalo

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.

Detailed Description

Not available

Study Timeline

• Study Start: 2019-12-02
• Study First Submitted: 2020-11-06
• Study First Submitted QC: 2020-11-06
• Study First Posted: 2020-11-12
• Primary Completion: 2022-05-01
• Study Completion: 2022-05-01
• Status Verified: 2022-07
• Last Update Submitted: 2022-07-22
• Last Update Posted: 2022-07-26

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 23

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

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Consecutive work	2 days of work heat stress	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.

Primary Outcome Measures

Name	Time	Method
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

Trial Locations

Locations (1)

Center for Research and Exercise in Special Environments; 🇺🇸 Buffalo, New York, United States