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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Caffeine effects on physical and cognitive performance during sustained operations.

Tom M McLellan¹, Gary H Kamimori, David M Voss

¹Individual Readiness Section, DRDC-Toronto, 1133 Sheppard Avenue West, PO Box 2000, Toronto, Ontario M3M 3B9, Canada. tom.mclellan@drdc-rddc.gc.ca

Aviation, Space, and Environmental Medicine

|September 26, 2007

Summary

Caffeine (CAF) supplementation maintained vigilance and physical performance in soldiers during demanding sustained operations. This included overnight wakefulness and limited sleep, showing CAF

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Published on: December 29, 2016

Area of Science:

Exercise Physiology
Human Performance
Military Science

Background:

Sustained military operations often involve sleep deprivation and continuous duty.
Maintaining cognitive and physical function under these conditions is critical for mission success.
Caffeine is a widely used stimulant with potential ergogenic and vigilance-enhancing properties.

Purpose of the Study:

To investigate the effects of caffeine (CAF) on physical performance and vigilance.
To assess CAF's impact during 4 days and 3 nights of sustained operations in Special Forces personnel.
To determine if CAF can mitigate performance decrements associated with sleep restriction and overnight work.

Main Methods:

Twenty soldiers were divided into placebo (PLAC) and caffeine (CAF) groups.
Participants completed a 4-km obstacle run daily and underwent vigilance testing during overnight shifts.
Caffeine (200 mg) or placebo was administered multiple times daily, including before the run and during vigilance sessions.

Main Results:

Vigilance performance was significantly greater in the CAF group compared to the PLAC group.
Caffeine-treated soldiers exhibited faster total run times on Day 3, primarily due to quicker obstacle completion.
While run times improved for both groups on subsequent days, caffeine appeared to support sustained performance.

Conclusions:

Caffeine effectively maintained both vigilance and physical performance during sustained operations.
The findings suggest caffeine is beneficial in scenarios requiring overnight wakefulness and restricted sleep.
Caffeine supplementation can be a viable strategy to support soldier readiness in demanding operational environments.