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Diver performance: the effect of cold.

F M Davis¹, A D Baddeley, T R Hancock

¹Magill Department of Anaesthetics, Westminster Hospital, London, England.

Undersea Biomedical Research

|September 1, 1975

Summary

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Cold water immersion significantly impairs divers' cognitive and manual performance, with word recall most affected. Performance decline is rapid, though word recognition links to rectal temperature drops in colder dives.

Area of Science:

Human physiology
Environmental physiology
Diving science

Background:

Cold water exposure poses risks to divers.
Understanding performance decrements in cold water is crucial for safety.

Purpose of the Study:

To quantify cognitive and manual performance changes in divers exposed to cold water.
To investigate the relationship between body temperature and performance impairment.

Main Methods:

Fifteen divers undertook standardized tasks in 20°C and 5°C water using scuba gear.
Rectal and skin temperatures were monitored throughout dives.
Heat loss was calculated based on temperature changes.

Main Results:

Significant performance declines were observed in arithmetic, logical reasoning, word recall, word recognition, and manual dexterity in colder water.

Related Experiment Videos

Average rectal temperature dropped by 0.5°C (20°C) and 1.1°C (5°C).

Word recognition impairment correlated with rectal temperature drop in 5°C dives, while other decrements were immediate.

Conclusions:

Cold water immersion causes rapid, significant performance deterioration in divers.
While some cognitive tasks show temperature correlation, immediate effects dominate.
Findings inform understanding of cold's impact on underwater performance and safety protocols.