Manual performance in the cold with gloves and bare hands.

Area of Science:

• Human factors
• Environmental physiology
• Occupational safety

Background:

• Manual task performance in cold environments is poorly understood.
• Task-specific decrements and reduction strategies are not well-defined.
• Previous research lacks detailed analysis of cold-induced impairments on specific abilities.

Purpose of the Study:

• To investigate the relationship between task characteristics and cold-induced performance decrements.
• To determine how cold temperatures and glove use affect manual task abilities.
• To identify task-specific vulnerabilities to cold and protective gear.

Main Methods:

• 24 U.S. Marines performed a battery of nine standardized manual tasks.
• Tasks were performed across a range of cold temperatures, with and without gloves.
• Performance was measured to quantify decrements in specific abilities.

Main Results:

• Cold temperatures affected three specific manual abilities, with decrements increasing as temperature dropped.
• Glove use impaired three tasks, including two also affected by cold.
• Cold and glove effects on performance were independent.

Conclusions:

• Cold impairs specific manual abilities, with performance degradation worsening at lower temperatures.
• Glove use introduces separate performance decrements.
• Bare-handed testing is impractical below -18°C for extended periods.