Force-endurance relationship: does it matter if gloves are donned?

Area of Science:

• Human factors engineering
• Space exploration ergonomics
• Biomechanics

Background:

• Human hand performance is significantly reduced when wearing gloves.
• Extra-vehicular activity (EVA) gloves in space pose unique challenges to hand function.
• Understanding exertion and endurance limits is crucial for astronaut safety and mission success.

Purpose of the Study:

• To establish exertion and endurance limits for specific tasks performed with EVA gloves.
• To develop predictive models for grip force endurance in space environments.
• To quantify the impact of glove design and pressure on hand performance.

Main Methods:

• A factorial experiment was conducted with six subjects.
• Variables included three hand conditions, three pressure differentials, and four levels of force exertion.
• Grip force and endurance time were measured under controlled conditions.

Main Results:

• Exerted force was influenced by glove type, pressure differential, and exertion level.
• Endurance time was primarily determined by the percentage of maximum possible exertion.
• A clear relationship between exertion level and endurance was established, independent of other factors.

Conclusions:

• Endurance time in EVA gloves is predictable based on relative exertion levels.
• Findings provide critical data for designing less fatiguing EVA gloves and optimizing astronaut task performance.
• The study offers valuable insights for both practical applications in space mission design and theoretical understanding of human-glove interaction.