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    Area of Science:

    • Biomechanical Engineering
    • Human Factors and Ergonomics
    • Space Systems Engineering

    Background:

    • Human spacesuit fit is poorly understood, impacting operational performance and injury risk.
    • Current spacesuit fit assessments rely on subjective feedback.
    • Developing objective metrics for spacesuit fit is crucial for improving astronaut safety and efficiency.

    Purpose of the Study:

    • To develop and evaluate novel metrics for quantifying human spacesuit fit.
    • To assess the sensitivity of these metrics to changes in padding thickness.
    • To understand the relationship between spacesuit fit, gait performance, and injury risk.

    Main Methods:

    • Three subjects wore the Mark III spacesuit with varying padding thicknesses.
    • Inertial measurement units tracked human and suit kinematics during walking.
    • Metrics computed included cadence, range of motion, and a dynamic fit coordination metric (ρ).

    Main Results:

    • The Mark III spacesuit reduced cadence by 20.4% and range of motion by 16.5%.
    • Padding thickness significantly altered the difference in human-suit range of motion (ΔtRoM), with inter-subject variability.
    • Dynamic fit (ρ) showed distinct patterns related to heel strike and toe-off phases of gait.

    Conclusions:

    • Padding had mixed effects on gait performance and dynamic fit.
    • Inter-subject differences in dynamic fit suggest suit component sizing is critical.
    • Quantitative metrics align with subjective feedback, demonstrating their utility for spacesuit fit evaluation.