Reduced gravity effects on gait coordinative structures.

Area of Science:

• Biomechanics
• Space Exploration
• Human Physiology

Background:

• Limited understanding of human locomotion in reduced gravity due to minimal lunar surface activity.
• Upcoming NASA Artemis missions necessitate knowledge of gait adaptations for long-term extraterrestrial habitation.

Purpose of the Study:

• To investigate and quantify gait pattern changes under simulated Lunar (0.17 g) and Martian (0.38 g) gravity compared to Earth (1.0 g).
• To analyze the coordinative structures of human ambulation in fractional gravity environments.

Main Methods:

• Utilized the Active Response Gravity Offload System (ARGOS) to simulate Martian and Lunar gravity conditions.
• Employed Vicon motion capture technology and principal component analysis to quantify gait parameters during walking and running on a treadmill.

Main Results:

• Significant differences in coordinative gait structures were observed across all fractional gravity conditions (p < 0.05).
• Increased gait asymmetry was noted under simulated Lunar gravity.
• A distinct skipping gait pattern emerged during running in both Lunar and Martian simulated gravity.

Conclusions:

• Fractional gravity significantly alters human gait coordination and dynamics.
• Understanding these altered gait patterns is essential for astronaut safety and mission success during long-duration stays on the Moon and Mars.
• The identification of a skipping gait highlights novel locomotor strategies in reduced gravity environments.