Tandem Walk in Simulated Martian Gravity and Visual Environment.

Area of Science:

• Space Medicine
• Human Physiology
• Vestibular System

Background:

• Spaceflight causes visual-vestibular conflicts, leading to space motion sickness and impaired functional tasks upon return.
• Understanding these deficits is crucial for astronaut health and mission success, especially for Mars missions.

Purpose of the Study:

• To simulate and evaluate post-flight dynamic balance deficits in astronauts using a partial gravity analog.
• To investigate the effects of simulated Martian gravity (0.38 G) on tandem walking performance under visual-vestibular conflict conditions.

Main Methods:

• Participants underwent tandem walking on foam surfaces under simulated 0 G, 0.38 G, and 1 G conditions.
• Virtual reality was used to present normal vision and disorienting optokinetic stimulation (DOS) to induce visual-vestibular conflict.
• Walking performance was assessed by measuring stability and ability to maintain balance.

Main Results:

• Tandem walking performance with DOS was significantly better in 0.38 G compared to 1 G.
• Performance in 1 G with DOS was comparable to post-spaceflight or bed rest conditions.
• Improved performance in 0.38 G was attributed to an increased cone of stability, allowing greater body sway tolerance.

Conclusions:

• Tandem walking on compliant foam with visual-vestibular conflict serves as a viable analog for simulating astronaut post-flight balance deficits.
• Simulated Martian gravity (0.38 G) may offer a more effective environment for studying and potentially mitigating these balance impairments.