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Locomotion in simulated zero gravity: ground reaction forces.

Jean L McCrory¹, Janice Derr, Peter R Cavanagh

¹Center for Locomotion Studies, Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA. mccroryjl@msx.upmc.edu

Aviation, Space, and Environmental Medicine

|March 17, 2004

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Simulated zero gravity (0 G) exercise can generate high foot loading rates, crucial for astronaut bone health. However, peak forces were lower than overground, suggesting gravity replacement system improvements are needed.

Area of Science:

Space physiology
Biomechanics
Exercise science

Background:

Bone demineralization is a significant risk for astronauts during long space missions.
Exercise is a key countermeasure, but foot loading during simulated reduced gravity is unknown.

Purpose of the Study:

To compare ground reaction forces (GRFs) during over-ground and simulated zero gravity (0 G) locomotion.
To determine if simulated 0 G exercise can replicate 1 G loading conditions.

Main Methods:

Measured GRFs during overground and simulated 0 G walking/running using a zero-gravity locomotion simulator (ZLS).
Assessed gravity replacement load (GRL) and joint angles (hip, knee) during simulated 0 G locomotion.

Main Results:

Keywords:

NASA Discipline Musculoskeletal Non-NASA Center

Related Experiment Videos

Peak forces were lower in the ZLS compared to overground locomotion.
Loading rates during ZLS running were higher than overground running.
Knee joint flexion increased during ZLS running support phase.

Conclusions:

Simulated 0 G exercise can produce substantial foot loads and loading rates.
Current ZLS peak forces are less than overground, indicating a need for system refinement.
Optimizing gravity replacement systems is essential for effective spaceflight exercise countermeasures.