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Oxygen cost during exercise in simulated subgravity environments.

E L Fox, R L Bartels, E C Chaloupka

Aviation, Space, and Environmental Medicine

|March 1, 1975

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Reduced gravity significantly lowers oxygen cost (VO2) and heart rate (HR) during walking. However, mechanical efficiency remains constant, suggesting less body weight carried is the primary factor.

Area of Science:

Exercise Physiology
Human Physiology
Space Medicine

Background:

Understanding the physiological effects of reduced gravity is crucial for space exploration.
Previous research indicates altered metabolic and cardiovascular responses in microgravity.

Purpose of the Study:

To investigate the oxygen cost (VO2) and heart rate (HR) during treadmill walking in simulated subgravity.
To determine the impact of simulated reduced gravity on human mechanical efficiency during locomotion.

Main Methods:

Subjects walked on a treadmill in simulated environments of 0.25, 0.5, and 1 G using a slow rotation room and centrifugation.
Oxygen consumption (VO2) and heart rate (HR) were measured at various speeds (3.2, 4.7, 6.1 km/h).
Inclined plane technique was used to simulate 0.5 G conditions.

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Main Results:

VO2 and HR were significantly reduced in all simulated subgravity conditions compared to 1 G.
Mechanical efficiency, calculated as net VO2 per unit weight carried, was independent of gravity.
Reduced oxygen cost in subgravity is primarily attributed to the decreased body weight being supported.

Conclusions:

Locomotion in reduced gravity environments leads to lower metabolic and cardiovascular demands.
Human mechanical efficiency during walking is maintained across different gravity levels.
The primary driver for decreased oxygen consumption in reduced gravity is the reduction in the effective body weight carried.