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Control of isometric force in hypergravity

O Bock¹, B S Cheung

¹German Sports University, Köln, Germany.

Aviation, Space, and Environmental Medicine

|February 6, 1998

Summary

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In hypergravity, individuals produced significantly more force than intended, indicating a constant underestimation of their own muscular output. This affects finely graded force production.

Area of Science:

Human physiology
Gravitational biology
Motor control

Background:

Proprioceptive signals are thought to be impaired in hypergravity environments.
This impairment may disrupt the precise control of muscle force production.

Purpose of the Study:

To investigate the effects of hypergravity on isometric force production.
To determine if finely graded force control is altered under increased gravitational loads.

Main Methods:

Subjects exerted isometric force using their thumb and index finger under verbal command.
Force production was measured before, during, and after exposure to +1.5 Gz and +3 Gz.
The produced force was oriented perpendicular to the direction of gravity.

Main Results:

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In hypergravity, subjects produced forces approximately 400 pond higher than in normal gravity for a given target.
The ability to modulate produced force in relation to target force remained unchanged.
Similar quantitative results were observed at +1.5 Gz and +3 Gz, with a notable positive aftereffect.

Conclusions:

Individuals consistently underestimate the force they generate in hypergravity conditions.
These findings align with previous observations of altered pointing and grasping movements in hypergravity.