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Publication AbstractsControl of isometric force in hypergravityBock O, Cheung BSKAviat Space Environ Med 1998; 69:27-31 AbstractBackground: Previous work suggests that proprioceptive signals are degraded in hypergravity (hyper-G). We, therefore, expected that production of finely graded force is disturbed as well. Method: Subjects produced isometric force with their thumb and index finger upon verbal instruction, before, during, and after exposure to +1 Gz and +3 Gz. Produced force was orthogonal to the direction of gravity. Results: In hyper-G, responses to a given target value were significantly higher (by about 400 pond) than in normal gravity, while the modulation of produced force with target force didn't change. The results in +1.5 Gz and +3 Gz were quantitatively similar, and a positive aftereffect was found. Conclusions: Subjects underestimate by a constant amount the force they produce in hyper- G. Our results are reminiscent of similar findings with pointing and grasping movements in hyper-G.
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