[Some problems in quantification of postural instability with gravinography].
D000328:Adult; D000368:Aged; D002524:Cerebellar Ataxia / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D004856:Postural Balance; D011187:Posture