Affordable Access

Association of age with the threshold for detecting ankle inversion and eversion in upright stance.

Authors
  • Gilsing, M G
  • Van den Bosch, C G
  • Lee, S G
  • Ashton-Miller, J A
  • Alexander, N B
  • Schultz, A B
  • Ericson, W A
Type
Published Article
Journal
Age and ageing
Publication Date
Jan 01, 1995
Volume
24
Issue
1
Pages
58–66
Identifiers
PMID: 7762464
Source
Medline
License
Unknown

Abstract

A randomized quadruple staircase method and probit analysis were used to measure the thresholds for sensation of ankle inversion and eversion by 18 healthy young and 18 healthy old subjects while standing with a foot in a servo-driven cradle. The results of over 3600 trials show that the mean threshold for detecting inversion with a probability of 75% was 0.35 degrees in the older subjects, a value significantly greater than the 0.06 degrees threshold found in the younger group. The corresponding thresholds in eversion were significantly greater in both old (0.52 degrees) and young (0.35 degrees) subjects. Significant, but smaller, age differences were also found in unipedal stance. Few significant sex differences were found. When the velocity of a 0.1 degree inversion movement was increased from 2 to 200 degrees/s the probability of detecting it rose by only 22.6%. Although significantly increased with age, the threshold for sensing rotation in the weight-bearing ankle was measured in tenths of degrees, an order of magnitude better than previously reported (non-weight-bearing) values.

Report this publication

Statistics

Seen <100 times