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Viscoelastic response of the lateral side of the ankle to cyclic inversion: A time course analysis
Author(s) -
Malmir K.,
Olyaei G. R.,
Talebian S.,
Jamshidi A. A.
Publication year - 2014
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12211
Subject(s) - significant difference , viscoelasticity , coefficient of restitution , ankle , analysis of variance , mathematics , chemistry , medicine , physics , mechanics , surgery , thermodynamics , statistics
Although important, viscoelastic behavior of the ankle's lateral side has rarely been studied. The present study assesses the viscoelastic behavior during cyclic inversions. Eighteen recreationally active healthy males underwent 40 passive cyclic inversions using a B iodex dynamometer at 5 °/s through 80% of maximum range of motion. Energy absorption and restitution and dissipation coefficient were calculated for each repetition. Changes in the mean of the dependent variables for repetitions 1 ( R 1 ), R 5 , R 10 , R 15 , R 20 , R 25 , R 30 , R 35 and R 40 were compared by three one‐way analyses of variance with repeated measures. There was a significant difference between the means of energy absorption for the selected repetitions from R 1 to R 20 ( P < 0.01), but there was no significant difference between them from R 20 to R 40 ( P > 0.05). There was no significant difference between the means of energy restitution for the selected repetitions ( P > 0.05). Whereas there was no significant difference consecutively between the means of dissipative coefficient for the selected repetitions ( P > 0.05), there was a significant difference between the means of R 30 or R 40 relative to the baseline ( P < 0.005). The decrease in the energy absorbed and the dissipation coefficient following repeated inversions may be due to the slippage of collagen fibers. The decrease in the shock absorbing ability of the tissues may expose them to injury.