Article

There is preliminary evidence that BMI is positively correlated with movement
variability of standing posture. However, this negative effect of obesity on
postural control may be mediated by the change in other body scale variables
(e.g., mechanical and fitness) that also occur with changes in BMI. This study
investigated the influence of selected body scale (height, body mass, BMI), body
composition (body fat percentage), mechanical (moment of inertia - MI) and
strength (S) variables as predictors of the control of postural motion in
adolescents. 125 healthy adolescents (65 boys, 60 girls) with a wide range of BMI
(13.8-31.0 kg/m(2)) performed a battery of tests that assessed body composition,
anthropometry, muscular strength and postural control. Multiple measures of
postural motion variability were derived for analysis with body scale, mechanical
and lower extremity strength variables separately for boys and girls. BMI, height
and body mass, considered both separately and collectively, were poor and/or
inconsistent predictors of variability in all three posture tasks. However, the
ratio of lower extremity strength to whole body moment of inertia showed the
highest positive correlation to most postural variability measures in both boys
and girls and these effects were strongest in the less stable tasks of single leg
standing and recovery of stance. Our findings support the hypothesis that
diminished lower extremity strength to mechanical constraint ratio compromises
the robustness of the strength to body scale relation in movement and postural
control.
CI - Copyright (c) 2011 Elsevier B.V. All rights reserved.

Langue : ANGLAIS