Effects of joint immobilization on standing balance

We investigated the effect of joint immobilization on the postural sway during quiet standing. We hypothesized that the center of pressure (COP), rambling, and trembling trajectories would be affected by joint immobilization. Ten young adults stood on a force plate during 60 s without and with immob...

Full description

Saved in:
Bibliographic Details
Published in:Human movement science 2009-08, Vol.28 (4), p.515-528
Main Authors: Freitas, Paulo B. de, Freitas, Sandra M.S.F., Duarte, Marcos, Latash, Mark L., Zatsiorsky, Vladimir M.
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Computer Graphics
Female
Fundamental and applied biological sciences. Psychology
Hip Joint - physiology
Humans
Immobilization - methods
Joint constraint
Joints - physiology
Knee Joint - physiology
Male
Postural Balance - physiology
Postural control
Posture
Quiet stance
Sensory Deprivation - physiology
Signal Processing, Computer-Assisted
Single inverted pendulum
Software
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
Vision, Ocular - physiology
Weight-Bearing - physiology
Young Adult
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We investigated the effect of joint immobilization on the postural sway during quiet standing. We hypothesized that the center of pressure (COP), rambling, and trembling trajectories would be affected by joint immobilization. Ten young adults stood on a force plate during 60 s without and with immobilized joints (only knees constrained, CK; knees and hips, CH; and knees, hips, and trunk, CT), with their eyes open (OE) or closed (CE). The root mean square deviation (RMS, the standard deviation from the mean) and mean speed of COP, rambling, and trembling trajectories in the anterior–posterior and medial–lateral directions were analyzed. Similar effects of vision were observed for both directions: larger amplitudes for all variables were observed in the CE condition. In the anterior–posterior direction, postural sway increased only when the knees, hips, and trunk were immobilized. For the medial–lateral direction, the RMS and the mean speed of the COP, rambling, and trembling displacements decreased after immobilization of knees and hips and knees, hips, and trunk. These findings indicate that the single inverted pendulum model is unable to completely explain the processes involved in the control of the quiet upright stance in the anterior–posterior and medial–lateral directions.
ISSN:0167-9457
1872-7646
DOI:10.1016/j.humov.2009.02.001