scholarly journals Characterizing Local Dynamic Stability of Lumbar Spine Sub-regions During Repetitive Trunk Flexion-Extension Movements

2019 ◽  
Vol 1 ◽  
Author(s):  
Dennis J. Larson ◽  
Yunxi Wang ◽  
Derek P. Zwambag ◽  
Stephen H. M. Brown
Keyword(s):  
Lumbar Spine ◽  
Dynamic Stability ◽  
Local Dynamic ◽  
Trunk Flexion ◽  
Local Dynamic Stability ◽  
Flexion Extension

Influences of Speed and Treadmill Inclination on the Local Dynamic Stability of Human Knee Joint

2018 ◽  
Vol 880 ◽  
pp. 130-135 ◽  
Author(s):  
Marius Georgescu ◽  
Alin Petcu ◽  
Daniela Tarniţă
Keyword(s):  
Dynamic Stability ◽  
Knee Joints ◽  
Single Subject ◽  
Local Dynamic ◽  
Human Knee ◽  
Finite Time Lyapunov Exponents ◽  
Local Dynamic Stability ◽  
Human Knee Joint ◽  
Flexion Extension ◽  
Experimental Time Series

In this paper finite-time Lyapunov exponents (LE) were estimated to quantify the local dynamic stability from the experimental time series of the flexion-extension angle of single subject knee joints, walking over-ground and on plane and inclined treadmill with different speeds and inclinations.

Local Dynamic Joint Stability During Human Treadmill Walking in Response to Lower Limb Segmental Loading Perturbations

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Shawn M. Beaudette ◽  
Timothy A. Worden ◽  
Megan Kamphuis ◽  
Lori Ann Vallis ◽  
Stephen H. M. Brown
Keyword(s):  
Lumbar Spine ◽  
Dynamic Stability ◽  
Lower Limb ◽  
Loading Condition ◽  
Treadmill Walking ◽  
Local Dynamic ◽  
Joint Stability ◽  
Limb Segment ◽  
Local Dynamic Stability

Our purpose was to quantify changes in local dynamic stability (LDS) of the lumbar spine, hip, knee, and ankle in response to changes in lower limb segment mass, as well as to quantify temporal adaptations to segment loading during treadmill walking. Results demonstrate that increased mass distal to a joint yields either the maintenance of, or increased stabilization of, that particular joint relative to the unloaded condition. Increased mass proximal to a particular joint resulted in joint destabilization. The hip and ankle LDS were observed to change temporally, independent of segment loading condition, suggesting adaptation to walking on a treadmill interface.

To What Extent Does Not Wearing Shoes Affect the Local Dynamic Stability of Walking?: Effect Size and Intrasession Repeatability

2014 ◽  
Vol 30 (2) ◽  
pp. 305-309 ◽  
Author(s):  
Philippe Terrier ◽  
Fabienne Reynard
Keyword(s):  
Dynamic Stability ◽  
Effect Size ◽  
Intraclass Correlation ◽  
Clinical Findings ◽  
Local Dynamic ◽  
Gait Stability ◽  
Local Dynamic Stability ◽  
Gait Parameters ◽  
Absolute Agreement ◽  
The Stability

Local dynamic stability (stability) quantifies how a system responds to small perturbations. Several experimental and clinical findings have highlighted the association between gait stability and fall risk. Walking without shoes is known to slightly modify gait parameters. Barefoot walking may cause unusual sensory feedback to individuals accustomed to shod walking, and this may affect stability. The objective was therefore to compare the stability of shod and barefoot walking in healthy individuals and to analyze the intrasession repeatability. Forty participants traversed a 70 m indoor corridor wearing normal shoes in one trial and walking barefoot in a second trial. Trunk accelerations were recorded with a 3D-accelerometer attached to the lower back. The stability was computed using the finite-time maximal Lyapunov exponent method. Absolute agreement between the forward and backward paths was estimated with the intraclass correlation coefficient (ICC). Barefoot walking did not significantly modify the stability as compared with shod walking (average standardized effect size: +0.11). The intrasession repeatability was high (ICC: 0.73–0.81) and slightly higher in barefoot walking condition (ICC: 0.81–0.87). Therefore, it seems that barefoot walking can be used to evaluate stability without introducing a bias as compared with shod walking, and with a sufficient reliability.

Effect of Load Carrying on Local Dynamic Stability

2007 ◽  
Vol 51 (15) ◽  
pp. 909-913 ◽  
Author(s):  
Jian Liu ◽  
Thurmon E. Lockhart ◽  
Kevin Granata
Keyword(s):  
Dynamic Stability ◽  
Load Condition ◽  
Local Dynamic ◽  
Fall Injuries ◽  
Local Dynamic Stability ◽  
Load Carrying ◽  
Trunk Acceleration ◽  
The Stability ◽  
Major Factors

Occupational load carrying tasks are considered one of the major factors contributing to slip and fall injuries. The objective of the current study was to explore the feasibility to assess the stability changes associated with load carrying by local dynamic stability measures. Twenty-five young participants were involved in a treadmill walking study, with their trunk acceleration profiles measured wirelessly by a tri-axial accelerometer. Finite time local dynamic stability was quantified by maximum Lyapunov exponents (maxLE). The results showed a significant increase in long term maxLE in load condition, indicating the declined local dynamic stability due to the load carrying. Thus, current study confirmed the discriminative validity and sensitivity of local dynamic stability measure and its utility in the load carrying scenario.

Position Sense in the Lumbar Spine with Torso Flexion and Loading

2007 ◽  
Vol 23 (2) ◽  
pp. 93-102 ◽  
Author(s):  
Venkata K. Gade ◽  
Sara E. Wilson
Keyword(s):  
Lumbar Spine ◽  
Dynamic Stability ◽  
Visual Feedback ◽  
Injury Risk ◽  
Position Sense ◽  
Back Injury ◽  
Low Back ◽  
Loading Conditions ◽  
Trunk Flexion ◽  
Moment Load

Proprioception plays an important role in appropriate sensation of spine position, movement, and stability. Previous research has demonstrated that position sense error in the lumbar spine is increased in flexed postures. This study investigated the change in position sense as a function of altered trunk flexion and moment loading independently. Reposition sense of lumbar angle in 17 subjects was assessed. Subjects were trained to assume specified lumbar angles using visual feedback. The ability of the subjects to reproduce this curvature without feedback was then assessed. This procedure was repeated for different torso flexion and moment loading conditions. These measurements demonstrated that position sense error increased significantly with the trunk flexion (40%,p< .05) but did not increase with moment load (p= .13). This increased error with flexion suggests a loss in the ability to appropriately sense and therefore control lumbar posture in flexed tasks. This loss in proprioceptive sense could lead to more variable lifting coordination and a loss in dynamic stability that could increase low back injury risk. This research suggests that it is advisable to avoid work in flexed postures.

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