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European Spine Journal

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01-12-2013 | Original Article

Precision of estimates of local stability of repetitive trunk movements

Authors: Arnaud Dupeyron, Sietse M. Rispens, Christophe Demattei, Jaap H. van Dieën

Published in: European Spine Journal | Issue 12/2013

Abstract

Purpose

Local dynamic stability of trunk movements quantified by means of the maximum Lyapunov exponent (λ_max) can provide information on trunk motor control and might offer a measure of trunk control in low-back pain patients. It is unknown how many repetitions are necessary to obtain sufficiently precise estimates of λ_max and whether fatigue effects on λ_max can be avoided while increasing the number of repetitions.

Method

Ten healthy subjects performed 100 repetitions of trunk movements in flexion, of trunk rotation and of a task combining these movement directions. λ_max was calculated from thorax, pelvis and trunk (thorax relative to pelvis) kinematics. Data series were analyzed using a bootstrap procedure; ICC and coefficient of variation were used to quantify precision as a function of the number of cycles analyzed. ANOVA was used to compare movement tasks and to test for effects of time.

Results

Trunk local stability reached acceptable precision level after 30 repetitions. λ_max was higher (indicating lower stability) in flexion, compared to rotation and combined tasks. There was no time effect (fatigue). λ_max of trunk movement was lower and less variable than that of thorax and pelvis movements.

Conclusions

The data provided allow for an informed choice of the number of repetitions in assessing local dynamic stability of trunk movements, weighting the gain in precision against the increase in measurement effort. Within the 100 repetitions tested, fatigue did not affect results. We suggest that increased stability during asymmetric movement may be explained by higher co-activation of trunk muscles.

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Title: Precision of estimates of local stability of repetitive trunk movements
Authors: Arnaud Dupeyron
Sietse M. Rispens
Christophe Demattei
Jaap H. van Dieën
Publication date: 01-12-2013
Publisher: Springer Berlin Heidelberg
Published in: European Spine Journal / Issue 12/2013
Print ISSN: 0940-6719
Electronic ISSN: 1432-0932
DOI: https://doi.org/10.1007/s00586-013-2797-2

At a glance: The STEP trials

Springer Medicine

Precision of estimates of local stability of repetitive trunk movements

Abstract

Purpose

Method

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Method

Results

Conclusions

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