Lumbar and cervical erector spinae fatigue elicit compensatory postural responses to assist in maintaining head stability during walking.

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Title Lumbar and cervical erector spinae fatigue elicit compensatory postural responses to assist in maintaining head stability during walking.
Author Kavanagh, Justin; Morrison, Steven; Barrett, Rod
Journal Name Journal of Applied Physiology
Year Published 2006
Place of publication United States
Publisher American Physiological Society
Abstract The purpose of this study was to examine how inducing fatigue of the 1) lumbar erector spinae and 2) cervical erector spinae (CES) muscles affected the ability to maintain head stability during walking. Triaxial accelerometers were attached to the head, upper trunk, and lower trunk to measure accelerations in the vertical, anterior-posterior, and mediolateral directions during walking. Using three accelerometers enabled two adjacent upper body segments to be defined: the neck segment and trunk segment. A transfer function was applied to root mean square acceleration, peak power, and harmonic data derived from spectral analysis of accelerations to quantify segmental gain. The structure of upper body accelerations were examined using measures of signal regularity and smoothness. The main findings were that head stability was only affected in the anterior-posterior direction, as accelerations of the head were less regular following CES fatigue. Furthermore, following CES fatigue, the central nervous system altered the attenuation properties of the trunk segment in the anterior-posterior direction, presumably to enhance head stability. Following lumbar erector spinae fatigue, the trunk segment had greater gain and increased regularity and smoothness of accelerations in the mediolateral direction. Overall, the results of this study suggest that erector spinae fatigue differentially altered segmental attenuation during walking, according to the level of the upper body that was fatigued and the direction that oscillations were attenuated. A compensatory postural response was not only elicited in the sagittal plane, where greater segmental attenuation occurred, but also in the frontal plane, where greater segmental gain occurred.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1152/japplphysiol.00165.2006
Volume 101
Page from O1118
Page to O1126
ISSN 8750-7587
Date Accessioned 2006-12-04
Language en_AU
Research Centre Griffith Health Institute; Centre for Musculoskeletal Research
Faculty Griffith Health Faculty
Subject Biomechanics; Motor Control
URI http://hdl.handle.net/10072/14208
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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