Effects of vision and lumbar posture on trunk neuromuscular control

E. Maaswinkel, P. van Drunen, H.E.J. Veeger, J.H. van Dieen

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The goal of this study was to determine the effects of vision and lumbar posture on trunk neuromuscular control. Torso perturbations were applied with a pushing device while the subjects were restrained at the pelvis in a kneeling-seated position. Torso kinematics and the muscle activity of the lumbar part of the M. Longissimus were recorded for 14 healthy subjects. Four conditions were included: a flexion, extension and neutral lumbar posture with eyes closed and the neutral posture with eyes open. Frequency response functions of the admittance and reflexes showed that there was no significant difference between the eyes open and eyes closed conditions, thereby confirming that vision does not play a role in the stabilization of the trunk during small-amplitude trunk perturbations. In contrast, manipulating posture did lead to significant differences. In particular, the flexed condition led to a lower admittance and lower reflex contribution compared to the neutral condition. Furthermore, the muscle pre-activation (prior to the onset of the perturbation) was significantly lower in the flexed posture compared to neutral. This confirms that flexing the lumbar spine increases the passive tissue stiffness and decreases the contribution of reflex activity to trunk control.
Original languageEnglish
Pages (from-to)298-303
JournalJournal of Biomechanics
Volume2015
Issue number48
DOIs
Publication statusPublished - 2015

Fingerprint

Posture
Muscle
Frequency response
Reflex
Torso
Kinematics
Stabilization
Chemical activation
Stiffness
Tissue
Muscles
Pelvis
Biomechanical Phenomena
Healthy Volunteers
Spine
Equipment and Supplies

Cite this

@article{1c3195a616214821b1c02cd359cbdbb1,
title = "Effects of vision and lumbar posture on trunk neuromuscular control",
abstract = "The goal of this study was to determine the effects of vision and lumbar posture on trunk neuromuscular control. Torso perturbations were applied with a pushing device while the subjects were restrained at the pelvis in a kneeling-seated position. Torso kinematics and the muscle activity of the lumbar part of the M. Longissimus were recorded for 14 healthy subjects. Four conditions were included: a flexion, extension and neutral lumbar posture with eyes closed and the neutral posture with eyes open. Frequency response functions of the admittance and reflexes showed that there was no significant difference between the eyes open and eyes closed conditions, thereby confirming that vision does not play a role in the stabilization of the trunk during small-amplitude trunk perturbations. In contrast, manipulating posture did lead to significant differences. In particular, the flexed condition led to a lower admittance and lower reflex contribution compared to the neutral condition. Furthermore, the muscle pre-activation (prior to the onset of the perturbation) was significantly lower in the flexed posture compared to neutral. This confirms that flexing the lumbar spine increases the passive tissue stiffness and decreases the contribution of reflex activity to trunk control.",
author = "E. Maaswinkel and {van Drunen}, P. and H.E.J. Veeger and {van Dieen}, J.H.",
year = "2015",
doi = "10.1016/j.jbiomech.2014.11.030",
language = "English",
volume = "2015",
pages = "298--303",
journal = "Journal of Biomechanics",
issn = "0021-9290",
publisher = "Elsevier Limited",
number = "48",

}

Effects of vision and lumbar posture on trunk neuromuscular control. / Maaswinkel, E.; van Drunen, P.; Veeger, H.E.J.; van Dieen, J.H.

In: Journal of Biomechanics, Vol. 2015, No. 48, 2015, p. 298-303.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - Effects of vision and lumbar posture on trunk neuromuscular control

AU - Maaswinkel, E.

AU - van Drunen, P.

AU - Veeger, H.E.J.

AU - van Dieen, J.H.

PY - 2015

Y1 - 2015

N2 - The goal of this study was to determine the effects of vision and lumbar posture on trunk neuromuscular control. Torso perturbations were applied with a pushing device while the subjects were restrained at the pelvis in a kneeling-seated position. Torso kinematics and the muscle activity of the lumbar part of the M. Longissimus were recorded for 14 healthy subjects. Four conditions were included: a flexion, extension and neutral lumbar posture with eyes closed and the neutral posture with eyes open. Frequency response functions of the admittance and reflexes showed that there was no significant difference between the eyes open and eyes closed conditions, thereby confirming that vision does not play a role in the stabilization of the trunk during small-amplitude trunk perturbations. In contrast, manipulating posture did lead to significant differences. In particular, the flexed condition led to a lower admittance and lower reflex contribution compared to the neutral condition. Furthermore, the muscle pre-activation (prior to the onset of the perturbation) was significantly lower in the flexed posture compared to neutral. This confirms that flexing the lumbar spine increases the passive tissue stiffness and decreases the contribution of reflex activity to trunk control.

AB - The goal of this study was to determine the effects of vision and lumbar posture on trunk neuromuscular control. Torso perturbations were applied with a pushing device while the subjects were restrained at the pelvis in a kneeling-seated position. Torso kinematics and the muscle activity of the lumbar part of the M. Longissimus were recorded for 14 healthy subjects. Four conditions were included: a flexion, extension and neutral lumbar posture with eyes closed and the neutral posture with eyes open. Frequency response functions of the admittance and reflexes showed that there was no significant difference between the eyes open and eyes closed conditions, thereby confirming that vision does not play a role in the stabilization of the trunk during small-amplitude trunk perturbations. In contrast, manipulating posture did lead to significant differences. In particular, the flexed condition led to a lower admittance and lower reflex contribution compared to the neutral condition. Furthermore, the muscle pre-activation (prior to the onset of the perturbation) was significantly lower in the flexed posture compared to neutral. This confirms that flexing the lumbar spine increases the passive tissue stiffness and decreases the contribution of reflex activity to trunk control.

U2 - 10.1016/j.jbiomech.2014.11.030

DO - 10.1016/j.jbiomech.2014.11.030

M3 - Article

VL - 2015

SP - 298

EP - 303

JO - Journal of Biomechanics

JF - Journal of Biomechanics

SN - 0021-9290

IS - 48

ER -