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A paradigm to assess postural responses triggered by anteroposterior translations in healthy seated individuals.

Abstract：

:Postural adjustments following mechanical perturbations have been studied in healthy seated humans. However, little is known on the minimal intensity that should be used to provoke a reaction. This knowledge could be essential to assess seated postural deficits in some pathological populations. The goal of the present study was to identify a low-intensity perturbation that could elicit postural reactions in healthy seated individuals. Six healthy participants sat on an adapted ergonomic chair fixed on a moveable support surface that was submitted to forward and backward translations. The head and trunk kinematics as well as the activity of sixteen neck and trunk muscles were recorded. The head, arm and trunk center of mass was computed using kinematics and standard anthropometric tables. We found that ramp displacements with an acceleration profile reaching a maximal value of 1.17 m/s(2) elicited reliable kinematic and electromyographic reactions across participants. Head and trunk segments initially responded opposite to the direction of translation, then reversed direction. Median peak-to-peak angular displacements in the neck, head and trunk, respectively, reached 3.6 degrees, 7.0 degrees and 7.1 degrees for forward translations, and 4.0 degrees, 8.2 degrees and 7.0 degrees for backward translations. For forward translations, neck and trunk flexor muscles were activated first, followed by the extensor muscles, whereas for backward translations, extensor muscles were activated first, followed by flexors. Although this perturbation is of low-intensity compared to those typically used previously to evoke postural reactions, this stimulus is sufficient to elicit a reliable response. We suggest that such a perturbation could be used to assess the physical condition of individuals with neck injuries.

journal_name

Gait Posture

journal_title

Gait & posture

authors

St-Onge N,Côté JN,Patenaude I,Fung J

doi

10.1016/j.gaitpost.2009.06.007

subject

Has Abstract

pub_date

2009-11-01 00:00:00

pages

417-23

issue

4

eissn

0966-6362

issn

1879-2219

pii

S0966-6362(09)00162-3

journal_volume

30

pub_type

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