NDLI: Effect of natural trunk inclination on variability in soleus inhibition and tibialis anterior activation during gait initiation in young adults.

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Effect of natural trunk inclination on variability in soleus inhibition and tibialis anterior activation during gait initiation in young adults.

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Effect of natural trunk inclination on variability in soleus inhibition and tibialis anterior activation during gait initiation in young adults.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Fortin, Annie-Pier Dessery, Yoann Leteneur, Sébastien Barbier, Frank Corbeil, Philippe
Description	Author Affiliation: Fortin AP ( Université Laval, Département de Kinésiologie, Faculté de Médecine, 2300, rue de la Terrasse, Québec, QC, Canada G1V 0A6. Electronic address: annie-pier.fortin.2@ulaval.ca.); Dessery Y ( Université Laval, Département de Kinésiologie, Faculté de Médecine, 2300, rue de la Terrasse, Québec, QC, Canada G1V 0A6. Electronic address: yoann.dessery.1@ulaval.ca.); Leteneur S ( Université Lille Nord de France, Lille, France); Barbier F ( Université Lille Nord de France, Lille, France); Corbeil P ( Université Laval, Département de Kinésiologie, Faculté de Médecine, 2300, rue de la Terrasse, Québec, QC, Canada G1V 0A6. Electronic address: philippe.corbeil@kin.ulaval.ca.)
Abstract	BACKGROUND: Anticipatory postural adjustments (APAs) of gait initiation (GI) permit first step execution. APAs are characterized by a structured pattern of soleus (SOL) inhibition followed by tibialis anterior (TA) activation. This pattern shows variability among young adults where SOL is not always inhibited before TA activation. Initial posture preceding GI could explain a part of this variability. The aim of the study was to investigate the effect of natural trunk inclination on APAs during GI. METHODS: Two groups of twelve subjects divided by natural trunk inclination angle performed five gait initiation trials. A regression model was computed to predict SOL inhibition and TA activation. RESULTS: Backward leaners showed less SOL inhibition in stance leg (25.8% of trials) compared to forward leaners (55.6% of trials). Regression model revealed that high tonic EMG activity in SOL in the stance leg is the variable that best explains SOL inhibition variation within trials but not TA activation. CONCLUSION: Slight variations in APAs are due to natural trunk inclination but more contribution in APAs is due to initial posture, future step speed and initial tonic soleus activity. Absence of SOL inhibition could be in part explained by natural trunk inclination, where the backward inclination leads to lower tonic SOL activity in quiet standing. These effects could be due to inherent and functional variability, which depend on postural variation, muscular coordination and limb roles.
File Format	HTM / HTML
ISSN	09666362
Issue Number	2
Volume Number	41
e-ISSN	18792219
Journal	Gait & Posture
Language	English
Publisher	Elsevier
Publisher Date	2015-02-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Torso Research Support, Non-u.s. Gov't Discipline Orthopedics Gait Humans Male Journal Article Posture Young Adult Adult Physiology Electromyography Muscle, Skeletal
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Rehabilitation Biophysics Sports Science

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