Recruitment of the plantar intrinsic foot muscles with increasing postural demand

Kelly, Luke A., Kuitunen, Sami, Racinais, Sebastien and Cresswell, Andrew G. (2012) Recruitment of the plantar intrinsic foot muscles with increasing postural demand. Clinical Biomechanics, 27 1: 46-51. doi:10.1016/j.clinbiomech.2011.07.013

Author Kelly, Luke A.
Kuitunen, Sami
Racinais, Sebastien
Cresswell, Andrew G.
Title Recruitment of the plantar intrinsic foot muscles with increasing postural demand
Journal name Clinical Biomechanics   Check publisher's open access policy
ISSN 0268-0033
Publication date 2012-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.clinbiomech.2011.07.013
Open Access Status
Volume 27
Issue 1
Start page 46
End page 51
Total pages 6
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2012
Language eng
Formatted abstract
Background: The aim of this study was to determine the difference in activation patterns of the plantar intrinsic footmuscles during two quiet standing tasks with increasing postural difficulty. We hypothesised that activation of these muscles would increase with increasing postural demand and be correlated with postural sway.

Methods: Intra-muscular electromyographic (EMG) activity was recorded from abductor hallucis, flexor digitorumbrevis and quadratus plantae in 10 healthy participants while performing two balance tasks of graded difficulty (double leg stance and single leg stance). These two standing postures were used to appraise any relationship between postural sway and intrinsic foot muscle activity.

Findings: Single leg stance compared to double leg stance resulted in greater mean centre of pressure speed (0.24 m s−1 versus 0.06 m s−1, respectively, P≤0.05) and greater mean EMG amplitude for abductor hallucis (P≥0.001, ES=0.83), flexor digitorum brevis (P≤0.001, ES=0.79) and quadratus plantae (P≤0.05, ES=0.4). EMG amplitude waveforms for all muscles were moderate to strongly correlated to centre of pressure (CoP) medio-lateral waveforms (all r≥0.4), with muscle activity amplitude increasing with medial deviations of theCoP. Intra-muscular EMG waveforms were all strongly correlated with each other (all r≥0.85).

: Activation of the plantar intrinsic foot muscles increases with  increasing postural demand. These muscles are clearly important in postural control and are recruited in a highly co-ordinated manner to stabilise the foot and maintain balance in the medio-lateral direction, particularly during single leg stance.
Keyword Electromyography
Intrinsic foot muscles
Postural control
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 23 August 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Human Movement and Nutrition Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 24 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 20 Oct 2011, 10:50:10 EST by Deborah Noon on behalf of School of Human Movement and Nutrition Sciences