Intrinsic foot muscles have the capacity to control deformation of the longitudinal arch

Kelly, Luke A., Cresswell, Andrew G., Racinais, Sebastien, Whiteley, Rodney and Lichtwark, Glen (2014) Intrinsic foot muscles have the capacity to control deformation of the longitudinal arch. Journal of the Royal Society Interface, 11 93: 20131188.1-20131188.9. doi:10.1098/rsif.2013.1188


Author Kelly, Luke A.
Cresswell, Andrew G.
Racinais, Sebastien
Whiteley, Rodney
Lichtwark, Glen
Title Intrinsic foot muscles have the capacity to control deformation of the longitudinal arch
Journal name Journal of the Royal Society Interface   Check publisher's open access policy
ISSN 1742-5689
1742-5662
Publication date 2014-04-06
Year available 2014
Sub-type Article (original research)
DOI 10.1098/rsif.2013.1188
Open Access Status DOI
Volume 11
Issue 93
Start page 20131188.1
End page 20131188.9
Total pages 9
Place of publication London, United Kingdom
Publisher Royal Society of London
Language eng
Abstract The human foot is characterized by a pronounced longitudinal arch (LA) that compresses and recoils in response to external load during locomotion, allowing for storage and return of elastic energy within the passive structures of the arch and contributing to metabolic energy savings. Here, we examine the potential for active muscular contribution to the biomechanics of arch deformation and recoil. We test the hypotheses that activation of the three largest plantar intrinsic foot muscles, abductor hallucis, flexor digitorum and quadratus plantae is associated with muscle stretch in response to external load on the foot and that activation of these muscles (via electrical stimulation) will generate sufficient force to counter the deformation of LA caused by the external load. We found that recruitment of the intrinsic foot muscles increased with increasing load, beyond specific load thresholds. Interestingly, LA deformation and muscle stretch plateaued towards the maximum load of 150% body weight, when muscle activity was greatest. Electrical stimulation of the plantar intrinsic muscles countered the deformation that occurred owing to the application of external load by reducing the length and increasing the height of the LA. These findings demonstrate that these muscles have the capacity to control foot posture and LA stiffness and may provide a buttressing effect during foot loading. This active arch stiffening mechanism may have important implications for how forces are transmitted during locomotion and postural activities as well as consequences for metabolic energy saving.
Keyword Multi-segment foot model
Foot stiffness
Electromyography
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Human Movement and Nutrition Sciences Publications
 
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