Effect of inversion and ankle bracing on peroneus longus Hoffmann reflex.

Full Abstract

This study examined peroneus longus (PL) Hoffmann reflex (H-reflex) during sudden inversion perturbation of the ankle/foot complex under an ankle brace and non-brace condition. Ten healthy subjects volunteered. H-reflexes were tested on the up-sloping portion of the recruitment curve, utilizing a control trial M-wave above motor threshold to maintain consistency between subjects and conditions. The PL H/maximum M-wave (M(max)) ratio was established using the PL H-reflex and PL M(max) peak-to-peak measures. The mean ratio across five trials for each subject under each ankle brace (brace, no brace) and surface (flat, inversion) conditions was utilized for analysis. The 1 x 4 repeated measures ANOVA revealed a significant main effect for treatment condition (P<0.0001). The PL H/M(max) ratio significantly increased during sudden inversion-no ankle brace condition compared with the flat surface no-ankle brace condition (P=0.04). Application of an ankle brace had no effect on PL H/M(max) ratio during inversion (P=0.78). During this study PL H/M(max) ratios increased during an inversion perturbation in healthy ankles. This is believed to occur due to heightened sensorimotor demand placed on the nervous system during this motion. Moreover, application of an ankle brace during inversion does not appear to affect PL H/M(max) ratio.

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Author information

Author/s: Sefton, J M (JM); Hicks-Little, C A (CA); Koceja, D M (DM); Cordova, M L (ML);

Affiliation: Biodynamics Research Laboratory, Department of Kinesiology, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA. jmsefton(-atsign-)email.uncc.edu

Journal and publication information

Publication Type: Journal Article

Journal: Scandinavian journal of medicine & science in sports (Scand J Med Sci Sports), published in Denmark. (Language: eng)

Reference: 2007-Oct; vol 17 (issue 5) : pp 539-46

Dates: Created 2007/11/09; Completed 2008/01/08;

PMID: 17076833, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult
Ankle - pathology
Ankle Injuries - prevention & control
Braces
Female
Humans

Male
Motor Neurons - physiology
Muscle, Skeletal
Prospective Studies
Reflex, Abnormal
Weight-Bearing - physiology

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