Effect of inversion and ankle bracing on peroneus longus Hoffmann reflex
J. M. Sefton
Biodynamics Research Laboratory, Department of Kinesiology, The University of North Carolina at Charlotte, Charlotte, North Carolina, USA,
Search for more papers by this authorC. A. Hicks-Little
Biodynamics Research Laboratory, Department of Kinesiology, The University of North Carolina at Charlotte, Charlotte, North Carolina, USA,
Search for more papers by this authorD. M. Koceja
Motor Control Laboratory, Department of Kinesiology & Program in Neural Science, Indiana University, Bloomington, Indiana, USA,
Search for more papers by this authorM. L. Cordova
Biodynamics Research Laboratory, Department of Kinesiology, The University of North Carolina at Charlotte, Charlotte, North Carolina, USA,
Center for Biomedical Engineering Systems, Department of Mechanical Engineering and Engineering Science, The University of North Carolina at Charlotte, Charlotte, North Carolina, USA
Search for more papers by this authorJ. M. Sefton
Biodynamics Research Laboratory, Department of Kinesiology, The University of North Carolina at Charlotte, Charlotte, North Carolina, USA,
Search for more papers by this authorC. A. Hicks-Little
Biodynamics Research Laboratory, Department of Kinesiology, The University of North Carolina at Charlotte, Charlotte, North Carolina, USA,
Search for more papers by this authorD. M. Koceja
Motor Control Laboratory, Department of Kinesiology & Program in Neural Science, Indiana University, Bloomington, Indiana, USA,
Search for more papers by this authorM. L. Cordova
Biodynamics Research Laboratory, Department of Kinesiology, The University of North Carolina at Charlotte, Charlotte, North Carolina, USA,
Center for Biomedical Engineering Systems, Department of Mechanical Engineering and Engineering Science, The University of North Carolina at Charlotte, Charlotte, North Carolina, USA
Search for more papers by this authorAbstract
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 (Mmax) ratio was established using the PL H-reflex and PL Mmax 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 × 4 repeated measures ANOVA revealed a significant main effect for treatment condition (P<0.0001). The PL H/Mmax 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/Mmax ratio during inversion (P=0.78). During this study PL H/Mmax 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/Mmax ratio.
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