Document Detail

A comparison of electromyography of gluteus medius and maximus in subjects with and without chronic ankle instability during two functional exercises.
MedLine Citation:
PMID:  23312728     Owner:  NLM     Status:  In-Data-Review    
OBJECTIVE: To determine how gluteus medius (Gmed) and maximus (Gmax) activate during closed-chain functional rehabilitative exercises in those with and without chronic ankle instability (CAI).
DESIGN: Cohort study. Subjects performed ten repetitions of a rotational lunge and single-leg rotational squat while surface electromyography was used to collect mean muscle activity of the Gmed and Gmax.
MAIN OUTCOME MEASURES: Mean electromyography activity of the Gmed and Gmax at maximum excursion was compared between Groups and Exercises using a separate 2-way repeated measures analysis of variance design for each muscle.
SETTING: University biomechanics lab.
PARTICIPANTS: Nine healthy (8F, 1M) and nine CAI subjects (8F, 1M) RESULTS: For Gmax activation, there was a statistically significant Group by Exercise interaction (F(3,48) = 4.84, p = 0.043). A Scheffe's post-hoc test revealed that during the rotational squat, the CAI group had significantly lower Gmax activation (51.1 ± 31.0%) than the healthy group (78.6 ± 44.8%). There were no statistically significant findings for the Gmed. In the healthy group, the Gmax produced significantly higher activation during rotational squat (78.6 ± 44.8%) compared to the rotational lunge (57.6 ± 31.9%).
CONCLUSION: Because the CAI group had significantly less Gmax activation than the healthy group during the rotational squat at the point of maximum excursion, and because the rotational squat showed significantly higher Gmax activation compared to the rotational lunge, it may be important for clinicians to implement the rotational squat during rehabilitation for those with CAI. Future prospective and intervention research involving hip musculature in those with CAI is recommended.
Kathryn A Webster; Phillip A Gribble
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Publication Detail:
Type:  Journal Article     Date:  2012-05-01
Journal Detail:
Title:  Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine     Volume:  14     ISSN:  1873-1600     ISO Abbreviation:  Phys Ther Sport     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100940513     Medline TA:  Phys Ther Sport     Country:  England    
Other Details:
Languages:  eng     Pagination:  17-22     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Boston University, Dept. of Physical Therapy and Athletic Training, 635 Commonwealth Ave., Boston, MA 02215, USA. Electronic address:
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