Document Detail

Electromyographic preactivation pattern of the gluteus medius during weight-bearing functional tasks in women with and without anterior knee pain.
MedLine Citation:
PMID:  21390470     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Proximal factors have been proposed to influence the biomechanics of the patellofemoral joint. A delayed or diminished gluteus medius (GM) activation, before the foot contact on the ground during functional activities could lead to excessive femur adduction and internal rotation and be associated with anterior knee pain (AKP). There are few studies on this topic and the results were inconclusive, therefore, it is necessary to investigate the GM preactivation pattern during functional activities.
OBJECTIVE: To compare the GM electromyographic (EMG) preactivation pattern during walking, descending stairs and in single leg jump task in women with and without AKP.
METHODS: Nine women clinically diagnosed with AKP and ten control subjects with no history of knee injury participated in this study. We evaluated GM EMG linear envelope before the foot contact on the ground during walking and GM onset time and EMG linear envelope during descending stairs as well as in a single leg vertical jump. Mann-Whitney U tests were used to determine the between-group differences in GM EMG preactivation pattern.
RESULTS: No between-group differences were observed in GM linear envelope during walking (P=0.41), GM onset time and linear envelope during descending stairs (P=0.17 and P=0.15) and single leg jump (P=0.81 and P=0.33).
CONCLUSIONS: Women with AKP did not demonstrated altered GM preactivation pattern during functional weight bearing activities. Our results did not support the hypothesis that poor GM preactivation pattern could be associated with AKP.
Theresa H Nakagawa; Thiago B Muniz; Rodrigo M Baldon; Carlos D Maciel; César F Amorim; Fábio V Serrão
Publication Detail:
Type:  Journal Article     Date:  2011-03-04
Journal Detail:
Title:  Revista brasileira de fisioterapia (São Carlos (São Paulo, Brazil))     Volume:  15     ISSN:  -     ISO Abbreviation:  Rev Bras Fisioter     Publication Date:    2011 Jan-Feb
Date Detail:
Created Date:  2011-04-26     Completed Date:  2011-09-29     Revised Date:  2013-08-21    
Medline Journal Info:
Nlm Unique ID:  101186153     Medline TA:  Rev Bras Fisioter     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  59-65     Citation Subset:  IM    
Physical Therapy Department, Universidade Federal de São Carlos, São Carlos, SP, Brazil.
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MeSH Terms
Case-Control Studies
Muscle, Skeletal / physiopathology*
Patellofemoral Pain Syndrome / physiopathology*
Weight-Bearing / physiology*
Young Adult

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