The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises.
Physiother Res Int
; 21(3): 164-73, 2016 Sep.
Article
em En
| MEDLINE
| ID: mdl-25962352
ABSTRACT
BACKGROUND:
Patellofemoral pain syndrome is an extremely common condition, believed to be caused by altered activation of vastus medialis obliquus (VMO), leading to maltracking of the patella.AIM:
This study aimed to investigate the effect of altering knee movement and squat depth on the ratio of VMO and vastus lateralis (VMO VL) during squat exercises.METHOD:
Eighteen (7 male and 11 female) healthy, asymptomatic participants performed semi-squat exercises with three squat depths (20°, 50° and 80° of knee flexion) while following three knee movement paths (neutral, varus or valgus). Normalized VMO VL ratio from linear envelope surface electromyography was analysed.RESULTS:
No significant effect was found for gender (p = 0.87), leg dominance (p = 0.99) or knee position (p = 0.44). A significant effect was found for squat depth (p < 0.001) with both the 50° and 80° squats showing increases in VMO VL ratio (p = 0.031 and p = 0.028), respectively. The VMO VL ratio was not influenced by gender, leg dominance or knee position in semi-squat exercises. DISCUSSION ANDCONCLUSION:
Increases in relative VMO activation did occur in 'deeper' squat depths (50° and 80° knee flexion) compared with the 20° condition. Further research is needed in this area concerning the effects of such exercise modifications on a symptomatic patellofemoral pain syndrome population. Copyright © 2015 John Wiley & Sons, Ltd.Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Exercício Físico
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Amplitude de Movimento Articular
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Músculo Quadríceps
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Articulação do Joelho
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Contração Muscular
Limite:
Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Physiother Res Int
Assunto da revista:
REABILITACAO
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Austrália