Delayed onset of electromyographic activity of the vastus medialis relative to the vastus lateralis may be related to physical activity levels in females with patellofemoral pain

The aims of this study were to examine group differences in muscle activation onset of the vastus medialis (VM) in relation to the vastus lateralis (VL) and pain level during stair ascent in females with patellofemoral pain (PFP) who maintain high and moderate levels of physical activity; to determine the association between physical activity level and muscle activation onset. Forty-three females with PFP and thirty-eight pain-free females were recruited and divided into four groups based on their level of physical activity: females with PFP(n=26) and pain-free females(n=26) who practiced a moderate level of physical activity and females with PFP(n=17) and pain-free females(n=12) who practiced an intense amount of physical activity.

Source: Journal of Electromyography and Kinesiology - November 12, 2015 Category: Neurology Authors: Ronaldo Valdir Briani, Danilo de Oliveira Silva, Marcella Ferraz Pazzinatto, Amanda Schenatto Ferreira, Deisi Ferrari, Fábio Mícolis de Azevedo Source Type: research