The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises

Abstract

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.

Effects of Altering Foot Position on Quadriceps Femoris Activation during Wall Squat Exercises

“…In addition, gender and the ground environment when squatting may also be one of the influencing factors. However, the effects of these conditions on quadriceps femoris muscles have been studied by many people [17][18][19]. These studies were mainly aimed at general squatting positions such as partial squatting, half squatting, parallel squatting, full squatting and deep squatting [20].…”

Muscle activity of the vastus medialis obliquus during squat motion after static stretching of the tensor fasciae latae

“…Preventing knee pathologies is very important in rehabilitation. One of the cause of knee pathologies is considered to be maltracking of the patella due to weak activity of the vastus medialis obliquus (VMO) compared to the vastus lateralis (VL) 1,2) . The relative activation of these muscles can be measured using electromyography (EMG).…”

“…Closed-kinetic chain exercises, such as squat motions, are commonly recommended for preventing knee pathologies, as such exercises supposedly promote functional stability 5) , and have often been used as a variable motion in previous studies of VMO/VL and VMO-VL 1,6) . As a method of squat motion, examination of VMO/VL according to differences in the position of the lower extremity has been performed 1,3) . Changes in relative VMO muscle activity may also be caused by changes in muscle flexibility, as well as changes in position.…”

Análisis electromiográfico de la coactivación de cuádriceps e isquiotibiales en jugadores de fútbol

“…Se ha identificado que un ratio bajo de I/C causa mayor tensión en el LCA. También se ha usado la EMG para medir ratio medial-lateral (Jaberzadeh, Yeo, & Zoghi, 2016;Schaub & Worrell, 1995).…”

“…En cuanto a ejercicios propios de la rehabilitación, la literatura ha estudiado numerosos ejercicios en el mundo del fútbol como facilitadores de ganancia de fuerza en los isquiotibiales. Los ejercicios descritos son, entre otros: zancadas, sentadillas y ejercicios con máquinas, principalmente extensión cuádriceps y femoral tumbado (Begalle et al, 2012;Boudreau et al, 2009;Bourne et al, 2018;Dedinsky et al, 2017;Ebben, 2009;Jaberzadeh et al, 2016;Torres et al, 2020;Wright et al, 2009;Wright et al, 1999). La sentadilla y algunas de sus variantes han confirmado tener una activación media de los isquiotibiales, por lo que no producen óptimas ganancias de fuerza, sin embargo se han propuesto muy adecuados como ejercicios facilitadores en las primeras fases de los protocolos de rehabilitación de la lesión (Andersen et al, 2006;Comfort et al, 2009;Isear, Erickson, & Worrell, 1997).…”