Muscle activation of vastus medialis obliquus and vastus lateralis during a dynamic leg press exercise with and without isometric hip adduction
Resource
Phys. Ther. Sport, 14(1), 44-49
Journal
Physical Therapy in Sport
Pages
44-49
Date Issued
2013
Date
2013
Author(s)
Peng, Hsien-Te
Kernozek, Thomas W.
Song, Chen-Yi
Abstract
Objectives: To investigate the effects of submaximal and vigorous isometric hip adduction on the vastus medialis obliquus (VMO) and vastus lateralis (VL) activity during the leg press exercise from 90 degrees of knee flexion until full extension. ;Design: Experimental. ;Setting: University biomechanics laboratory. ;Participants: Ten healthy male college students. ;Main outcome measures: Electromyographic (EMG) activation of VMO, VL and hip adductor longus (HAL) of the dominant leg were recorded during double leg press (LP), leg press with submaximal isometric hip adduction force (LP+), and leg press with vigorous isometric hip adduction force (LP++). The VMO, VL muscle activation, as well as the VMO/VL ratio between different leg press exercises were analyzed by MANOVA over concentric and eccentric phases, and in 15 degrees increments of knee flexion motion. The effect size was calculated. ;Results: Neither LP+ nor LP++ changed the overall VMO-VL activation patterns. Specific to knee angle, however, small to medium effect size was shown with incorporation of isometric hip adduction to the leg press exercise for VMO/VL ratio. ;Conclusion: Targeted training using the leg press exercise to the last 45 degrees of knee extension/flexion with vigorous hip adduction may be useful in promoting a greater VMO/VL ratio. (C) 2012 Elsevier Ltd. All rights reserved.
Subjects
Knee
Quadriceps
Patellofemoral
PFPS
SDGs
Other Subjects
adduction; adult; article; biomechanics; clinical trial; college student; concentric muscle contraction; controlled study; eccentric muscle contraction; effect size; electromyogram; hip; human; isometric exercise; knee function; leg exercise; male; muscle contraction; muscle stretching; normal human; patellofemoral joint; priority journal; quadriceps femoris muscle; vastus lateralis muscle; vastus medialis muscle; Biomechanics; Electromyography; Exercise; Hip Joint; Humans; Isometric Contraction; Knee Joint; Leg; Male; Quadriceps Muscle; Range of Motion, Articular; Young Adult