Document Detail

Muscle activation of vastus medialis obliquus and vastus lateralis during a dynamic leg press exercise with and without isometric hip adduction.
MedLine Citation:
PMID:  23312731     Owner:  NLM     Status:  In-Data-Review    
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° 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° 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° of knee extension/flexion with vigorous hip adduction may be useful in promoting a greater VMO/VL ratio.
Hsien-Te Peng; Thomas W Kernozek; Chen-Yi Song
Publication Detail:
Type:  Journal Article     Date:  2012-06-26
Journal Detail:
Title:  Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine     Volume:  14     ISSN:  1873-1600     ISO Abbreviation:  Phys Ther Sport     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100940513     Medline TA:  Phys Ther Sport     Country:  England    
Other Details:
Languages:  eng     Pagination:  44-9     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Department of Physical Education, Chinese Culture University, Taipei, Taiwan.
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