Document Detail


Effect of Squat Depth and Barbell Load on Relative Muscular Effort in Squatting.
MedLine Citation:
PMID:  22797000     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
ABSTRACT: Resistance training is used to develop muscular strength and hypertrophy. Large muscle forces, in relation to the muscle's maximum force generating ability, are required to elicit these adaptations. Previous biomechanical analyses of multi-joint resistance exercises provide estimates of muscle force but not relative muscular effort (RME). The purpose of this investigation was to determine the relative muscular effort (RME) during squat exercise. Specifically the effects of barbell load and squat depth on hip extensor, knee extensor and ankle plantar-flexor RME were examined. Ten strength-trained women performed squats (50-90% 1 RM) in a motion analysis laboratory to determine hip extensor, knee extensor and ankle plantar-flexor net joint moment (NJM). Maximum isometric strength in relation to joint angle for these muscle groups was also determined. RME was determined as the ratio of NJM to maximum voluntary torque matched for joint angle. Barbell load and squat depth had significant interaction effects on hip extensor, knee extensor and ankle plantar-flexor RME (p<0.05). Knee extensor RME increased with greater squat depth but not barbell load, whereas the opposite was found for the ankle plantar-flexors. Both greater squat depth and barbell load increased hip extensor RME. These data suggest training for the knee extensors can be performed with low relative intensities but require a deep squat depth. Heavier barbell loads are required to train the hip extensors and ankle plantar-flexors. In designing resistance training programs with multi-joint exercises, how external factors influence RME of different muscle groups should be considered to meet training objectives.
Authors:
Megan A Bryanton; Michael D Kennedy; Jason P Carey; Loren Z F Chiu
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-12
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Neuromusculoskeletal Mechanics Research Program, Faculty of Physical Education and Recreation, University of Alberta, Edmonton, AB, Canada 2Faculty of Physical Education and Recreation, University of Alberta, Edmonton, AB, Canada 3Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada.
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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