Document Detail

Three dimensional musculoskeletal modelling of the abdominal crunch resistance training exercise.
MedLine Citation:
PMID:  23025339     Owner:  NLM     Status:  Publisher    
Abstract The aim of this study was to evaluate the benefits and limitations of using three dimensional (3D) musculoskeletal modelling (LifeModeler(TM)) in assessing the safety and efficacy of exercising on an abdominal crunch resistance training machine. Three anthropometric cases were studied, representing a 5(th) percentile female, and 50(th) percentile and 95(th) percentile male. Results indicated that the LifeModeler(TM) default model was capable of solving the forward dynamics simulations without adjustments. The modelling was able to indicate high risk for back injury when performing the abdominal crunch exercise as a result of the unacceptable intervertebral joint loading that occurs during the exercise. Individuals with small anthropometric dimensions such as some females and children cannot be accommodated suitably on the abdominal crunch machine which negatively impacts exercise posture and technique. Hip flexor muscle contribution in the execution of the exercise for the 5(th) percentile female was substantial thus reducing the efficacy of the exercise in isolating the abdominal muscles.
Kim Nolte; Pieter E Krüger; P Schalk Els; Heinrich Nolte
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-2
Journal Detail:
Title:  Journal of sports sciences     Volume:  -     ISSN:  1466-447X     ISO Abbreviation:  J Sports Sci     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8405364     Medline TA:  J Sports Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
a University of Pretoria, Biokinetics, Sport and Leisure Sciences, LC de Villiers Sports Centre , South Street , Hatfield , Pretoria , 0002 , South Africa.
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