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Swiss ball abdominal crunch with added elastic resistance is an effective alternative to training machines.
MedLine Citation:
PMID:  22893857     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Swiss ball training is recommended as a low intensity modality to improve joint position, posture, balance, and neural feedback. However, proper training intensity is difficult to obtain during Swiss ball exercises whereas strengthening exercises on machines usually are performed to induce high level of muscle activation.
PURPOSE: To compare muscle activation as measured by electromyography (EMG) of global core and thigh muscles during abdominal crunches performed on Swiss ball with elastic resistance or on an isotonic training machine when normalized for training intensity.
METHODS: 42 untrained individuals (18 men and 24 women) aged 28-67 years participated in the study. EMG activity was measured in 13 muscles during 3 repetitions with a 10 RM load during both abdominal crunches on training ball with elastic resistance and in the same movement utilizing a training machine (seated crunch, Technogym, Cesena, Italy). The order of performance of the exercises was randomized, and EMG amplitude was normalized to maximum voluntary isometric contraction (MVIC) EMG.
RESULTS: When comparing between muscles, normalized EMG was highest in the rectus abdominis (P<0.01) and the external obliques (P<0.01). However, crunches on Swiss ball with elastic resistance showed higher activity of the rectus abdominis than crunches performed on the machine (104±3.8 vs 84±3.8% nEMG respectively, P<0.0001). By contrast, crunches performed on Swiss ball induced lower activity of the rectus femoris than crunches in training machine (27±3.7 vs 65±3.8% nEMG respectively, P<0.0001) Further, gender, age and musculoskeletal pain did not significantly influence the findings.
CONCLUSION: Crunches on a Swiss ball with added elastic resistance induces high rectus abdominis activity accompanied by low hip flexor activity which could be beneficial for individuals with low back pain. In opposition, the lower rectus abdominis activity and higher rectus femoris activity observed in machine warrant caution for individuals with lumbar pain. Importantly, both men and women, younger and elderly, and individuals with and without pain benefitted equally from the exercises.
Authors:
Emil Sundstrup; Markus D Jakobsen; Christoffer H Andersen; Kenneth Jay; Lars L Andersen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of sports physical therapy     Volume:  7     ISSN:  2159-2896     ISO Abbreviation:  Int J Sports Phys Ther     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-08-15     Completed Date:  2012-10-02     Revised Date:  2013-05-30    
Medline Journal Info:
Nlm Unique ID:  101553140     Medline TA:  Int J Sports Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  372-80     Citation Subset:  -    
Affiliation:
National Research Centre for the Working Environment, Copenhagen, Denmark.
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