Document Detail


Muscle activation and perceived loading during rehabilitation exercises: comparison of dumbbells and elastic resistance.
MedLine Citation:
PMID:  20133444     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: High-intensity resistance training plays an essential role in the prevention and rehabilitation of musculoskeletal injuries and disorders. Although resistance exercises with heavy weights yield high levels of muscle activation, the efficacy of more user-friendly forms of exercise needs to be examined. OBJECTIVE: The aim of this study was to investigate muscle activation and perceived loading during upper-extremity resistance exercises with dumbbells compared with elastic tubing. DESIGN: A single-group, repeated-measures study design was used. SETTING: Exercise evaluation was conducted in a laboratory setting. PARTICIPANTS: Sixteen female workers (aged 26-55 years) without serious musculoskeletal diseases and with a mean neck and shoulder pain intensity of 7.8 on a 100-mm visual analog scale participated in the study. MEASUREMENTS: Electromyographic (EMG) activity was measured in 5 selected muscles during the exercises of lateral raise, wrist extension, and shoulder external rotation during graded loadings with dumbbells (2-7.5 kg) and elastic tubing (Thera-Band, red to silver resistance). The order of exercises and loadings was randomized for each individual. Electromyographic amplitude was normalized to the absolute maximum EMG amplitude obtained during maximal voluntary isometric contraction and exercise testing. Immediately after each set of exercise, the Borg CR10 scale was used to rate perceived loading during the exercise. RESULTS: Resistance exercise with dumbbells as well as elastic tubing showed increasing EMG amplitude and perceived loading with increasing resistance. At the individually maximal level of resistance for each exercise-defined as the 3 repetitions maximum-normalized EMG activity of the prime muscles was not significantly different between dumbbells (59%-87%) and elastic tubing (64%-86%). Perceived loading was moderately to very strongly related to normalized EMG activity (r=.59-.92). Limitations The results of this study apply only for exercises performed in a controlled manner (ie, without sudden jerks or high acceleration). CONCLUSIONS: Comparably high levels of muscle activation were obtained during resistance exercises with dumbbells and elastic tubing, indicating that therapists can choose either type in clinical practice. The Borg CR10 can be a useful aid in estimating intensity of individual rehabilitation protocols.
Authors:
Lars L Andersen; Christoffer H Andersen; Ole S Mortensen; Otto M Poulsen; Inger Birthe T Bj?rnlund; Mette K Zebis
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-02-04
Journal Detail:
Title:  Physical therapy     Volume:  90     ISSN:  1538-6724     ISO Abbreviation:  Phys Ther     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-02     Completed Date:  2010-05-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0022623     Medline TA:  Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  538-49     Citation Subset:  AIM; IM    
Affiliation:
National Research Centre for the Working Environment, Lers? Parkalle 105, DK 2100 Copenhagen, Denmark. LLA@NRCWE.DK
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MeSH Terms
Descriptor/Qualifier:
Adult
Electromyography*
Female
Humans
Isometric Contraction / physiology
Middle Aged
Muscle, Skeletal / physiology*
Resistance Training / instrumentation*
Upper Extremity / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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