Document Detail


Effect of hand position on EMG activity of the posterior shoulder musculature during a horizontal abduction exercise.
MedLine Citation:
PMID:  23302754     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
ABSTRACT: The reverse fly machine is a popular exercise for strengthening the horizontal shoulder abductors including the posterior deltoid. . There seems to be little consensus as to which hand position most effectively targets the posterior deltoid despite this option on most machines. This study investigated the impact of varying one's hand position, and consequently altering shoulder joint rotation, on muscle activity in various glenohumeral muscles during exercise on the reverse fly machine. Nineteen resistance trained men (mean age = 23.2 ± 4.3 years; height =176.9 ± 7.1 centimeters; body mass = 81.3 ± 10.5 kilograms; body mass index = 25.9 ± 2.6) were recruited from a university population to participate in the study. In a repeated measures design, subjects grasped the hand bars on the machine with either a pronated (PRO) or neutral (NEU) grip and performed dynamic horizontal abduction repetitions to muscular failure using a load equating to approximately 75% body weight. The order of performance of the hand positions was counterbalanced between participants so that approximately half of the subjects performed PRO first and the other half performed NEU first. Surface electromyography was used to record both mean and peak muscle activity of the posterior deltoid, middle deltoid, and infraspinatus. Results showed that mean EMG activity for the posterior deltoid was significantly greater in NEU compared to PRO (p = 0.046; 95% CI = 0.1 to 7.4% MVIC). Similarly, mean EMG activity of the infraspinatus also was significantly greater in NEU compared to PRO (p = 0.002; 95% CI = 3.7 to 13.6% MVIC). The results of this study show that performing exercise on the reverse fly machine with a neutral hand position significantly increases activity of the posterior deltoid and infraspinatus muscles compared to a pronated hand position.
Authors:
Brad Schoenfeld; R Gul Tiryaki Sonmez; Morey J Kolber; Bret Contreras; Robert Harris; Serife Ozen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-8
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-10     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:
1Lehman College, Bronx, NY 2AUT University, Aukland, NZ 3Nova Southeastern University, Ft. Lauderdale Florida 4Abant Izzet Baysal University, Bolu,Turkey.
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